New Head-type Design and Aerodynamic Performance Study of 500 km/h High-speed EMU

doi:10.3901/JME.2019.18.142

Abstract

Abstract: Based on indicators including man-machine engineering, aerodynamic force and aerodynamic noise, comprehensive evaluation and multidisciplinary optimization design of aerodynamic performance for the 500 km/h high-speed electric multiple unit (EMU) head-type is completed. Then the influence law for aerodynamic performance affected by key parameters including expansion amount of control points on the cowcatcher, nose tip height and front window profile is obtained under higher velocity level. Among them, the height of front window influences resistance most, and expansion amount of control points on the cowcatcher influences aerodynamic noise most. After optimization, the total resistance will be reduced 6.9%, and the average pressure level of the aerodynamic noise will be reduced by 1.6 dBA, which meets the design requirements of low resistance and low noise. And influence law of vehicle resistance, tail car lift, aerodynamic noise, pressure wave and transverse wind running performance, etc. are obtained, which are affected by the running speed. The comprehensive performance of new head-type is better than existing EMU head-type, and related research data could provide technical support for higher level speed EMU design.

Key words: electric multiple unit (EMU), new head-type, aerodynamic performance, optimization design, wind tunnel test

CLC Number:

U238
U270

LI Ming, LIU Nan, WANG Dahai. New Head-type Design and Aerodynamic Performance Study of 500 km/h High-speed EMU[J]. Journal of Mechanical Engineering, 2019, 55(18): 142-149.

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