Research on optimized design of air supply duct for subway train air conditioning
The performance of the air supply duct,a crucial component of subway trains,significantly influences passenger com-fort.Therefore,optimizing the structure of the air supply duct to enhance air supply uniformity has become an urgent concern.This study focused on improving indicators such as air supply volume,uniformity and noise through the optimization of the air supply duct structure based on theoretical design and computational fluid dynamics(CFD)simulation verification.First,to meet low noise requirements in the passenger compartment,the average outflow speed of the waist-shaped hole for converting dynamic pressure to static pressure was con-trolled at 5 m/s.Next,theoretical calculations of relationship between dynamic pressure and static pressure were conducted to control the dynamic pressure in the dynamic pressure chamber and the static pressure difference between the dynamic and static pressure chambers,ensuring air supply uniformity.Unlike traditional air duct structures with equal-width dynamic pressure chambers,the optimized air sup-ply duct had a reduced diameter structure in the dynamic pressure chamber,which could improve air supply uniformity.To verify the ac-curacy of the theoretical design method,CFD calculation software was employed to analyze the flow field simulation of the theoretically designed optimized air duct structure.The optimized air duct model and the original air duct model were both incorporated into the same passenger compartment model,and the simulation results of the two coupled models were compared and analyzed.The findings demon-strate that the air supply uniformity of each waist-shaped hole in the optimized air duct structure was controlled within 20％,significantly improving the air speed distribution in the passenger compartment.This further validated the effectiveness of the theoretical calculation and optimization method,providing valuable guidance for the engineering application of air conditioning ducts.
万方数据
维普
