Dynamic Inlet Distortion Prediction with a Combined Computational Fluid Dynamics and Distortion Synthesis Approach

Norby, W. P. and Ladd, J. A. and Yuhas, A. J. (1996) Dynamic Inlet Distortion Prediction with a Combined Computational Fluid Dynamics and Distortion Synthesis Approach. Technical Report NASA CR-198053, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

A procedure has been developed for predicting peak dynamic inlet distortion. This procedure combines Computational Fluid Dynamics (CFD) and distortion synthesis analysis to obtain a prediction of peak dynamic distortion intensity and the associated instantaneous total pressure pattern. A prediction of the steady state total pressure pattern at the Aerodynamic Interface Plane is first obtained using an appropriate CFD flow solver. A corresponding inlet turbulence pattern is obtained from the CFD solution via a correlation linking root mean square (RMS) inlet turbulence to a formulation of several CFD parameters representative of flow turbulence intensity. This correlation was derived using flight data obtained from the NASA High Alpha Research Vehicle flight test program and several CFD solutions at conditions matching the flight test data. A distortion synthesis analysis is then performed on the predicted steady state total pressure and RMS turbulence patterns to yield a predicted value of dynamic distortion intensity and the associated instantaneous total pressure pattern.

EPrint Type:	NASA Contractor Report
Keywords:	Computational fluid dynamics, Distortion synthesis, Dynamic distortion, F/A-18 airplane, Inlet, Inlet distortion
Subjects:	Aircraft/Project: F-18 HARV (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power
ID Code:	211
Deposited On:	16 July 2004
Additional Information:	37 pages. Errata on cover, title and RDP pages. Dryden Technical Monitor: Kevin Walsh. W.P. Norby and J.A. Ladd, McDonnell Douglas Aerospace, St. Louis, Missouri, and A.J. Yuhas, AS&M, Inc., Hampton, Virginia. Presented at the High-Angle-of-Attack Technology Conference, NASA Langley Research Center, Hampton, Virginia, Sept. 17–19, 1996.