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Transonic Rotor Noise - Theoretical and Experimental Comparisons,
ARMY RESEARCH AND TECHNOLOGY LABS MOFFETT FIELD CA AEROMECHANICS LAB
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Two complementary methods of describing the high-speed rotor noise problem are discussed. The first method uses the second-order transonic potential equation to define and characterize the nature of the aerodynamic and acoustic fields and to explain the appearance of radiating shock waves. The second employs the Ffowcs Williams and Hawkings equation to successfully calculate the acoustic far-field. Good agreement between theoretical and experimental waveforms is shown for transonic hover tip Mach numbers from 0.8 to 0.9. Author
APPROVED FOR PUBLIC RELEASE