Research On Testing Method And Interior Flow Field Of High Speed Train

With the large-scale development of high-speed railway of the "Twelfth Five-year" plan,and "Thirteenth Five-year" plan has started.The plan has played a great promotion on the construction of China’s high-speed train.With the increasing speed of high-speed train,has made tremendous contributions to people travel and the economics of our country.The aerodynamic problems are becoming more and more important.When the train through the complex conditions at high speed.It caused the complex flow field outside of the train.The changed enters the carriage by the fresh air inlet and body gaps,causing the microenvironment changes and adverse effected on passengers.In order to research and analysis the interior flow field changes when train running in open air and in tunnel,this paper takes a certain type of CRH high speed train as the research object.The main research content of the following aspects:1.Building an 1:1 entire geometry model for compartment and air-conditioning stem of high speed train.Then the model was divided into meshes in ANSYS ICEM.Then determine the boundary conditions and recommend the evaluation for flow field.2.Using ANSYS FLUNET simulation the summer and winter environment when the train running at speed of 300km/h and 350km/h,and then research and analysis the results.3.Using ANSYS FLUNET simulation when the train running at speed of 300km/h and 350km/h crossing through different length tunnels,setting up and storaging monitor points for pressure,temperature,wind speed,then research and analysis the results.4.Combined with simulation results and real train test,briefly introducing the interior flow field test methods of high speed train.Through simulation different conditions of high speed train.This paper study the impact of the indoor air environment when the changes of the fresh air inlet.Theoretical analysis and simulation results showed that:1.the open air speed at 300km/h and 350km/h,interior air pressure maintain a certain positive values,when 300km/h pressure between 26～27.5pa,when 350km/h pressure between 21.5～22.5pa.The temperature between 297～299K in summer,and the temperature between 293-295K in winter.The changes of wind speed inside compartments less than 0.5m/s,but the wind speed is relatively large at both ends and aisle of the train,so there will be a sense of hair.2.The interior pressure change trend is consistent with the fresh air inlet when the high speed train through the tunnel.When the high speed train through the different length of the tunnels at same speed.The peak to peak value of fresh air inlet and interior pressure fluctuations showed a clear downward trend and the temperature and wind speed showed a slight downward trend with increasing length of the tunnel.When the high speed train through the same length of the tunnel at different speed.The peak to peak value of fresh air inlet and interior pressure fluctuations showed a clear upward trend and the temperature and wind speed showed a slight upward trend with increasing speed of the high speed train.