The Simulated Research Of Air Distribution On Air-conditioning Train

With the sixth time of Chinese railway speed up, the passengers bring forward higher request to the comfort of riding in the air-conditioning train.But there still have a gap between air quality and people's expected value,mostly in long air age,bad PMV,affect the comfort of passengers.Because different ventilation mode and positon of give-eject draught can cause different air distribution, so the thesis use simulated method to study the hybrid,perforated-panel,displacement ventilation using in the train, aiming at provide a reference to the improvement of the present train's air-conditioning system.The thesis choose passenger seat,sleeping and standing posture to study according to the Railway Standard,reflet the people-oriented design idea.Owing to the software Airpak has speedily model build function, powerful solver, post-processing demonstrate function and short of experiment condition, so the thesis use this software to do simulation on different ventilation of 25T soft sleeping car.Firstly, predigest the model;after that, quoting the documenting experiment data to test the reliability of simulating method.Above the basis,make numerical simulation on hybrid, perforated-panel and displacement ventilation of the car, change the given wind's temperature and velocity to study,on the same time, analyze and contrast the PMV value and the MEAN AIR AGE value of the typical sections with different ventilation parameters,find out the excellent parameters of air supply.In the end, compare the three ventilations in the way of temperature and velocity distribution, the indoor air quality and energy saving, obtain many beneficial conclusions.It is feasible that use numerical simulation to analyze and evaluate the air distribution in the high-speed train.This thesis calculate different given wind's parameters of three ventilations,obtain the optimal parameters.Compare to hybrid ventilation,the displacement ventilation have the merit of high giving wind temperature, good air quality and less energy consume.Displacement ventilation has the minimum air age value at the height of 0.5m, just corresponding to the down bunk passenger's sleeping location,and give out suggestion to passenger's sleep posture.