| Mortar Interior Ballistics: Sensitivity Studies Using IBHVG2 and Progress Toward a Multidimensional Representation |
Jun-2009 |
38 pages |
| Authors:
John R Schmidt; Michael J Nusca; Albert W Horst; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
 | Traditionally, the interior ballistic (IB) modeling of mortars has been difficult to achieve because a mortar projectile contains certain energetic components internal to the tail boom. After ignition, high pressure generated by the igniter causes the canister to burst and release hot gases and burning particles into the larger chamber called the launch tube. Subsequently, any external charges ignite and produce gases which accelerate the projectile. A recent advancement to ... |
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| Influence of Pulse Length on Electrothermal Plasma Jet Impingement Flow |
DEC 2007 |
26 pages |
| Authors:
Lang-Mann Chang; Stephen L. Howard; AMERICAN SYSTEMS CORP CHANTILLY VA
|
| An experimental investigation has been performed to gain insight into the flows resulting from a plasma jet impinging on a flat plate at representative incident angles of 90 degrees, 60 degrees, and 45 degrees in the open air for two plasma pulse lengths (~0.3 and 1.0 ms). Specifically, the investigation examined the influence of the pulse length on the flow characteristics that may affect the plasma propellant interactions occurring in ... |
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| Characterization of Two 12-mm Primers - the M129 and M125 |
DEC 2007 |
34 pages |
| Authors:
Stephen L. Howard; Anthony W. Williams; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Increased precision/lethality of large-caliber weapons has been a goal of many for a number of years. Different (more energetic propellant compositions and configurations have provided much of the increases in performance. However, ever-increasing loading densities and the goal of more insensitive propellants translate to the need for ignition systems that are optimized for the propelling charge. Without such optimization, pressure waves can increase, thus endangering the gun and crew, or ... |
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| Effects of Corona, Spark and Surface Discharges on Ignition Delay and Deflagration-to-Detonation Times in Pulsed Detonation Engines (Postprint) |
DEC 2006 |
12 pages |
| Authors:
Kenneth Busby; Jennifer Corrigan; Sheng-Tao Yu; Skip Williams; Campbell Carter; Frederick Schauer; John Hoke; Charles Cathey; Martin Gundersen; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| The purpose of the research described herein is to compare the ignition delays in an experimental pulsed detonation engine produced by thermal and non-thermal ignitions. The commercial thermal ignition has a pulse duration of about 1 microsec, whereas the non-thermal ignitions have pulse durations of 100 nanosec. Ignition delay is an important factor, along with fill and purge times, that limit the maximum repetition rate and thrust of pulsed detonation ... |
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| Performance of a Diesel, JP-8 Reformer |
27-Nov-2006 |
5 pages |
| Authors:
Subir Roychoudhury; Dennis Walsh; Deryn Chu; Erik Kallio; PRECISION COMBUSTION INC NORTH HAVEN CT
|
| Under a U. S. Army program, Precision Combustion, Inc. (PCI) has developed and demonstrated an ultra compact and lightweight 2 - 5 kWe diesel reformer and desulfurizer producing 1 ppm sulfur in reformate. The prototype includes a steam generator, fuel/air/water pumps, premixer, atomizer, igniter, sulfur cleanup and a controller to enable stand-alone operation. The reforming reactor was based on a small, modular catalytic reactor, which utilized patented Microlith substrates and ... |
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| Cavity-Based Injector Mixing Experiments for Supersonic Combustors With Implications on Igniter Placement (Postprint) |
OCT 2006 |
15 pages |
| Authors:
Lance S. Jacobsen; Campbell D. Carter; Andrew C. Dwenger; GOHYPERSONIC INC (GHI) DAYTON OH
|
| Mixing experiments using simultaneous acetone and NO PLIF were performed in the AFRL/PRA Test-cell 19 supersonic wind tunnel. These experiments investigated the influence of simulated plasma-torch placement in an injector-cavity configuration exposed to a supersonic crossflow. Both the simulated plasma torch and fuel injector holes injected room temperature air, respectively seeded with acetone and nitric oxide (NO). Experiments at the streamwise centerline of the rectangular wind tunnel investigated the differences ... |
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| A Novel Distributed Ignition Method Using Single-Wall Carbon Nanotubes (SWCNTS) and a Low-Power Flash Light (Preprint) |
SEP 2006 |
9 pages |
| Authors:
B. Chehroudi; S. A. Danczyk; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| This paper describes a low-power novel ignition method that uses the energy of a single exposure of an ordinary camera flash and SWCNTs to ignite various fuels. It is shown that this method is able to ignite solid, liquid, and gaseous fuels. The effects of the iron (Fe) nanoparticles (embedded in the SWCNTs) concentration on the ignition process have been studied. One application of this nano-technology based ignition method has ... |
