Suppression on Aerodynamic noise of slat by using SNGR method

YUPei-xun 1 PAN Kai 1 BAI Jun-qiang 2 HAN Xiao 2

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (4) : 110-115.

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (4) : 110-115.

Suppression on Aerodynamic noise of slat by using SNGR method

  • YUPei-xun 1  PAN Kai 1  BAI Jun-qiang 2  HAN Xiao 2 
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Abstract

Coupled with turbulent velocity generation model and sound propagation equation, the SNGR (Stochastic Noise Generation and Radiation) method which is able to simulation the noise source propagate in the non-uniform flow field has been formed. In order to validate the SNGR method, the noise propagation of the 30P30N model’s slat is selected. Comparing the frequency spectrum of the monitor at trailing edge of slat and the contour of noise directivity, numerical results are well consistent with the literature’s results. Several different geometrical configurations of slats are designed, researching their depressing effects on aerodynamic noise. Adopting the SNGR method, the acoustic pressure contour and noise directivity contour of each configuration are analyzed, and the noise depressing effects are validated by means of LES/FWH method, the result shows: 1. By extending the effective length of the leading edge of slat, the stability of shear layer is strengthened and the intensity of the collision between shear layer and leeward region of slat is decreased. Because of these reasons, the noise of slat is reduced. 2. The SNGR method can be applied to the noise prediction and suppression of two dimensional high-lift configuration.
 

Key words

turbulent velocity generation model / sound propagation equation / slat / aerodynamic noise / shear layer

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YUPei-xun 1 PAN Kai 1 BAI Jun-qiang 2 HAN Xiao 2 . Suppression on Aerodynamic noise of slat by using SNGR method[J]. Journal of Vibration and Shock, 2018, 37(4): 110-115

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