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30 May 1995 Active control of wake-blade row interaction discrete frequency noise
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This paper is concerned with active control of discrete frequency noise generated by subsonic blade rows. Airfoil surface oscillating actuators are used to generate control propagating pressure waves. These control waves interact with the blade row interaction generated propagating acoustic waves, thereby, in principle canceling the acoustic waves and thus the far-field discrete frequency tones. A mathematical model is developed based on the LinSub flat plate unsteady aerodynamic analysis to investigate the feasibility of this technique and to evaluate actuator requirements. Then a series of experiments are described directed at both verifying the basic math model assumptions, and investigating the fundamentals of this active discrete frequency noise control technique.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sanford Fleeter "Active control of wake-blade row interaction discrete frequency noise", Proc. SPIE 2494, Sensing, Actuation, and Control in Aeropropulsion, (30 May 1995);

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