Acoustics of Transonic Flow Around an Oscillating Flap

[+] Author and Article Information
A. S. Lyrintzis, Y. Xue

Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455

J. Fluids Eng 114(2), 240-245 (Jun 01, 1992) (6 pages) doi:10.1115/1.2910021 History: Received July 16, 1990; Online May 23, 2008


Investigation of noise mechanisms due to unsteady transonic flow is important for aircraft noise reduction. In this work, the near-field impulsive noise due to an oscillating flap is simulated numerically. The problem is modeled by the two-dimensional high frequency transonic small disturbance equation (VTRAN2 code). The three types of unsteady shock wave motion have been identified. Two different important disturbances exist in the pressure signal. The disturbances are related to the unsteady motion of the supersonic pocket and fluctuating lift, and drag forces. Pressure wave signatures, noise frequency spectra, and noise directivity are shown.

Copyright © 1992 by The American Society of Mechanical Engineers
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