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| Progress in the Development of a Multiphase Turbulent Model of the Gas/Particle Flow in a Small-Caliber Ammunition Primer |
AUG 2006 |
44 pages |
| Authors:
John R. Schmidt; Michael J. Nusca; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| There is significant experimental evidence that burning particles of various chemical compositions and sizes are ejected from gun primers and that these particles interact with the propellant grains during main charge ignition. This explicit ignition phenomenon is thought to be incompatible with the implicit treatment of primer function in conventional interior ballistics codes and models. Generally, the primer efflux is treated as a hot gas that evolves from a specified ... |
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| IBHVG2: Mortar Simulation With Interior Propellant Canister |
MAR 2006 |
73 pages |
| Authors:
Ronald D. Anderson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A method has been implemented for the Interior Ballistics of High Velocity Guns, Version 2 (IBHVG2) simulation program to model mortar systems, including an enclosed high-pressure igniter canister. The application allows initial pressurization of the canister until interior pressure reaches a force high enough to rupture a burst diaphragm. Combustion gases are then released to the larger (main) chamber to accelerate the projectile or to ignite additional propellant for the ... |
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| Generation and Study of Microwave Plasma Jets |
28 SEP 2005 |
19 pages |
| Authors:
Kuo; POLYTECHNIC UNIV BROOKLYN NY
|
| The present report summarizes the work, under the support of the AFOSR Grant AFOSR-FA9550-O4-l-0352, starting at May 1, 2004. This research program is primarily aiming at developing plasma torches as igniters of a scramjet engine. For the hydrocarbon-fueled scramjet in a typical startup scenario, cold liquid JP-7 is injected into a Mach-2 air crossflow (having a static temperature of - 500 K); under these conditions, the fuel-air mixture will not ... |
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| Meso and Micro Scale Propulsion Concepts for Small Spacecraft |
14 JUN 2005 |
26 pages |
| Authors:
R. A. Yetter; V. Yang; I. A. Aksay; F. L. Dryer; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL AND NUCLEAR ENGINEERING
|
| A meso/micro scale liquid propellant thruster is being developed for small spacecraft. In this thruster, the liquid propellant was injected directly into the chamber tangentially along the combustor wall. Heat feedback from the flame, once ignited, decomposed and gasified the liquid propellant. The gasification process of the propellant produced a voflex flow in the combustor, which stabilized the gas- phase flame. Modeling studies with gas-phase injection of reactants have shown ... |
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| Multispecies Reacting Flow Model for the Plasma Efflux of an ETC Igniter - Application to an Open-Air Plasma Jet Impinging on an Instrumented Probe |
JUL 2004 |
30 pages |
| Authors:
Michael J. Nusca; William R. Anderson; Michael J. McQuaid; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The U.S. Army Research Laboratory (ARL) is investigating the electrothermal-chemical (ETC) gun concept. As part of this program, ARL has recently begun a comprehensive study on the interaction of the plasma efflux from an ETC igniter with solid propellant grains. The goal of this work is to elucidate the relevant physical, mechanical, and chemical mechanisms that underlie the observed ballistic effects in ETC guns that can lead to useful performance ... |
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| Experimental Study of Plasma/Propellant Interactions |
23 APR 2004 |
30 pages |
| Authors:
Stefan T. Thynell; Thomas A. Litzinger; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL AND NUCLEAR ENGINEERING
|
| The overall objective of the project was to improve our understanding of the various chemical and physical processes that occur during ignition by the plasma igniter. During the project period, electrical circuits, experimental setups were designed and manufactured, as well as data acquisition systems were acquired. The following primary findings have been obtained from this project: 1) to achieve ignition, a closed chamber configuration is needed, 2) JA2 propellant is ... |
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| A Study of Window Focusing Effects on Laser Ignition for Medium-Caliber Systems |
MAY 2002 |
34 pages |
| Authors:
Jeffrey B. Morris; Richard A. Beyer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| One proposed implementation of medium-caliber laser ignition em ploys a focusing ball to replace the conventional electric primer. The effects of ball size and igniter stand-off distance have been characterized experimentally with black powder pellets. Ignition threshold and delay experiments were carried out using 4 mm and 6 mm diameter glass beads with standoffs up to 1.5 mm. Ray tracing was used to model the energy distribution of a top-hat ... |
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| Solid Propellant Test Motor Scaling |
