前缘锯齿对边界层不稳定噪声的影响

doi:10.7527/S1000-6893.2016.0104

Abstract

Abstract:

In order to explore the noise reduction law of the bionics leading-edge serrations, the effect of nine leading-edge serrations on blade laminar boundary layer instability noise has been investigated experimentally at low to moderate Reynolds number (Re=(2-8)×10⁵) and different angle of attacks. It can be concluded that leading-edge serrations can decrease and even totally suppress blade laminar boundary layer instability noise. The noise reduction effect is very sensitive to both serration amplitude and serration wavelength, and the blade with larger amplitude and smaller wavelength has better noise reduction effect, which can reach a maximum of 30 dB. The noise reduction mechanism is attributed to the stream-wise vortices induced by the leading-edge serrations, which can affect blade downstream boundary layer flow and then destroy the acoustic feed-back loop. The leading-edge serrations have no effect on the instability noise peak frequency.

Key words: leading-edge serrations, instability noise, T-S wave, separation bubble, acoustic feed-back loop

CLC Number:

V231

CHEN Weijie, QIAO Weiyang, TONG Fan, DUAN Wenhua, LIU Tuanjie. Effect of leading-edge serrations on boundary layer instability noise[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(12): 3634-3645.

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Effect of leading-edge serrations on boundary layer instability noise

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