Research Of The Influence On High-Speed Railway Tunnel Exit Micro-Pressure Wave

April 2006, about 1,300 km Beijing-Shanghai high-speed railway, after 12 years of proof, finally entered the implementation stage, will be put into operation in 2010, indicating that a large-scale high-speed railway construction peak has arrived. With the increase train speed trains through the tunnel when the induced effects will be aggravated aerodynamics. The tunnel will have a significant pressure fluctuations and the micro-pressure wave caused the exit of the tunnel, This brought comfort and tunnels surrounding environment, and other issues. Accordingly, the effects of measures to slow down the tunnel aerodynamics-depth study is necessary.In this paper, model testing and digital simulation were used to carry on the research. Southwest Jiaotong University has completed the test model using the advanced world level "high-speed railway model projecting testing stand". Digital simulation of three-dimensional viscous, compressible, such as entropy, unsteady flow in the Navier-Stokes equations. Regional discrete finite volume method for the use of a large fluid analysis software FLUENT calculated.When high-speed train travels across tunnel without the tunnel hood, initial micro-pressure wave is the origin of the internal pressure wave in the tunnel and the origin of the micro-pressure around the exit of the tunnel. In previous work, with the conclusion, this paper will focus on cross passage set up by model tests and digital calculation of the pressure fluctuations and the exit of the tunnel micro-pressure wave detailed study.Through model tests and digital calculation of the additional cross passage exit mechanism of micro-pressure waves, gives the general conclusion.By digital calculation of the cross passage installed in different locations studied, comes to that the different locations of a single cross passage relationship with initial compression wave, the pressure fluctuations and the tunnel exit micro-pressure waves, gives the general conclusions of optimal placement of a single cross passage.By digital calculation of the cross passage length relationship with the tunnel micro-pressure wave, combined with cross passage position changes draws horizontal length of the cross passage mechanism of micro-pressure waves.By digital calculation ,conduct a study on the relationship between the number of cross passage and the micro-pressure. Come to that, the number of cross passage has a significant effect on micro-pressure wave of tunnel exit, and be able to effectively ease the effects of the tunnel aerodynamics.