Numerical Simulation Of The Pressure Of High Speed Train In Special Environments

In this thesis, CRH2 high speed train is selected as the researching object. The air turbulent flow field of high speed train moving in special environments is numerically investigated by using the software CFdesign with the k-εtwo-equation model selected. Author uses the software ICEM CFD to mesh the calculating domain and the surface of trains to structured grid, and applies the moving grid generation technique in CFdesign for simulating the real crossing of two trains. According to these steps, author calculates two high speed trains crossing in different train speed and one single train passing through the tunnel in different train speed, train-tunnel dimension ratio or in different cushion structure conditions numerically.By analyzing the computing result theoretically, author finds out the pressure fluctuations of the air inlet and outlet when the train passing through the tunnel,knows how the compression and micro-pressure wave being created.At the same time,author also researches the influence of train-tunnel dimension ratio, cushion structure of the tunnel and train speed on the air inlet and outlet.At last,author finds out the pressure fluctuations of the air inlet and outlet when two trains passing by each other and one single train moving in the open air.