TS-83 Acoustic Suppression of Tone Noise and Blade Force due to Gust-Rotor Interaction(Session D-1 Control of Unsteady Flow and Noise)

概要

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The problem of aeroacoustically suppressing the tone noise and unsteady blade loading due to interaction of the rotor with the gust by means of sound waves from an actuator surface composed as a part of the duct wall is studied. The-oretical analysis based on the unsteady lifting surface theory for a rotating annular cascade with numerical calculations is conducted for a simple harmonic sinusoidal gust and a simple harmonic sinusoidal circumferential wave form of the actuator motion and optimum conditions of the actuator motion are investigated. There are substantial differences in the optimum phase and amplitude of the actuator motion among the conditions of suppressing the upstream and downstream acoustic powers and the mean squared lift force on blades. In the case of multiple cut-on duct modes the actuator motions of the cut-off circumferential wave numbers must be used to suppress the acoustic powers.
公益社団法人日本ガスタービン学会の論文
1999-11-14