本文针对单根和双分裂导线风噪声采用混合计算方法进行数值模拟,基于导线的绞线结构进行建模,获得单导线风场和声场的分布特征,并与同直径的光滑圆柱结果进行对比,最后,针对水平和垂直布置双分裂导线风场和声场进行研究。研究表明:导线的阻力系数和总声压级均小于光滑圆柱,而斯特罗哈数大于光滑圆柱;在卓越频率段导线和光滑圆柱的风噪声呈现了明显的8字形指向性,而在远离卓越频率段呈现圆形指向,说明导线和圆柱风噪声是一种偶极子声源;导线和光滑圆柱风噪声的总声压级总体呈圆形、略呈8字形分布;垂直布置双分裂圆柱因相互之间无干扰,总声压级为两根单导线风噪声声压级之和;垂直布置的双分裂导线风噪声略小于水平布置双分裂导线风噪声。
Abstract
Numerical simulation using hybrid method was employed to analyze the aeolian noise generated by single and twin bundled conductors. The calculating model of the single conductor was built based on its stranded shape. The wind and acoustic field of the single conductor were analyzed and compared with those of smooth circular cylinder with same diameter. Finally, the wind and acoustic field of twin bundled conductors in horizontal and vertical arrangements were also studied. Results show that drag coefficient and sound pressure level (SPL) of the single conductor are smaller than those of the smooth circular cylinder with same diameter, whereas the Strouhal number of the conductor are bigger than that of the circular cylinder. In the dominating frequency range, the SPL directionality of the conductor and circular cylinder has a shape of figure-of-eight, and in the range away from the dominating frequency, the SPL directionality has a shape of circle, indicating that the aeolian noise generated by conductors and circular cylinders belongs to the dipole type of acoustic source. The overall sound pressure level (OASPL) of conductors and circular cylinder has a shape of almost circle shape and a little bit shape of figure-of-eight. The OASPL of twin bundled conductors in vertical arrangement are equaled to that of two single conductors. The OASPL of twin bundled conductors in vertical arrangement are slightly smaller than that of twin bundled conductors in horizontal arrangement.
关键词
风噪声 /
光滑圆柱 /
双分裂导线 /
数值模拟 /
大涡模拟
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Key words
aeolian noise /
smooth circular cylinder /
twin bundled conductors /
numerical simulation /
large eddy simulation;
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