不同外径输电线风噪声的试验研究
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摘要
针对不同外径和风速下输电线的风噪声问题,进行了5种输电线在4种风速下的风洞试验,分析了输电线风噪声的频谱特征、卓越频率及对应的斯特罗哈数,探讨了总声压级和A计权总声压级,并对比了相近外径输电线和光滑圆柱风噪声。结果表明:输电线风噪声主要由风流经表面产生的涡脱引起,卓越频率与涡脱频率非常接近;风噪声涡脱的斯托罗哈数随雷诺数增加呈增大趋势;输电线风噪声的A计权总声压级随着风速的增大而增大,随输电线外径的增大而减小;高风速下输电线风噪声的A计权总声压级小于同直径的光滑圆柱,两者差距随着风速的增加而增大。
In order to study the aeolian noise generated by transmission lines with different external diameters at different wind speeds, aeolian noise experiments of five kinds of transmission lines at four different wind velocities were carried out. The spectrum characteristics, peak frequency and corresponding Strouhal Number of the aeolian noises were analyzed. The overall sound pressure level and A-weighted overall sound pressure level were also studied. Finally, the aeolian noise of transmission lines and smooth circular cylinders with nearly the same external diameters were compared. The results show that the aeolian noise of transmission lines is mainly generated from the vortex-shedding of the passing flow, resulting in the fact that the peak frequency is very close to the vortex-shedding frequency. The Strouhal Number of the aeolian noises of transmission lines shows a rising trend with the increase of the Reynolds number. The A-weighted overall sound pressure level of aeolian noise of transmission lines increases with the increase of the wind speed and decreases with the increase of the external diameter. The A-weighted sound pressure level of transmission lines is smaller than that of smooth circular cylinders with the same external diameters in higher wind speed condition, and the difference between them will become larger if the wind speed increases.
In order to study the aeolian noise generated by transmission lines with different external diameters at different wind speeds, aeolian noise experiments of five kinds of transmission lines at four different wind velocities were carried out. The spectrum characteristics, peak frequency and corresponding Strouhal Number of the aeolian noises were analyzed. The overall sound pressure level and A-weighted overall sound pressure level were also studied. Finally, the aeolian noise of transmission lines and smooth circular cylinders with nearly the same external diameters were compared. The results show that the aeolian noise of transmission lines is mainly generated from the vortex-shedding of the passing flow, resulting in the fact that the peak frequency is very close to the vortex-shedding frequency. The Strouhal Number of the aeolian noises of transmission lines shows a rising trend with the increase of the Reynolds number. The A-weighted overall sound pressure level of aeolian noise of transmission lines increases with the increase of the wind speed and decreases with the increase of the external diameter. The A-weighted sound pressure level of transmission lines is smaller than that of smooth circular cylinders with the same external diameters in higher wind speed condition, and the difference between them will become larger if the wind speed increases.
引文
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[12]沈国辉,张扬,余世策,等.光滑圆柱风噪声的风洞试验研究[J].振动与冲击,2018,37(7):85-90.SHEN Guohui,ZHANG Yang,YU Shice,et al.Experimental study on aeolian noise generated by transmission lines using wind tunnel testing[J].Journal of Vibration and Shock,2018,37(7):85-90.
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[2]KAZUO T,TOSHIRO T,MASANORI I.Reduction of audible noise using asymmetrical bundles for 1 000 k Vtransmission lines:full-scale test results of Akagi test line[J].IEEE Transactions on Power Delivery,1996,11(3):1482-1491.
[3]OSAMU I,NOZOMU H.Sound generation by a twodimensional circular cylinder in a uniform flow[J].Journal of Fluid Mechanics,2002,471:285-314.
[4]FUJITA H,WEI S,FURUTANI H,et al.Experimental investigations and prediction of aerodynamic sound generated from square cylinders[J].AIAA Journal,1998,98:942-947.
[5]FUJITA H.The characteristics of the Aeolian tone radiated from two-dimensional cylinders[J].Fluid Dynamics Research,2010,42(1):154-168.
[6]IGLESIAS E L,THOMPSON D J,SMITH M G.Experimental study of the aerodynamic noise radiated by cylinders with different cross-sections and yaw-angles[J].Journal of Sound and Vibration,2016,361:108-129.
[7]HUTCHESON F V,BROOKS T F.Noise radiation from single and multiple rod configurations[J].International Journal of Aeroacoustics,2012,11(3):291-334.
[8]GEYER T,SARRADJ E,HEROLD G.Flow noise generation of cylinders with soft porous cover[C]∥AIAA/CEAS 21st Aeroacoustics Conference.Dallas:AIAA,2015.
[9]尤传永.输电线路低噪声导线的开发研究[J].电力建设,2005,26(9):1-5.YOU Chuanyong.Development and study on low noise conductor of transmission lines[J].Electric Power Construction,2005,26(9):1-5.
[10]田野,刘磊,侯帅,等.输电线路风噪声防治对策研究[J].南方电网技术,2015,9(1):19-24.TIAN Ye,LIU Lei,HOU Shuai,et al.Study on preventing measures for aeolian noise on transmission lines[J].Southern Power System Technology,2015,9(1):19-24.
[11]沈国辉,张扬,姜浩,等.基于大涡模拟和FW-H方程的二维圆柱风噪声模拟[J].湖南大学学报(自然科学版),2017,44(9):33-40.SHEN Guohui,ZHANG Yang,JIANG Hao,et al.Numerical simulation on aeolian noise for 2D circular cylinders based on large-eddy simulation and FW-H equation[J].Journal of Hunan University(Natural Sciences),2017,44(9):33-40.
[12]沈国辉,张扬,余世策,等.光滑圆柱风噪声的风洞试验研究[J].振动与冲击,2018,37(7):85-90.SHEN Guohui,ZHANG Yang,YU Shice,et al.Experimental study on aeolian noise generated by transmission lines using wind tunnel testing[J].Journal of Vibration and Shock,2018,37(7):85-90.
[13]ALOMAR A,ANGLAND D,ZHANG X,et al.Experimental study of noise emitted by circular cylinders with large roughness[J].Journal of Sound and Vibration,2014,333(24):6474-6497.