A型地铁空调系统及客室内流场数值分析

为给目前国内A型地铁车辆的舒适度设计提供理论参考,针对地铁车辆静压风道结构特点,基于k-ε两方程湍流模型和SIMPLE算法,建立包含空调送风风道和客室的三维计算模型.对计算模型的空气流动和传热状况进行CFD数值计算.计算过程综合考虑车体壁面传热和人体散热等多种传热.分析计算结果得到客室内温度场和速度场的分布规律,并对空调通风设计方案进行量化评估.计算结果表明:客室内人体头部区域温度场分布均匀,平均温度为26.6℃,最大温差为6℃;车厢内有较理想的气流组织形式,速度分布范围为0.50~0.79 m/s,而且客室端部和中部区域人体头部周围速度较大.将计算结果与欧洲EN 14750-1标准进行对比分析,认为乘客的舒适性较好.

Numerical simulation on air conditioning system and flow field of passenger compartment of type A subway

To provide a theoretical reference for the comfort design of the current type-A subway vehicle in China, according to the structure characteristics of the static air supply duct of a subway vehicle, a 3D calculation model with air conditioning duct and passenger compartment is built on the basis of the turbulent model of k-ε two equations and SIMPLE algorithm. The CFD numerical calculation is performed on the air flow and heat transfer situation of the calculation model. The effect of the car body wall heat transfer and the passenger body heat dissipation are taken into account. The calculation results are analyzed and the distribution rule of temperature field and velocity field in passenger compartment is obtained, and the air conditioning ventilation design scheme is quantitatively evaluated. The calculation results show that, the temperature field of human head position is well-distributed, and the average temperature is 26.6 ℃ and the maximum temperature difference is 6℃ ; the airflow form in compartment is ideal and the velocity distribution range is 0.50 -0.79 m/s, and the air velocity on human head is higher in the two ends and the middle of compartment than any other domain. The comparison of thecalculation results with the European standard EN 14750-1 indicates that the comfort degree is good.