Noise reduction mechanism of the surface vortex generator set on a slender cylinder

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (10) : 170-176.

ZHANG Shichen1,WANG Chunjiang1,SUN Xiangdong2,CHANG Yi2

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Abstract

Using large eddy simulation and acoustic analogy, the influence of rectangular strip as vortex generator on aerodynamic noise of cylinder was studied. The diameter of cylinder was 0.016m in this research. Besides, four analysis of cylinder with strips were conducted, and the height diameter ratio of strip were respectively 1/8, 1/4, 3/8 and 1/2. Without strips, the noise source of cylinder is near boundary layer separation point. After setting strips, it was found that the flow around cylinder is low-turbulent, and the transverse correlation of large scale vortex structure is destroyed resulting in large phase difference of pressure fluctuation on the surface of the cylinder. The trapped vortex structure appears in the upstream of strip, which inhibits the growth of separated shear layer and reduces pressure fluctuation on the upper and lower surfaces of cylinder. The couple of two mechanisms suppresses aerodynamic noise around cylinder. When the height diameter ratio of strip is 3/8, noise reduction measure performs best and in the main radiation direction, the tonal noise is reduced by 18.17dB.

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flow past cylinder / aerodynamic noise / rectangular strip / noise reduction / numerical simulation

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ZHANG Shichen1,WANG Chunjiang1,SUN Xiangdong2,CHANG Yi2. Noise reduction mechanism of the surface vortex generator set on a slender cylinder[J]. Journal of Vibration and Shock, 2022, 41(10): 170-176

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