SEP 2001 |
|
| Authors:
Ronald S. Fry; CHEMICAL PROPULSION INFORMATION AGENCY COLUMBIA MD
|
 | Current burning rate measurement test techniques and subscale test hardware used within the NATO community are reviewed and recommendations are made to support improved scaling and prediction of internal ballistics of a full-scale solid propellant motor. The NATO Research and Technology Organization (RTO), Advanced Vehicle Technology (AVT), Working Group (WG) 016 (formerly AGARD/PEP Working Group #27) undertook to evaluate methods used within the NATO propulsion community to measure burning rate ... |
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| Analysis of Burning Rate Phenomena and Extinguished Solid Propellants From an Interrupted Closed Bomb with Plasma Igniter |
AUG 2001 |
42 pages |
| Authors:
Robert J. Lieb; Pamela J. Kaste; Aviezer Birk; Michael A. Schroder; Micguel A. Del Guercio; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Interrupted closed-bomb analyses of M30 and JA2 propellants have been performed with the goal of understanding the phenomena responsible for the apparent augmentation of closed-bomb burning rates when plasma, rather than black powder, ignition is used. Burning rates of the propellants during plasma injection and after the plasma (to blowout pressures of 100 MPa) have been estimated from the grain regression measurements and the P-t traces. characterization of the extinguished ... |
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| Experimental Study of Plasma-Propellant Interactions |
19 JUN 2001 |
4 pages |
| Authors:
Stefan T. Thynell; Thomas A. Litzinger; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL AND NUCLEAR ENGINEERING
|
| The use of a plasma as an ignition source has revealed several attractive benefits over conventional igniter systems, such as a shorter ignition delay, reduced temperature sensitivity of the propellant, better controlled propellant mass generation rates, and reduced susceptibility to anomalous ignition transients. However, the causes of these attractive benefits at a fundamental level are not well understood. To address the issues in this experimental program, different diagnostic tools are ... |
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| Combustion Coupled Flow Dynamics in Solid Rocket Motors |
30 MAY 2001 |
39 pages |
| Authors:
D. R. Kassoy; COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING
|
| The literature on pulse detonation engine (PDE) and pulse detonation rocket engine (PDRE) modeling and experiments has been reviewed with the goal of determining characteristic operational time and length scales, key parameter ranges and approaches used for evaluating device efficiency. The roles of igniter power level, duration and location on the initiation of a detonation has been assessed for gaseous mixture systems and those based on multiphase sprays. A secondary ... |
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| Micropropulsion Research at AFRL |
03 MAY 2000 |
13 pages |
| Authors:
Frank S. Gulczinski III; Gregory G. Spanjers; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| There is an increased requirement for microsatellites to support such future missions as formation-flying space-based surveillance, space control, and on-orbit satellite servicing. Devices that can provide precise impulse bits in the 10-micro newton range may be enabling for a new fleet of 25-kg class spacecraft supporting these missions. in response to this need the Air Force Research Laboratory is developing a miniaturized propulsion unit: the Micro- Pulsed Plasma Thruster (Micro-PPT). ... |
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| Development of an Electronically-Controlled Smoke Pot Aerosol Dispenser |
2000 |
15 pages |
| Authors:
Daniel J. Hartman; Noel Gonzalez; William G. Rouse; Raymond Malecki; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| Engineering Technology, Inc. (ETI) and the U.S. Army Edgewood Chemical and Biological Center (ECBC) have completed the technology application demonstration of a general-purpose Smoke Pot having an electronic controller. The smoke pot employs propellant-based aerosol dissemination technology to expel obscurant materials. A patent is currently pending for this dissemination technology. The smoke screen produced by this device is effective in the visual (VIS), infrared (IR) or millimeter (MM) radar spectrum. ... |
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| Effectiveness of Ferrite Cable for Pyrotechnic Training Simulator Applications |
AUG 1999 |
17 pages |
| Authors:
Gregory S. Mannix; Wai T. Lee; Derrick Coppin; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ WARHEADS ENERGETICS AND COMBAT SUP
|
| Electrically initiated pyrotechnic training simulators fielded in training operations are exposed to severe electromagnetic radiation environments; which with a growing reliance on the frequency spectrum, are expected to increase in severity. Unfortunately, beyond intended purpose, this electromagnetic radiation energy behaves as an ignition stimuli for electrically initiated pyrotechnic simulators using commercially produced bridge wire electric match igniters. In the configuration where the ignition cable ... |
