| Ballistic Analysis of Electrothermal-Chemical (ETC) Propellant |
DEC 96 |
42 pages |
| Authors:
Gloria P. Wren; William F. Oberle; Sharon L. Richardson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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 | Firings performed under the alternate electrothermal-chemical (ETC) propellant materials contract with the Olin Corporation investigated a number of propellants using both conventional and plasma driven combustion. The objectives of this paper are to utilize the test series to examine: (1) ignition characteristics of plasma driven propellants; (2) pressurization rates of propellants under the influence of a plasma; (3) control of the gas generation rate in the gun with a plasma; ... |
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| Pulsed Power, Plasma, and Interior Ballistic Simulations for Application to Electrothermal-Chemical Guns |
MAR 96 |
40 pages |
| Authors:
Gary L. Katulka; William F. Oberle; Gloria P. Wren; Jeffrey Okamitsu; Neale A. Messina; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Recently the development of a PC-based, end to end electrothermal chemical (ETC) gun ballistic simulation code called the pulsed power plasma interior ballistics (PPIB) was completed. PPIB is a time dependent, lumped parameter, electrothermal chemical gun ballistic simulator which has a one dimensional plasma submodel. The PPIB code is used to simulate the three main subsystems of the overall ETC gun system, including the pulse power subsystem, the plasma cartridge, ... |
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| Electrothermal-Chemical Modeling Workshop, Held in Aberdeen Proving Ground, Maryland on 12-13 May 1993. Volume 1 |
MAY 94 |
295 pages |
| Authors:
Gloria P. Wren; William F. Oberle; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Electrothermal-Chemical (ETC) Extensions to IBHVG2 With a New User's Tutorial |
JAN 94 |
105 pages |
| Authors:
Jon Earnhart; Niels Winsor; Gloria P. Wren; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| IBHVG2, the computer code named for Interior Ballistics of High Velocity Guns, is a lumped parameter (zero dimensional) interior ballistics code which has been widely utilized to model solid propellant charges both nationally and internationally. Over the past 10 years a number of user options such as automated search routines and metric units have been added to the code. In this report we describe the extension of the code to ... |
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| Pressure Oscillations in a Regenerative Liquid Propellant Gun and Influence of Random Processes |
MAR 93 |
50 pages |
| Authors:
Gloria P. Wren; Paul S. Gough; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A one-dimensional model of the regenerative liquid propellant gun (RLPG) interior ballistic cycle has been developed in which the jet breakup and energy release is governed by a Taylor formulation. The model allows a random component in the jet breakup to simulate conditions which may exist in the gun. The random component produces rough combustion with energy being released in a nonuniform manner. The resulting chamber pressure history exhibits oscillations ... |
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| A Coupled Thermochemistry-Interior Ballistic Model and Application to Electrothermal-Chemical (ETC) Guns |
FEB 93 |
30 pages |
| Authors:
Gloria P. Wren; William F. Oberle; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In order to provide a more accurate description of the state of the propelling gas in electrothermal-chemical (ETC) gun simulations, the equilibrium thermochemical code BLAKE has been directly linked to a lumped parameter interior ballistics (IB) model and an inverse model. The inverse model utilizes experimental measurements of pressure, projectile position, and electrical energy input to infer the mass of propellant consumed at a timestep. In the linked models, computed ... |
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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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| An Inverse Analysis of Electrothermal-Chemical (ETC) Gun Experimental Data |
SEP 92 |
70 pages |
| Authors:
Gloria P. Wren; William F. Oberle; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An inverse analysis is presented as one method of assessing ballistic control exhibited in electrothermal-chemical (ETC) experimental gun firings. The analysis attempts to determine the decomposition or gas generation rate necessary to satisfy an energy balance equation as gleaned from available experimental data. The apparent functional relationship between the electrical energy input and working fluid mass consumed is examined. As applied in this report, the inverse analysis of ETC gun ... |
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| Burn Rates of LGP 1846 Conditioned Ambient, Hot, and Cold |
OCT 91 |
108 pages |
| 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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| Electrothermal-Chemical Modeling and Diagnostics Workshop. Volume 1 |
OCT 91 |
340 pages |
| Authors:
Gloria P. Wren; Sharon L. Richardson; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report contains the abstracts and viewgraphs of the papers presented at the JANNAF workshop on Electrothermal-Chemical Modeling and Diagnostics, 9-11 July 1991, held at the U.S. Army Ballistic Research Laboratory. Topics include: Diagnostic Measurements Desired by ETC Modeling Use of Diagnostic Measurements Desired by ETC Modeling (Plasmas); National Electric Gun Reviews and implications for the Army's ETC Gun Technology Program, Electrothermal Gun Demonstration Program, Navy BTI, program status; Electrothermal ... |
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| Electrothermal-Chemical Modeling and Diagnostics Workshop Held in Aberdeen Proving Ground, Maryland on 9-11 July 1991. Volume 2 |
OCT 91 |
417 pages |
| Authors:
Gloria P. Wren; Sharon L. Richardson; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report contains the abstracts and viewgraphs of the papers presented at the JANNAF workshop on Electrothermal-Chemical Modeling and Diagnostics, 9-11 July 1991, held at the U.S. Army Ballistic Research Laboratory. The topics include: Electrothermal Chemical Gun Program, Diagnostics Development of an Upwind/Implicit Computational Model for the Advancement of Army ETC Guns, 30-MM ETC Ballistic Diagnostic Facility, Numerical Simulation of the Interior Ballistic Processes in an ETC Gun, Finite-Element Modeling ... |
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| Jet Breakup and Combustion Modeling for the Regenerative Liquid Propellant Gun |
APR 91 |
52 pages |
| Authors:
