| Highly Loaded Low-Pressure Turbine: Design, Numerical and Experimental Analysis (Preprint) |
Jun 2010 |
16 pages |
| Authors:
J P Clark; P J Koch; S L Puterbaugh; J T Schmitz; S C Morris; R Ma; T C Corke; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE BRANCH
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 | The performance and detailed flow physics of a highly loaded, transonic, low-pressure turbine stage has been investigated numerically and experimentally. The mean rotor Zweifel coefficient was 1.35, with a work coefficient of 2.8, and a total pressure ratio of 1.75. The aerodynamic design was based on recent developments in boundary layer transition modeling. Steady and unsteady numerical solutions were used to design the blade geometry as well as to predict ... |
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| Polyhedral Oligomeric Silsesquioxane (POSS) Polyimides as Space-Survivable Materials (Preprint) |
27 JUL 2006 |
13 pages |
| Authors:
Sandra J. Tomczak; Vandana Vij; Darrell Marchant; Timothy K. Minton; Amy L. Brunsvold; Michael El Wright; Brian J. Petteys; Andrew J. Guenthner; Gregory R. Yandek; Joe Mabry; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE BRANCH
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| Polyimides (PIs) such as Kapton(R) are used extensively in spacecraft thermal blankets, solar arrays, and space inflatable structures. Atomic oxygen (AO) in low Earth orbit (LEO) causes severe degradation of Kapton(R). SiO(sub 2) coatings impart remarkable oxidation resistance and have been widely used to protect Kapton(R), yet imperfections in the SiO(sub 2) application process and micrometeoroid/debris impact in orbit damage the SiO(sub 2) coating leading to Kapton(R) erosion. A polyimide ... |
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| Validation of Heat-Flux Predictions on the Outer Air Seal of a Transonic Turbine Blade (Preprint) |
JUN 2006 |
20 pages |
| Authors:
John P. Clark; Marc D. Polanka; Matthew Meininger; Thomas J. Praisner; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE BRANCH
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| It is desirable to predict accurately the heat load on turbine hot section components within the design cycle of the engine. So, a set of predictions of the heat flux on the Blade Outer Air Seal (BOAS) of a transonic turbine is here validated with time-resolved measurements obtained in a single-stage high pressure turbine rig. Surface pressure measurements were also obtained along the blade outer air seal, and these are ... |
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| A Large-Scale Investigation of a Flat-Plate Pulsed Vortex Generator Jet in Crossflow Using PIV |
JUL 2005 |
13 pages |
| Authors:
Marc Polanka; Rolf Sondergaard; Kenneth Moore; Mitch Wolff; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH TURBINE BRANCH
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| The use of small jets of air has proved to be an effective means of flow control on low Reynolds number turbine blades. Pulsing of these jets has also shown benefits in reducing the amount of air needed to achieve the same level of flow control. An experiment using Particle Image Velocimetry (PIV) has been set up to investigate how these pulsed jets interact with the boundary layer to help ... |
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