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Modeling of Fixed-Exit Porous Bleed SystemsA model has been developed to simulate a fixed-exit porous bleed system for supersonic inlets. The fixed-exit model allows the amount of bleed flow to vary according to local flow conditions and fixed-exit characteristics of the bleed system. This variation is important for the control of shock-wave/boundary-layer interactions within the inlet. The model computes the bleed plenum static pressure rather than requiring its specification. The model was implemented in the Wind-US computational fluid dynamics code. The model was then verified and validated against experimental data for bleed on a flat plate with and without an impinging oblique shock and for bleed in a Mach 3.0 axisymmetric, mixed-compression inlet. The model was able to accurately correlate the plenum pressures with bleed rates and simulate the effect of the bleed on the downstream boundary layer. Further, the model provided a realistic simulation of the initiation of inlet unstart. The results provide the most in-depth examination to date of bleed models for use in the simulation of supersonic inlets. The results also highlight the limitations of the models and aspects that require further research.
Document ID
20080022430
Document Type
Technical Memorandum (TM)
Authors
Slater, John W.
(NASA Glenn Research Center Cleveland, OH, United States)
Saunders, John D.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
May 1, 2008
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
E-16423
NASA/TM-2008-215178
AIAA Paper 2008-0094
Meeting Information
Meeting: 46th AIAA Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 7, 2008
End Date: January 10, 2008
Funding Number(s)
WBS: WBS 561581.02.10.03.32
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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