The Distribution Of Dust Particles In The Train Under Condition Of Accelerating State

Railway-transportation,as one of the main land-transportation mode,has made great contributions to China’s economic and social development,at the same time,the rapid development of high speed train travel brings people great convenience shortens peoples’ travel time,save travel costs.Along with the social economy rapid development and the continuous improvement of living standards,people have a good living environment for higher health requirements and expectation,the good air-quality in high speed train is one of most concerns that people pay close attention to.Especially in recent years,the index PM2.5,which measures the air quality,has continuous surges in records,sparks peoples’ concerns and care over atmospheric environmental dust condition.For the relatively closed space high-speed train carriages,the outside dust can get into the inner through the inlet of the air-condition system,in addition,the passengers’ getting up and down the train can take along little dust particles inside the train,dust particles must inevitably bring certain influence to the inner air quality,how dose the dust particles influence the inner air and the effect to this influence caused by the running state of the train is also worth research and studying.In this paper,based the most widely used in the application of fluid mechanics numerical calculation method---the finite element method,three dimensional N-S equation of viscous fluid with the two-equation k-ε turbulent model,Lagrange discrete phase model(DPM),many numerical simulations of the dust particles distribution inside of train has been carried out and analyzed,providing many constructive suggestions to the arrangement of the fresh air inlets and outlets which belong to the air conditioning system of high-speed railway carriage.The main research work has the following several aspects :first of all,the dust particles distribution in the car at the train running speed of 210km/h has been laid out,and the dust particles concentration changes along with the time the train runs curved;second,under the condition of different acceleration on the direction of train running speed,the dust concentration and particles location of the front part,middle part and the rear part changes along with the running time has been figured out;finally,combining with the actual train running status,reasonable suggestions are put forward to on dust removal program.The results show that reasonable air supply is key to guarantee to the dust particles distribution inside of the train.