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| The Micro Pulsed Plasma Thruster |
11 MAY 1999 |
|
| Authors:
Gregory G. Spanjers; John H. Schilling; Scott Engelman; Ronald A. Spores; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| There is an increased requirement for microsatellites to support such future missions as formation-flying space-based radar, space control, and on- orbit satellite servicing. Devices that can provide precise impulse bit in the 10 micro Newton range may be enabling for a new fleet of 25-kg class spacecraft supporting these missions. In response to this need the Air Force Research Laboratory is developing a miniaturized propulsion unit: the Micro Pulsed Plasma ... |
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| Modeling Primary Atomization Processes |
01 FEB 1999 |
127 pages |
| Authors:
Stephen D. Heister; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
|
| The contributions of atomization processes to combustion instabilities in liquid rocket engines has been assessed via a series of analytic/numerical models. Simulations of high-speed injection of a viscous jet have revealed a jet "swelling" phenomenon for the first time. Modeling of F-1 fuel injectors reveals a potential instability of the fuel columns to transverse acoustic modes in injector designs which showed large instabilities. Limited ... |
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| Investigation of Bulk-Loaded Liquid Propellant Gun Concepts |
SEP 97 |
127 pages |
| Authors:
Robert L. Talley; John Owczarczak; Matthew Geise; VERITAY TECHNOLOGY INC EAST AMHERST NY
|
| The approach of using chamber geometry (in the forms of stepped-wall and multichambers) in conjunction with using a repeatable igniter was investigated as a means for controlling the interior ballistic variability in 20-mm and 30-mm bulk-loaded liquid propellant guns (BLPGs). Full-scale, gun firing tests were conducted using the liquid monopropellant XM46 to experimentally develop a database for assessing the utility of these mechanical control concepts. The 3O-mm gun test data ... |
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| Plasma Characterization for Electrothermal-Chemical (ETC) Gun Applications |
SEP 97 |
50 pages |
| Authors:
Kevin J. White; Gary L. Katulka; Thuan Khong; Kevin Nekula; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Successful application of the electrothermal chemical (ETC) propulsion concept will require an understanding of the propagation and interaction of plasmas in propellant beds. This information is necessary to exploit the ignition and combustion control that is possible with plasmas. Toward this end, an experimental program was designed to gain an understanding of the functioning of the plasma and the interaction of the plasma with the propelling charge, and family a ... |
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| Design and Construction of a Thermophotovoltaic Energy Conversion System Using Combustion Gases from a T-58 Gas Turbine |
07 MAY 1997 |
92 pages |
| Authors:
Timothy A. Erickson; NAVAL ACADEMY ANNAPOLIS MD
|
| An ongoing project at the U.S. Naval Academy involves the development of a prototype ThermoPhotovoltaic (TPV) generator that uses a General Electric T-58 gas turbine as the heat source. The combustion gas was tapped from the T- 58's combustor through an ignitor port and then extracted through a silicon carbide composite tube into a ceramic emitter. The emitter was also made from the same silicon carbide composite. The TPV generator ... |
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| Hydrodynamic Breech Window Design Concept for Laser Ignition of Large- Caliber Guns |
JUN 96 |
54 pages |
| Authors:
Stephen L. Howard; Lang-Mann Chang; John Grosh; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Laser ignition is becoming a viable method of igniting a propellant bed (especially for large-caliber guns). However, problems still are present at the optical interface of the laser and the round to be fired. The most obvious problem to the casual observer is the deposits left on the window from the ignition of the igniter material and propellant. If the window is obscured (by an opaque coating or by opaque ... |
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| High-Mass Launch Capability Development for the U.S. Army Research Laboratory's 5O-mm High-Pressure Powder Gun (Range 3O9A) |
APR 96 |
97 pages |
| Authors:
Graham F. Silsby; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Documented here are improvements to the 50-mm high-pressure powder gun system in the U.S. Army Research Laboratory's (ARL's) terminal ballistic Range 309A. It was designed for high velocity, achieved by large charge-to-mass (C-M) ratios and a long navel (120 calibers). The goal here was to maximize performance with C-M ratios near 1. This was achieved by a series of incremental improvements to gun and sabot hardware and to priming and ... |
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| Design and Component Integration of a T63-A-700 Gas Turbine Engine Test Facility |
SEP 95 |
175 pages |
| Authors:
