旋翼桨涡干扰噪声开环桨距主动控制研究

doi:10.7527/S1000-6893.2014.0045

Abstract

Abstract:

Blade-vortex interaction (BVI) noise is one of the most annoying and intrusive kinds of noise and becomes dominant during skew descent flight, and open-loop active blade pitch control is one of the effective means to reduce BVI noise. A research on the effect of open-loop active blade pitch control on rotor BVI noise alleviation is carried out to find out the influencing rules and to make clear the mechanism of it. The rotor free wake model which could consider the impact of open-loop active blade pitch control is built first, and then open-loop active blade-pitch control on rotor BVI noise alleviation model is established with the rotor aerodynamic model and the rotor loading noise model based on the FW-H (Ffowcs Williams-Hawkings) equation. The research is carried out to investigate the effect of open-loop active blade pitch control on BVI noise level based on a 40-percent geometrically scaled BO-105 helicopter model rotor under wind trim conditions. By analyzing variations of BVI sound pressure level and the distribution of angle of attack on rotor disk when experiencing phase sweep and amplitude sweep control, the influencing rules of active blade pitch control on BVI noise level are summarized, and the mechanism of BVI noise reducing through active blade pitch control is found out: appropriate active blade pitch control could improve the distribution of angle of attack on rotor disc, and then decrease aerodynamic loads where BVI happens, causing the alleviation of BVI noise finally.

Key words: helicopter, rotor, blade-vortex interaction, noise, free wake, active control

CLC Number:

V211.52

FENG Jianbo, LU Yang, XU Jinfa, WANG Chao. Research on the Effect of Open-loop Active Blade-pitch Control on Rotor BVI Noise Alleviation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(11): 2901-2909.

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Research on the Effect of Open-loop Active Blade-pitch Control on Rotor BVI Noise Alleviation

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