High Speed Railway Tunnel Portal Buffer Structure Numerical Simulation And Model Test Research

Crossing the line can be shortened to improve and shorten the distance by tunnels. But when the high-speed train entering a tunnel when they will produce a series of aerodynamic problems, some of which will train, tunnel and adversely affect the surrounding environment, it must be controlled to reduce the hazards.At present, the test device researching train-tunnel aerodynamic effects is not advanced enough, and there are some flaws that the similarity ratio is too small and accuracy is not enough. In order to better study the form and dimensions of tunnel-hood buffer structure, it is necessary to establish a large scale model test bench.Based on the863Project-"key technologies of high-speed railway tunnel noise reductio n" charged by Southwest Jiaotong University, the parameters of opening buffer structure that is on the top of the high-speed railway tunnel entrance have been studied by the means of numerical simulation and model test, and its conclusions can guide the actual project. The main achievements are as follows:(1)The dynamic model of the new testing system for large scale high speed train has a obvious technical advantages. The advantages are manifested in the following aspects:the advanced acquisition equipment, the stable transmission system and the data processing module is also convenient and efficient, test results are real and reliable which has unique advantages in the quantitative analysis.(2)Numerical calculation of the parameters of high speed railway tunnel portal opening the top opening of buffer structure in different operation speed is simulated by this paper. It determines the optimum opening rate and opening position.(3) Model tests and numerical results are consistent with their difference is within the range of allowable error, and they can confirm each other.