光滑圆柱风噪声的降噪措施研究

沈国辉1,张扬1,郑翀2,宋刚3,王轶文3

振动与冲击 ›› 2020, Vol. 39 ›› Issue (23) : 52-57.

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (23) : 52-57.
论文

光滑圆柱风噪声的降噪措施研究

  • 沈国辉1,张扬1,郑翀2,宋刚3,王轶文3
作者信息 +

Denoising measures against aeolian noise of smooth circular cylinders

  • SHEN Guohui1, ZHANG Yang1, ZHENG Chong2, SONG Gang3, WANG Yiwen3
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摘要

为了降低光滑圆柱的风噪声,进行了多种降噪措施的系统研究,采用声学风洞试验获得光滑圆柱的风噪声特征,对三种抑噪措施即绕螺旋线、节径突出和添加轴向附加线开展多组参数的降噪效果测试,对比添加抑噪措施前后圆柱的风噪声频谱和A计权总声压级,最后总结提出光滑圆柱降噪措施的建议。结果表明:圆柱风噪声的卓越频率随着风速的增大而呈线性增大,卓越频率反算的斯托拉哈数为0.197-0.200;对于光滑圆柱的抑噪措施,缠绕扰流线的降噪效果最好,添加节径突起次之,沿轴向添加附加线的降噪效果最差,甚至出现了增大风噪声的情况;对于直径24mm左右的光滑圆柱,建议采用单根直径4mm的圆形扰流线、10cm的间距布置,若采用两根扰流线并列布置可获得更好的降噪效果。

Abstract

In order to reduce aeolian noise of smooth circular cylinders, multiple denoising measures were systematically studied.Aeolian noise characteristics of smooth circular cylinders were obtained with acoustic wind tunnel tests.Three kinds of noise suppression measures including winding spiral, protruding pitch diameter and adding axial additional line were tested for noise reduction effect of multiple groups of parameters.Wind noise spectrum and A-weighted total sound pressure level of cylinder before and after adding noise suppression measures were compared.Finally, suggestions for noise reduction measures of smooth cylinder were proposed.Results showed that the predominant frequency of cylindrical wind noise increases linearly with increase in wind speed, Strouhal number of inverse calculation of predominant frequency is 0.197-0.200; for noise suppression measures of smooth cylinder, the noise reduction effect of winding disturbing streamline is the best, followed by that of adding pitch protrusion, and the noise reduction effect of adding additional line along axial direction is the worst, and even wind noise increases; for smooth cylinder with diameter of about 24 mm, it is recommended to use a single circular spoiler with diameter of 4 mm and a spacing of 10 cm; if two disturbing streamlines are arranged side by side, better noise reduction effect can be obtained.

关键词

光滑圆柱 / 风噪声 / 声学风洞 / 风洞试验 / 抑噪措施

Key words

smooth circular cylinder / aeolian noise / acoustic wind tunnel / wind tunnel tests / denoising measure

引用本文

导出引用
沈国辉1,张扬1,郑翀2,宋刚3,王轶文3. 光滑圆柱风噪声的降噪措施研究[J]. 振动与冲击, 2020, 39(23): 52-57
SHEN Guohui1, ZHANG Yang1, ZHENG Chong2, SONG Gang3, WANG Yiwen3. Denoising measures against aeolian noise of smooth circular cylinders[J]. Journal of Vibration and Shock, 2020, 39(23): 52-57

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