Brian P. Eckerle; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A gas turbine engine test cell was developed integrating an Allison T63-A-700 helicopter engine with a superflow water brake dynamometer power absorber. Design specifications were set on all systems and subsystems necessary to operate the engine. Preliminary and detailed designs of the air, water, fuel, and oil systems were developed producing a construction ready overall design. Performance predictions were made which will be compared to experimental data obtained from system ... |
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| Test Results from a 37-mm Segmented-Chamber Bulk-Loaded Liquid Propellant Gun |
SEP 95 |
50 pages |
| Authors:
T. E. Rosenberger; I. C. Stobie; J. D. Knapton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A program was initiated at the U.S. Army Research Laboratory (ARL) to investigate the use of segmented- chamber configurations to control the ballistic variability in bulk-loaded liquid propellant guns (BLPG). A series of gun firings was performed in a 37-mm BLPG using OTTO II monopropellant. Results of these tests indicated that a radial igniter and solid propellant booster with various segmented-chamber concepts are favorable in controlling the combustion evolution and ... |
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| Enhancement of Semiconductor Bridge Initiators for Ignition of Large- Caliber Ammunition |
JUN 95 |
36 pages |
| Authors:
Stephen L. Howard; Lang-Mann Chang; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Semiconductor bridge initiators (SCBI) have been proposed as a means of initiating the ballistic cycle in large-caliber ammunition. However, an ignition delay of more than 10 ms for a black powder basepad was not acceptable for multicomponent tank ammunition. Enhancement of the output from the SCBI was needed to reduce the ignition delay to acceptable levels. Early experiments in a small-caliber ammunition simulator suggested that if the energetic igniter material ... |
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| Laser Ignition of Explosives, Pyrotechnics and Propellants: A Review |
MAY 95 |
|
| Authors:
Leo De Yong; Tam Nguyen; John Waschl; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| This review critically examines the current state of technology of laser ignition of explosives pyrotechnics and propellants. It presents the approaches used for each energetic material, looks at the materials tested, the results obtained and the potential for future development of in-service laser initiated ordnance. It has been concluded that the only possible approach to laser initiation of explosives in a fuze is via a laser driven flyer plate but ... |
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| Laser Ignition Testing of Two-Piece Tank Ammunition for Advanced Tank Cannon System (ATACS) |
JUL 94 |
35 pages |
| Authors:
Austin W. Barrows; Brad E. Forch; Lang M. Chang; Stephen L. Howard; Richard A. Beyer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In this paper, new results on the development of a laser-based ignition system for ATACS will be presented. Full scale testing of a multipoint ignition system in a large caliber gun ballistics simulator are in progress. A Nd:Glass laser is used to initiate a vented igniter tube containing blackpowder at multiple locations and a booster charge of blackpowder at the interface. The results of pressure-time data and high-speed photography show ... |
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| Performance Oriented Packaging Testing of JATO Ignitor Wood Box for Packing Group II Solid Hazardous Materials |
JUL 93 |
7 pages |
| Authors:
P. W. Guppenberger; NAVAL SURFACE WARFARE CENTER CRANE DIV IN
|
| This Performance Oriented Packaging (POP) test was conducted to ascertain whether the JATO Igniter Wood Box (Drawing 3361AS100) meets the Packing Group 11 requirements specified by the Code of Federal Regulations, Title 49 CFR, Parts 106 through 178, dated 1 October 1992. The packaged commodity used for the test were eight simulated JATO igniters, each weighing 4. 5 kg (10 pounds). This represents the current maximum commodity weight. Gross weight ... |
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| Flamespreading in Granular Solid Propellant: Design of an Experiment |
JUN 93 |
38 pages |
| Authors:
Douglas E. Kooker; Lang-Mann Chang; Stephen L. Howard; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| When flamespreading in a gun system is rapid and reproducible, there is little incentive to improve our fundamental understanding of the ignition and flamespreading process. However, low-vulnerability (LOVA) propellants which are deliberately difficult to ignition can sometimes lead to anomalous ignition and flamespreading behavior. The present investigation is an attempt to study the fundamental behavior in a packed bed of granular gun propellant with a laboratory simulator. The apparatus consists ... |
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| Influence of Ignition Related Parameters and Charge Configuration on XKTC Model Predictions |
JUN 93 |
|
| Authors:
Anna E. Wildegger-Gaissmaier; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
|
