空调列车室内气流组织的三维数值模拟

3-D Numerical Simulation of Air Distribution in Air-Conditioned Railway Passenger Compartment

用传统的模型试验或通过经验公式求解射流的方法,所获得的列车车内气流组织的结果是不太精确的,利用数值模拟的方法计算空调列车室内气流组织已被广泛应用,但通常计算时没有考虑太阳辐射引起室内负荷的再分配的问题,从而使计算结果具有较大的局限性。本文首先由Monte Carlo和Gebhart方法计算出了太阳辐射室内负荷的再分配,并以此为基础建立了空调列车气流组织数值模型的边界条件。采用k ε双方程模型作为控制方程进行了数值求解,与实验结果对照表明,数值计算所建的物理和数学模型及简化措施是合理的。

Using traditional model test or experience formula to solve jet question,the got result of the air follow in air-conditioned train is some coarse,so the numerical simulation method is used abroad in the calculation,but the heat load redistribution on the surface of the sun radiation is usually reckoned and the result is limited.Firstly,Monte-Carlo method and Gebhart method are used to compute the heat load redistribution of the sun radiation in every wall,then the boundary conditions for numerical model of the airflow organization of air-conditioned train are established,at last,the numerical simulation is carried out by using k-ε double equation model as control equation.Compared with test result,it is proved that established physical and mathematical models are reasonable.