摘要
高速列车运行过程中空调系统冷凝风量会出现下降趋势,导致空调散热困难甚至停机。基于三维非定常不可压缩雷诺时均N-S方程,采用k-ε湍流模型和DDES方法,研究导流板高度对冷凝风量的优化效果,同时分析了不同导流板高度下阻力的变化规律。研究结果表明:在出风口外侧安装锲状导流板对缓解冷凝风量随车速快速下降的情况有显著效果。导流板通过改变出风口处流动结构,扬起车侧的高速气流形成负压区,达到缓解风量下降的目的。导流板高度直接决定了冷凝风量的大小,导流板越高,冷凝风量越大,但同时也会带来阻力增加的问题。综合考虑,导流板高度取45 mm即可有效改善冷凝风量下降的问题,同时阻力增幅相对较小。
During the operation of high-speed trains,the condensing air flux of the air-conditioning system can decrease sharply,which leads to the cooling efficiency decreasing of the air-conditioning system,and sometimes even the system shutdown due to the overheating issue.In this study,the condensing air flux under different deflector heights were investigated using the three-dimensional unsteady incompressible ReynoldsAveraged Navier-Stokes equations together with the k-ε turbulence model and the DDES method.In the meantime,the resistance variation under different deflector heights were analyzed.The results show that the deflectors installed outside the condensing outlet have a significant effect on alleviating the rapid decrease of condensing air flux with the increase of the train speed.By changing the flow structure outside the condensing outlet,the deflector induces high-speed flow on the side of the train to form an area of negative pressure so as to alleviate the decrease of the air flux.The height of the deflector directly determines the condensing air flux,with higher deflector generating larger condensing air flux but also higher resistance.Overall,a 45 mm high deflector can effectively improve the condensation air flux decreasing situation while induce relatively small amount of resistance.
作者
李雪亮
伍钒
王田天
陶羽
徐任泽
LI Xueliang;WU Fan;WANG Tiantian;TAO Yu;XU Renze(State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China;School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China;Joint International Research Laboratory of Key Technologies for Rail Traffic Safety,Changsha 410075,China)
出处
《空气动力学学报》
CSCD
北大核心
2022年第6期155-162,共8页
Acta Aerodynamica Sinica
基金
国家铁路集团科技研究开发计划重大课题(K2020J003)
国家数值风洞工程(NNW)。
关键词
高速列车
空调
冷凝风量
导流板
分离涡仿真
high-speed train
air conditioner
condensing air flux
flow deflector
detached eddy simulation
