Preliminary Investigation on the Distribution of Aerodynamic Noise Sources and Generation Mechanism of 600 km/h High-Speed Maglev Train
The noise of high-speed maglev train mainly comes from aerodynamic noise,and the future speed of the train can reach 600 km/h.The aerodynamic noise is proportional to 6～8th of the train speed,which will bring line environmental problems.This paper takes the full-size high-speed maglev train model as the research object,based on the delayed detached eddy simulation method(DDES),and analyzes the mechanism of its surface noise generation in combination with the flow field characteristics of maglev trains,which provides a basis for the evaluation of high-speed maglev train aerodynamic noise performance and line noise barrier design.The main research contents are as follows:Due to the direct impact of airflow and flow separation,the main noise source in the streamlined area of the head of the maglev train is distributed in the nose posi-tion,and the maximum value of total sound pressure level(SPL)is 106.48 dB;The complex local vortex and vortex shed-ding at the nose of the tail of the train is the reason for making it the main noise source in the streamlined area of the tail of the train,and the maximum value of total SPL at the nose of the tail of the train is 124.75 dB;The results show that the cavity noise is caused by vortex in windshield gap,and the noise of windshield bottom is affected by the coupling effect of cavity noise and the gap between vehicle and ground.The maximum sound pressure level(SPL)appears at the windshield bottom,which is 115.94 dB,118.29 dB,123.36 dB and 120.05 dB respectively.Radio terminal surface airflow smooth flow did not occur flow separation,the SPL at each part of the surface is similar overall,and the level at the tail is higher than that at the head.
600 km/h high-speed maglev trainaerodynamic noisenoise sourcenumerical simulation
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