市域车客室空调通风系统仿真与优化研究

Simulation and optimization of air conditioning and ventilation system inan urban train passenger room

以某市域车客室空调通风系统为研究对象,提出了将客室、送风系统、回风系统、废气排风系统和新风系统整体耦合的新仿真模型,使仿真边界条件设置贴合实际工程。利用ANSYS Fluent软件,对市域车空调通风系统的气流组织和传热状况进行了仿真计算与优化。结果表明:优化前2台空调机组4个回风口的回风量分别为0.24、0.26、0.35、0.19 kg/s,回风量分布不均匀;废气排风道过于窄小,导致废气排风系统阻力高达629 Pa。鉴于此,对客室回风结构与废气排风结构进行了优化研究,优化后最大回风量与最小回风量仅相差0.05 kg/s,客室到废气排风出口流动阻力降低至120 Pa。客室内大部分区域温度范围为24~26℃,客室内部人员主要活动范围处于微风速,乘坐舒适性提升显著。本研究可以为市域车空调通风系统的优化设计提供依据。

Taking the air conditioning and ventilation system for a passenger room in an urban train as the research object,this paper presents a new simulation model which combines the passenger room,supply air system,return air system,exhaust air system and outdoor air system,and makes the simulation boundary conditions fit the actual project.By using ANSYS Fluent software,the air distribution and heat transfer of air conditioning and ventilation system in the urban train are simulated and optimized.The results show that the return air volume of four return air outlets of two air conditioning units before optimization is 0.24,0.26,0.35,0.19 kg/s,respectively,and the distribution of return air volume is not uniform.The exhaust air duct is too narrow,resulting in the exhaust air system resistance up to 629 Pa.In view of this,the return air structure and exhaust air structure of the passenger room are optimized.After optimization,the difference between the maximum and minimum return air volume is only 0.05 kg/s,and the flow resistance from the passenger room to the exhaust air outlet is reduced to 120 Pa.The temperature range of most areas in the passenger room is 24 to 26℃,and the main activity range of the personnel inside the passenger room is at the breeze speed,and the comfort is significantly improved.This study can provide a basis for the optimal design of the air conditioning and ventilation system for urban trains.