基于fluent的高速列车受电弓主被动整体降噪研究

针对高速列车气动噪声越来越大的问题,本文以高速列车某车型为参考建立1:1受电弓区域局部模型,基于宽频带噪声源模型、LES大涡模拟及FW-H声学模型,运用弓头仿生降噪和底部空腔主动射流降噪的整体降噪措施,采用数值模拟法研究高速列车受电弓区域的降噪效果。结果表明:受电弓弓头和底部空腔是气动噪声的主要来源;降噪后,主要噪声源的声功率级都有了较大降幅,其中弓头和空腔部位分别降低了15.28 d B和16.92 d B;中高楼层住宅处的降噪效果更佳,最大声压级降低位置在距地面18 m高处(距受电弓25 m远处),降低了4.94 d BA;远场声压级在低频区域降噪效果更为显著,特别是在800 Hz位置声压级降幅最大,降低了8.21 d BA。

Study on active and passive cooperative noise reduction of high-speed train's pantograph based on fluent

In view of the increasing aerodynamic noise of high-speed train,a 1:1 local model of pantograph area is established based on a high-speed train model.Based on the broadband noise source model,large eddy simulation and FW-H acoustic model,the whole noise reduction measures of pantograph head bionic structure optimization and bottom cavity active jet are used to study the noise reduction of high-speed train pantograph area effect.The results show that:the pantograph head and bottom cavity are the main sources of aerodynamic noise;after noise reduction,the sound power levels of the main noise sources are reduced by 15.28 dB and 16.92 dB respectively;the noise reduction effect of medium and high rise buildings is better,and the maximum sound pressure level is reduced by 4.94 dBA at 18 m above the ground(25 m away from the pantograph);the noise reduction effect of far-field sound pressure level is more significant in low-frequency region,especially at 800 Hz position,the largest reduction is 8.21 dBA.