| A parametric study has been conducted to assess the influence of ignition related parameters and charge configurations on model predictions using the one-dimensional two-phase flow interior ballistics code XKTC. The investigation showed that the code is sensitive to charge configuration parameters such as bed porosity and ullage, and their effect on compression wave speed. Minimisation of ullage and maximisation of bed porosity reduce the probability of damaging pressure waves. Substantial ... |
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| Laser Ignition in Guns, Howitzers and Tanks: The LIGHT Program |
FEB 93 |
41 pages |
| Authors:
Austin W. Barrows; Brad E. Forch; Richard A. Beyer; Arthur Cohen; Joyce E. Newberry; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Recent advances in large-caliber gun propulsion systems have exacerbated the problems associated with reproducible and reliable ignition. The use of liquid propellant in the Advanced Field Artillery System (AFAS) 155-mm howitzer, multicomponent Unicharge in 155-mm howitzers and two-piece ammunition in the Advanced Tank Cannon System (ATACS) 140-mm tank gun introduce new constraints on the ability of conventional primers and igniter materials to achieve reliable ignition. In response to these challenges ... |
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| Utilization of Electrical Energy to Enhance Performance of Solid Propellant Guns |
DEC 92 |
40 pages |
| Authors:
Gloria P. Wren; William F. Oberle; Walter F. Morrison; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Although the ETC propulsion system is often implemented with a novel propellant formulation to exploit the potential for high volumetric energy density and low molecular weight products, the introduction of an electrically generated plasma into a solid propellant has been proposed and, in fact, initially tested. Proponents of introducing plasma energy into the breech of a traditional solid propellant gun expect the plasma to serve two functions: perform as the ... |
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| Simulation of Ballistic Phenomena in Conceptual Two-Piece Ammunition |
JUL 92 |
77 pages |
| Authors:
Lang-Mann Chang; Frederick W. Robbins; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Numerical simulations which examine the ballistic effects of charge configuration, location of igniter output, and interface characteristics in a conceptual two-piece cartridge are presented. The focus of this study is on the occurrence of high-amplitude pressure waves associated with these variables. Results show that all-stick charge configuration is the most forgiving system which alloys a wide variety of igniter output arrangement without causing pressure wave concern. Uniform ignition along the ... |
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| High Temperature Rectifiers and MOS Devices in 6H-Silicon Carbide |
27 APR 92 |
|
| Authors:
J. W. Palmour; J. A. Edmond; C. H. Carter Jr; CREE RESEARCH INC DURHAM NC
|
| A major emphasis in the aerospace industry has been to increase the performance and efficiency of aircraft engines (including helicopters). Most of the improvements require the engine to run hotter, be more compact and more precisely controlled. All of these requirements increase the temperature of an increasing number of electronic components on the engine. This contract involved the development of two types of solid state devices for use in various ... |
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| Sensitivity of Muzzle Velocity Repeatability to Variations in Initial Conditions |
MAR 92 |
26 pages |
| Authors:
C. Watson; J. D. Knapton; N. Boyer; I. C. Stoble; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Interior ballistic data from 20 tests with a 30-mm regenerative liquid propellant gun (RLPG) are examined. The tests are divided into four groups, with five tests in each group. The particular RLPG, referred to as Concept VI, is based on an annular-sheet-type of injector. The propellants used for the tests were liquid gun propellant (LGP) 1845 and LGP 1846. The mean muzzle velocity and the standard deviation for the first ... |
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| Identification of Ignition Criteria for Low Vulnerability Propellants |
31 DEC 1991 |
64 pages |
| Authors:
James T. Barnes; Edward B. Fisher; VERITAY TECHNOLOGY INC EAST AMHERST NY
|
| This project involved three phases: measuring the heat and pressure generated by various igniter systems, evaluation of the ability of these systems to ignite Lova in a closed bomb, and finally, sampling and analysis of the low pressure combustion products of Lova propellant. The primary goal of this work was to develop a diagnostic methodology to design and evaluate igniter materials for Lova propellants. To measure the heat output and ... |
|
| Combustible Metallic Igniter Casing for Tank Guns |
NOV 91 |
|
| Authors:
F. W. Robbins; M. L. Bundy; R. Von Wahlde; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Calculations have shown that a combustible metallic igniter casing for tank cannon can be made to withstand the pressure loads created by combustion of the igniter charge, yet - when consumed by the flame of the main charge - not adversely elevate the maximum chamber pressure at any position. In particular, a finite-element model, I-DES, was used to evaluate the structural response of various combustible igniter casings when subjected to ... |
