Approach of Reduction of Aerodynamic Noise of Pantograph Cavity of High-speed Train Based on Jet

The increase of high-speed train speed gives rise to a more prominent problem of aerodynamic noise, a large part of which is caused by pantograph. Therefore, this paper proposed a method of active noise reduction by jet. Through the establishment of a three-car consist model, the steady SST k-w turbulence model and wide-band noise model were adopted for simulation to analyze the sound source and flow field characteristics of the pantograph aerodynamic noise of high-speed train. Large eddy simulation and FW-H acoustic theory were based to solve the aerodynamic noise characteristics of the pantograph. The numerical results show that the noise reduction effect of positive jet is significant, while that of reverse jet is minor. At the train speed of 350 km/h, the average total sound pressure level decreases by 6.04 dB at the standard monitoring points with positive jet. The numerical examples demonstrate the validity of the proposed jet active noise reduction. © 2020, Department of Journal of the China Railway Society. All right reserved.