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Effect of wake structure on blade-vortex interaction phenomena: Acoustic prediction and validationDuring the Higher Harmonic Control Aeroacoustic Rotor Test, extensive measurements of the rotor aerodynamics, the far-field acoustics, the wake geometry, and the blade motion for powered, descent, flight conditions were made. These measurements have been used to validate and improve the prediction of blade-vortex interaction (BVI) noise. The improvements made to the BVI modeling after the evaluation of the test data are discussed. The effects of these improvements on the acoustic-pressure predictions are shown. These improvements include restructuring the wake, modifying the core size, incorporating the measured blade motion into the calculations, and attempting to improve the dynamic blade response. A comparison of four different implementations of the Ffowcs Williams and Hawkings equation is presented. A common set of aerodynamic input has been used for this comparison.
Document ID
19960000136
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Gallman, Judith M.
(NASA Ames Research Center Moffett Field, CA, United States)
Tung, Chee
(NASA Ames Research Center Moffett Field, CA, United States)
Schultz, Klaus J.
(NASA Ames Research Center Moffett Field, CA, United States)
Splettstoesser, Wolf
(NASA Ames Research Center Moffett Field, CA, United States)
Buchholz, Heino
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
AD-A294477
NAS 1.15:110825
NASA-TM-110825
Accession Number
96N10136
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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