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Ultra High Bypass Nacelle Aerodynamics Inlet Flow Through High Angle Of Attack Distortion Test
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722851736 Total Pages :74 pages Book Rating :4.8/5 (517 download)
Book Synopsis Ultra High Bypass Nacelle Aerodynamics Inlet Flow-Through High Angle of Attack Distortion Test by : National Aeronautics and Space Administration (NASA)
Download or read book Ultra High Bypass Nacelle Aerodynamics Inlet Flow-Through High Angle of Attack Distortion Test written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: A flow-through inlet test program was conducted to evaluate inlet test methods and determine the impact of the fan on inlet separation when operating at large angles of attack. A total of 16 model configurations of approximately 1/6 scale were tested. A comparison of these flow-through results with powered data indicates the presence of the fan increased separation operation 3 degrees to 4 degrees over the flow through inlet. Rods and screens located at the fan face station, that redistribute the flow, achieved simulation of the powered-fan results for separation angle of attack. Concepts to reduce inlet distortion and increase angle of attack capability were also evaluated. Vortex generators located on the inlet surface increased inlet angle of attack capability up to 2 degrees and reduced inlet distortion in the separated region. Finally, a method of simulating the fan/inlet aerodynamic interaction using blockage sizing method has been defined. With this method, a static blockage device used with a flow-through model will approximate the same inlet onset of separation angle of attack and distortion pattern that would be obtained with an inlet model containing a powered fan. Larkin, Michael J. and Schweiger, Paul S. Unspecified Center...
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