Terence P. Coffee; Paul G. Baer; Walter F. Morrison; Gloria P. Wren; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Although interior ballistic models for the regenerative liquid propellant gun have been shown to be capable of accurately describing the mechanical response of the system, descriptions of the breakup and combustion of the liquid jet have proven less satisfactory. The propellant has been assumed to break into droplets whose diameters are functions of piston position or chamber pressure, and then combust according to a pressure-dependent burn rate law. This empirical ... |
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| A Comparison between Experiment and Simulation for Concept VIC regenerative Liquid Propellant Guns. 3. 155 mm |
SEP 90 |
130 pages |
| 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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| One-Dimensional Analysis of a Liquid Jet in a Regenerative Liquid Propellant Gun |
APR 90 |
65 pages |
| Authors:
Gloria P. Wren; Paul S. Gough; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In the regenerative liquid propellant gun (RLPG) a liquid monopropellant is injected by a moving piston in the form of an annular jet from a reservoir into a combustion chamber. Currently there are a number of lumped parameter models of the RLPG in use in the United States. However, the structure and spatial extension of the jet are not considered in any of these models. In this report the details ... |
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| A Comparison between Experiment and Simulation for Concept VIC regenerative Liquid Propellant Guns. 2. 105 mm |
APR 90 |
81 pages |
| Authors:
Terence P. Coffee; Gloria P. Wren; Walter F. Morrison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| 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 105 mm gun fixture. A previous report discussed the 30 mm gun fixture, and a future report ... |
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| Extension of a Model of Liquid Injection in a Regenerative Liquid Propellant Gun Based Upon Comparison with Experimental Results |
DEC 89 |
170 pages |
| Authors:
Gloria P. Wren; Walter F. Morrison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Experimental data currently collected for the regenerative liquid propellant gun (RLPG) in the injection region include liquid and chamber pressures and piston position. Utilizing this data, it has been possible to extrapolate liquid velocity and values for the discharge coefficient. However, models of the RLPG currently in use have required the discharge coefficient to be an input with liquid velocity determined based on steady Bernoulli flow. In an effort to ... |
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| A Comparison Between Experiment and Simulation for Concept VIC regenerative Liquid Propellant Guns. 1. 30 MM |
DEC 89 |
72 pages |
| Authors:
Terence P. Coffee; Gloria P. Wren; Walter F. Morrison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Regenerative liquid propellant gun (RLPG) technology is sufficient 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 30-mm gun fixture. Future reports will concentrate on the 105-mm and 155-mm guns. The Concept VIC gun design is described. ... |
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| A Model of Liquid Flow and Injection in a Regenerative Liquid Propellant Gun |
DEC 89 |
47 pages |
| Authors:
Walter F. Morrison; Gloria P. Wren; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A model of the liquid flow and injection in a regenerative liquid propellant gun is presented. This model is based on a generalization of the Lagrange model which is normally applied to the gas flow in a gun tube. Gradient equations are presented for the liquid velocity and pressure in the reservoir. Coupled equations of motion for the injection piston and liquid injection are then developed and applied to a ... |
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| Velocity and Pressure Distributions in the Liquid Reservoir in a Regenerative Liquid Propellant Gun |
SEP 88 |
37 pages |
| Authors:
Gloria P. Wren; Walter F. Morrison; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A number of models are now availa ble describing the ballistic process in a regenerative liquid propellant gun. These models have considered the performance of the regenerative liquid propellant gun system and demonstrated reasonable correlation with experimental results. Many details of the process are not well understood and have not been incorporated into the models. In an effort to describe one aspect of the system, the authors have developed a ... |
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| Parameters for Optimizing a Traveling Charge Gun System |
MAY 1988 |
49 pages |
| Authors:
William F. Oberle; Gloria P. Wren; Fred W. Robbins; Kevin J. White; Robert E. Tompkins; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The traveling charge(TC)concept is a solid propellant propulsion technique thought by ballisticians to offer the prospect of muzzle exit velocities in the 2-3 km/s range without the high breech pressures required of conventional gun propulsion systems. Previous work has demonstrated that the XNOVAKTC computer code is a reliable tool for simulating TC gun firings when compared to experimental results and it was felt that the code could be used to ... |
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| 120-mm Regenerative Liquid Propellant Gun: A Parametric Investigation of the Interior Ballistics |
AUG 87 |
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| Authors:
Gloria P. Wren; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
 | A sensitivity study of a 120-mm regenerative liquid propellant gun was completed to explore the relationships between the variables as expressed in the interior ballistic code developed by T. Coffee at the Ballistic Research Laboratory. Parametric runs were conducted by varying an array of input parameters by +-10% and +-20%, and the effects on performance characteristics were recorded. In the second phase of the study a constraint of maximum liquid ... |
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| A Model of Liquid Injection in a Regenerative Liquid Propellant Gun |
JUL 87 |
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| Authors:
Walter F. Morrison; Gloria P. Wren; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A lumped parameter model of liquid injection in a regenerative liquid propellant gun is developed. A set of ordinary differential equations is presented which account for (1) the coupling between piston motion and liquid injection and (2) the inertia of the liquid in the reservoir. Results of the simulation are presented and compared to experimental data from a 30-mm RLPG test fixture. |
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Reports by Author
