The Numerical Simulation Of The Pneumatic Effect Of The Shaft Slowdown Measures On High Speed Railways

In recent years, along with the continuous development of China’s high-speedrailway, a number of high-speed railway has been completed and successful operation.But the high-speed train passing a tunnel caused by aerodynamic problem has arousedextensive attention. High-speed operation of the train tunnel also has a unique technicalrequirements, the most important manifestation of the relevant characteristics ofaerodynamics. Along with the higher speed of the train, the pressure gradient, peak, andat the outlet of the micro-pressure wave, these factors have the feeling of the passengersin the car for the exit of the tunnel surrounding environment will have a significantdirect impact. Along with the rapid development of high-speed rail technology in China,in-depth study of the dynamic effects of the high-speed railway tunnel air principle, howit can be to slow down, etc., are very far-reaching significance and significant.Results of previous studies to tell us, is probably directly proportional relationshipbetween the size of the micro-pressure wave specific values and export of local pressuregradient and therefore micro-pressure wave of the main mitigation measures inoperation, a basic guiding principle is to pressure gradient to be reduced. Usually selectthe program to set the ventilation shaft into the tunnel, and thus can help slow down thegeneration of the aerodynamic effects and role of this program is not only economic, butalso more effective. For the case of a long tunnel, but to be the adoption of the reality.Of this study: numerical simulation and theoretical analysis, the close integrationbetween these two different methods, research shaft pressure fluctuations within thetunnel and the tunnel exit of the micro-pressure wave generated by the specific impact.At the theoretical level, the mechanism of action of the aerodynamic effects ofhigh-speed railway tunnel ventilation shaft to be a simple initial study, and then to studythe train into the tunnel at different speeds, the shaft different shapes, different layoutfor different lengths caused by the aerodynamic effect of the tunnel, expect to be able toseek the best combination of methods.Simulation analysis of the shaft in a different location, in the case of differentshapes, different combinations of the shape and position under the operation, andultimately get the best connection forms and combinations. Different length of thetunnel, the train speed, different combinations can be said that it would producedifferent effects, in addition, the different number of shafts will have a greater impact onthe aerodynamic effects.