某地铁车辆空调送风道出风性能仿真优化及分析

Optimization and Analysis of Air Outlet Performance of Certain Metro Vehicle Air-conditioning Duct

运用计算流体力学方法,通过仿真模型对某地铁车辆送风道出风均匀性进行检验与优化,得出在较小风道阻力下较为合理的静压挡板高度、位置及尺寸。研究发现,添加不同形式的挡风板可改变风道送风前端出风量,进而优化出风均匀性。主风道模型的阻力调节板高度为90 mm且距出风口边缘30 mm时,出风均匀性较好;扁风道模型的开孔挡板高度40 mm且距出风口边缘15 mm;考虑到扁风道末端渐缩段的影响,添加了3块高度分别为40 mm、30 mm、20 mm的末端挡板,可改善出风口出风量中部位置小、末端大的状况,使扁风道出风口的出风量趋于均匀。

Adopting CFD method,simulation model is used to test and optimize certain metro vehicle air duct uniformity,and reasonable static pressure baffle height,position and size under relatively small air duct resistance are obtained.Study found that using different types of baffle changes air outlet volume at air duct front-end,thus air outlet uniformity is optimized.When baffle height of main duct model is 90 mm,being 30 mm away from outlet edge,air outlet performs good uniformity.For flat duct model with baffle height of 40 mm,being 15 mm away from the outlet edge,considering the impact of air duct flat end tapered section,three back-end baffles of height 40 mm,30 mm,20 mm are added respectively,to improve the situation where air outlet is too small in the central position,and is too large at back-end,encouraging uniformity of air outlet in flat air duct.