The Numerical Simulation Of The Train's Air-conditioning Ventilation System

As the development course of our country's high speed train, the assistant equipment's technology of it must adapt the development. The working time of the air-conditioning train is always long, the passengers always feel the situation of tiredness,dizziness,thirst and chest distress , etc, all of these are caused by the foul air of the carriage. So improve the air conditioning system of the carriage, make it provide the high quality air for the passengers has the important realistic meaning.The development of the computer and computational fluid dynamics (CFD) provide the condition for the widespread using of the three-dimension numerical simulation. At the present using the CFD simulation has become the important method to realize the interior flow situation of the fluid mechanical. This article make the numerical simulation of the train's interior flow field and make the contrast certification by considered multiform elements, get the result of the effects in the train which caused by the air moisture content and the heat and moisture that distributed by the passengers, make the reference of the air-conditioning ventilation system's design by the using of the numerical simulation.At first this article constitute the geometry model of the air-conditioning train and make the division of the mesh, and then make the numerical simulation of the existing train's air-conditioning ventilation system, observe the air-flowing and temperature distribution by the result of the simulation, find out the place which need the improvement. Make the optimization for the structure of the existing train, analyze the result of optimization, and certificate the stand or fall of the improvement case. Make the numerical simulation of the carriage's temperature under the different external temperature, and make the contrast of the carriage's temperature variation which caused by the heat emission from the external. Considered multiform elements'effect to the air condition of the carriage, such as the air moisture content, the heat and moisture emission of the human behavior, make the numerical simulation of the air-conditioning ventilating system under various conditions, realize the effects of the carriage's air condition by various elements.