Abstract In order to study the effect of the strip spacing on the aerodynamic noise characteristics of the pantograph of high-speed train, the numerical simulation of the aerodynamic flow behavior for the high-speed pantograph is conducted using the detached eddy simulation (DES) and its aerodynamic noise is studied using the FW-H model. The numerical method is verified by flows around a cylinder with a finite span. The numerical results show that the strip spacing has a great effect on the aerodynamic characteristics of the pantograph. When there is only one strip, the aerodynamic drag force is reduced by 10.4% compared with the double-strip pantographs. The fluctuation in pressure on the strip and the fluctuation in lift force of the panhead are the smallest. The aerodynamic drag force of the double-strip pantograh increase with the incremental of the strip spacings. Under different strips spacings, the vortex structure around the panhead is different, and the inappropriate strip spacing will aggravate the fluctuation in forces due to the vortex shedding from the strip. The vortex shedding frequencis are mainly 270Hz, 540Hz, 820Hz. Meanwhile, the strip spacing has few effect on the frequency of vortex shedding. The radiated noise from the pantograph is transmitted in the form of a spherical wave. When the strip spacing is 0 ​mm or 540 ​mm, the sound pressure level of the far field radiation noise of the pantograph is smaller. The energy of the far field aerodynamic noise of the pantograph is mainly concentrated in the frequency range of 200–1600 ​Hz. For a pantograph with double-strip, when the spacing is 540 ​mm, the sound pressure level at the noise measurement point (25m, 0, 3.5m) is the smallest. Whereas the strip spacing is 475 ​mm, the sound pressure level is the largest and the difference reaches 2.8 dBA.

中文翻译：

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不同带间距高速受电弓气动噪声特性研究

摘要 为研究钢带间距对高速列车受电弓气动噪声特性的影响，采用分离涡模拟（DES）方法对高速受电弓气动流动特性进行数值模拟。其气动噪声采用 FW-H 模型进行研究。数值方法通过有限跨度圆柱体周围的流动来验证。数值结果表明，带间距对受电弓的气动特性有很大影响。当只有一条带时，气动阻力比双带受电弓降低10.4%。带钢压力波动和盘头升力波动最小。双带受电弓的气动阻力随着带间距的增加而增加。在不同的条间距下，盘头周围的涡流结构是不同的，不合适的条间距会加剧由于从条中脱落的涡流而引起的力的波动。涡旋脱落频率主要有270Hz、540Hz、820Hz。同时，条间距对涡旋脱落频率的影响很小。来自受电弓的辐射噪声以球面波的形式传输。当条间距为0mm或540mm时，受电弓远场辐射噪声的声压级较小。受电弓远场气动噪声的能量主要集中在200-1600Hz的频率范围内。对于双带受电弓，当间距为540mm时，噪声测量点（25m、0、3.5m）处的声压级最小。而条间距为475毫米，声压级最大，差异达到2.8 dBA。