The Effect Of Porous Fence On Operational Sfaety Of Vehicle Under Strong Cross Wind

In the running of high speed train on wind load effect is very sensitive, train flow around the issue of research is very important, its main performance is:train and air caused by the interaction of a series of influence of train energy consumption, safety, comfort and environmental hazard of aerodynamic problems. For driving on the bridge of high speed train, its under strong cross-wind stability problem appears more outstanding, active measures must be taken to ensure the stability of trains under strong cross-wind. Based on bridges running on the train as the object, the CFD numerical simulation and wind tunnel model test, studied at the bridge at different heights, different ventilation rate setting windscreen on train aerodynamic characteristics influence. The results show that, the bridge structure is arranged on the windscreen can obviously reduce the train for the aerodynamic force, and when the bridge is provided with4m,20%ventilation rate wind screen structure is most reasonable. Secondly, in order to ensure the structural safety of a windscreen, the commercial finite element software ANSYS on the windscreen and modal analysis, the determination of the natural frequencies of structures, with the train of fluctuating wind frequency relative ratio, proved the windscreen in trains structure under pulsating wind resonance phenomenon does not occur.1. Based on the finite volume method, the flow equations are spatially discretized space domains and code FLUENT is used to build multi-layer hybrid grid. After a great number of trial calculation, the size of solution region is determined. STT k-eddy viscosity coefficient model is chosen to model turbulent flow in Reynalds time-averaged equations.2.The two-dimensional numerical simulation is used to study the train aerodynamic coefficient at different heights, different ventilation ratio.3.The effectiveness of the two-dimensional numerical simulation is verified by the wind tunnel model test, and the different wind angle on train aerodynamic coefficient is considered.4,.The train movement simulation is realized through the three-dimensional numerical simulation to test the train aerodynamic coefficient considering the windscreen which is determined by the two-dimensional numerical analysis and wind tunnel test, and the critical capsize wind speed of the different train speed is studied.5.The modal of the selected windscreen is analyzed by ANSYS to determine the relationship between the inherent characteristics of windscreen and the train wind frequency.