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| Experimental Measurement of Tailboom Strain During Charge Ignition |
OCT 91 |
|
| Authors:
Joseph W. Colburn; Arthur A. Koszoru; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The evolution of Armor Piercing Fin Stabilized Discarding Sabot (APFSDS) projectiles has lead to projectiles which protrude substantially into the gun chamber, affecting igniter design, path of flamespread through the charge, and projectile loading. This study focuses on a method of detecting loading of the projectile tailboom during the early phase of the interior ballistic cycle. Using a clear acrylic gun chamber simulator with an instrumented projectile, charge ignition and ... |
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| Burn Rates of LGP 1846 Conditioned Ambient, Hot, and Cold |
OCT 91 |
|
| Authors:
William F. Oberle; Gloria P. Wren; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The liquid gun propellant LGP 1846, is being used by the U.S. Army in the development of a regenerative liquid propellant gun (RLPG) for use with the next generation artillery howitzer. Results of closed chamber experiments using LGP 1846 are presented. The matrix of firings includes variations in igniter pressure, propellant loading density, and temperature conditioning of the propellant, ranging from approximately -25 C to +60 C. Derived burning rate ... |
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| Pyrofuze Pin for Ordnance Activation. |
06 AUG 1991 |
|
| Authors:
James M. Schaff; Amos J. Diede; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| This patent discloses an electrically controllable 'Pyrofuze' pin device for ordnance device activation which functionally replaces the mechanical barrier and arming wire or other rigid and removable means used to provide ordnance device activation. The device includes a 'Pyrofuze' pin, a connecting ignitor transfer charge, and ignitor, and electrical terminals to provide power from an external power supply, and a weatherproofing housing. When electrically activated, the Pyrofuze pin is reduced ... |
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| Aerial Flare and Igniter. |
02 APR 1991 |
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| Authors:
Stanley J. Herold; Charles D. Howard; Donald E. LaGrange; DEPARTMENT OF THE NAVY WASHINGTON DC
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| This patent discloses an illuminating flare which has an igniter in which a two-part inertial mass is guided for relative aftward movement from a safe position to an armed position under launching forces. One part of the mass undergoes relative forward movement to an ignition position under parachute-opening, deceleration forces while the other part of the mass is restrained from moving as far forward as the first part. This separation ... |
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| Two-Stage Igniter Test Results: Electrical Ignition of LGP 1846 |
APR 91 |
26 pages |
| Authors:
James DeSpirito; G. P. Reeves; John D. Knapton; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Test results from a two-stage, electrical liquid propellant igniter are described. Two critical areas are identified relating to the operation of the igniter. The first is the confinement of the liquid propellant in the ignition cavity and the second is the interaction of the gases venting from the precombustion chamber with the liquid propellant booster charge in the antechamber. The design modifications made to ensure proper operation are presented. Typical ... |
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| The Development of an Igniter for Plastic Thermite |
NOV 90 |
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| Authors:
Leo De Yong; Mike Wilson; Brian Whiffen; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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| A pyrotechnic igniter has been developed to reliably initiate a pliable termite composition, plastic thermite. The igniter is electrically initiated and includes a single priming increment directly pressed onto the main composition. This simplicity makes manufacture easy and increases reliability by reducing the number of interfaces which are common failure sites. The igniter successfully completed assessment of both its ignition performance and design integrity after preliminary ISAT B and bump ... |
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| A Comparison between Experiment and Simulation for Concept VIC regenerative Liquid Propellant Guns. 3. 155 mm |
SEP 90 |
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| Authors:
Gloria P. Wren; Terence P. Coffee; Walter F. Morrison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Regenerative liquid propellant gun (RLPG) technology is sufficiently mature to allow the testing of the first 155 mm liquid propellant gun. In support of the development of this artillery weapon, test fixtures in 30 mm and 105 mm sizes have been built and fired. This report describes the analysis and modeling of the 155 mm gun fixture labeled Gun 1, an experimental fixture planned as the forerunner of the final ... |
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Reports by Keyword(s)
IGNITERS
