Quality Analysis On Air-Conditioning System And Compartment Of High-Speed Train

As the continual development of high-speed train, trains with speed above300km/h are extensively operated. High-speed train has bring great convenience for person’s quick trip and changes person’s lifestyle. With increasing of velocity, problems of aerodynamic turned to be more and more prominent, it not only influence safety of train but also riding comfort of passengers. In order to meet requirements of riding comfortableness, the design of air-conditioning system is analysed from two aspects:1. Compare to the analysis of CRH2high-speed, the analysis of CRH3on thermal environment in high-speed train is not mature, there are many differences between CRH3and CRH2, including air-conditioning and the mode of air supply, whether the air-conditioning of CRH3can meet requirements of riding comfortableness is need to be studied. The distributions of air velocity, temperature and CO2volume concentration in compartment are calculated in summer and winter, then analyse the air-conditioning and the mode of air supply by comparing with the result of CRH2.2. Pressure-waves produced as trains traveling through tunnel and even passing by each other in the tunnel can transfer into compartment via fresh air inlet, and make pressure-indoor changed, and then induce uncomfortable feeling of passengers seriously, at this time, the function of ventilating fan for resisting external pressure-pulse is important, what kind of air-conditioning system can resist external pressure-waves and make passengers comfortable is a problem need to be seriously studied. In order to analyses the influence of ventilating fan for resisting the external pressure-pulse of high-speed trains, numerical simulation method was used to analyses the pressure change in carriages installed two kinds of ventilating fan(speed-fixed fan and frequency-convertible fan). Some results of pressure-pulse in carriage at different running speeds of train were obtained. Based on the calculation results, the passenger comfortableness was evaluated according to <Testing standard of high-speed electric trains(tentative version)>. The results show that frequency-convertible fan is better than speed-fixed fan for resisting pressure-pulse produced by external pressure change.