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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2011, Vol. 12 Issue (12): 957-963    DOI: 10.1631/jzus.A11GT008
Aerodynamics     
Unsteady simulation for a high-speed train entering a tunnel
Xin-hua Li, Jian Deng, Da-wei Chen, Fang-fang Xie, Yao Zheng
School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China, National Engineering Laboratory for System Integration of High-Speed Train (South), CSR Qingdao Sifang Co., Ltd., Qingdao 266111, China
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Abstract  In order to study the unsteady aerodynamics effects in railway tunnels, the 3D Reynolds average Navier-Stokes equations of a viscous compressible fluid are solved, and the two-equation k-ε model is used in the simulation of turbulence, while the dynamic grid technique is employed for moving bodies. We focus on obtaining the changing tendencies of the aerodynamic force of the train and the aerodynamic pressures on the tunnel wall and train surface, and discovering the relationship between the velocity of the train and the intensity of the micro pressure wave at the tunnel exit. It is shown that the amplitudes of the pressure changes in the tunnel and on the train surface are both approximately proportional to the square of the train speed, so are the microwave and the drag of the train.

Key words： High-speed train      Aerodynamics      Railway tunnel      Numerical analysis     
Received: 23 September 2011      Published: 01 December 2011
CLC:  U270.1+1  
  V211  
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Xin-hua Li
Da-wei Chen
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Fang-fang Xie
Yao Zheng
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Xin-hua Li, Jian Deng, Da-wei Chen, Fang-fang Xie, Yao Zheng. Unsteady simulation for a high-speed train entering a tunnel. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2011, 12(12): 957-963.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A11GT008     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2011/V12/I12/957

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