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光滑圆柱风噪声的风洞试验研究 预览 被引量:1

Wind tunnel tests for aeolian noise generated by a smooth circular cylinder
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摘要 针对光滑圆柱在不同风速时的风噪声问题,建造了用于杆系结构风噪声试验的声学风洞。进行了11种直径圆柱在4种风速下的风洞试验,分析了圆柱风噪声的频谱特征和卓越频率,探讨了累计卓越声压级和卓越频带宽度等随风速和雷诺数的变化规律。结果表明:圆柱风噪声的卓越频率随着风速的增大呈线性增加,随直径的增加呈反比例降低;在试验雷诺数范围(3×10 3~1×10 5)内由卓越频率反算的斯特罗哈数约为0.20,并随着雷诺数增加呈缓慢减小趋势;圆柱的累计卓越声压级随着雷诺数的增大而增大,在雷诺数较小(<3×10 4)时离散较大,在较大雷诺数时离散减小。 In order to study aeolian noise generated by a smooth circular cylinder under different wind speed conditions,an acoustic wind tunnel was built to conduct aeolian noise tests of rod system type structures.The wind tunnel tests for circular cylinders of 11 diameters were conducted under 4 wind speeds.The frequency spectra’s characteristics and dominant frequencies of aeolian noises generated by circular cylinders were analyzed.Finally,the variation laws of accumulative dominant sound pressure levels and dominant frequency band widths with varying wind velocity and Reynolds number were investigated.Results showed that dominant frequencies of wind noises generated by circular cylinders are proportional to wind speed and inverse proportional to diameter of circular cylinder;Strouhal number calculated from dominant frequencies within Reynolds number range of 3×10 3-1×10 5 is about 0.20,it has a gradually decreasing trend with increase in Reynolds number;the accumulative dominant sound pressure levels increase with increase in Reynolds number,they disperse more within a lower Reynolds number range of less than 3×10 4,and less within a higher Reynolds number range.
出处 《振动与冲击》 CSCD 北大核心 2018年第7期85-90,共6页 Journal of Vibration and Shock
基金 国家自然基金资助项目(51178425) 浙江省自然科学基金资助项目(Y16E080016)
关键词 风噪声 光滑圆柱 声学风洞 风洞试验 声压级 aeolian noise smooth circular cylinder acoustic wind tunnel wind tunnel test sound pressure level
作者简介 沈国辉男,副教授,1977年生E-mail:ghshen@zju.edu.cn
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