汽车前舱散热性能的仿真与优化分析
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摘要
为了改善某MPV车型前舱的散热性能,针对该车型建立了前舱有限元模型,采用CFD软件对其整车流场及温度场进行数值仿真分析,综合比较了高速工况下冷却模块在CRFM(condenser,radiator,fan power train cooling module)和CFRM(condenser,fan,radiator power train cooling module)这两种布置方式对汽车散热性能的影响,并分析了风扇与散热器之间的间距对散热性能的影响。研究结果表明,CRFM布置下发动机前舱热量分布更均匀,散热效果更好;适当增大风扇与散热器两者之间的间距能显著提升前舱的散热性能,风扇与散热器之间存在一个最优距离。
In order to improve the heat dissipation performance of a MPV,a finite element model for the vehicle underhood is built. A numerical simulation on the flow field and temperature field of the vehicle is conducted by using CFD softwares. A comparison between CRFM(condenser,radiator,fan power train cooling module)layout and CFRM(condenser,fan,radiator power train cooling module)layout,together with the influence of the distance between radiator and fan,are simulated and analyzed under high speed condition. The results show that the heat dissipation performance is better in CRFM layout. And the heat dissipation performance can be improved by increasing the distance between radiator and fan,and there is an optimal distance between radiator and fan to get the best heat dissipation performance.
In order to improve the heat dissipation performance of a MPV,a finite element model for the vehicle underhood is built. A numerical simulation on the flow field and temperature field of the vehicle is conducted by using CFD softwares. A comparison between CRFM(condenser,radiator,fan power train cooling module)layout and CFRM(condenser,fan,radiator power train cooling module)layout,together with the influence of the distance between radiator and fan,are simulated and analyzed under high speed condition. The results show that the heat dissipation performance is better in CRFM layout. And the heat dissipation performance can be improved by increasing the distance between radiator and fan,and there is an optimal distance between radiator and fan to get the best heat dissipation performance.
引文
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[2]Yang Z,Bozeman J,Shen F Z.CFRM concept for vehicle thermal system[J].2002.
[3]Yang Z,Bozeman J,Shen F Z.CFRM concept at vehicle idle conditions[J].2003.
[4]胡文成,王良模,邹小俊.风扇布置对载货汽车散热性能的影响[J].汽车技术,2014(10):22-27.(Hu Wen-cheng,Wang Liang-mo,Zhou Xiao-jun.Influence of fan arrangement on truck heat dissipation performance[J].Automobile Technology,2014(10):22-27.)
[5]秦岭,苏小平.直列六缸发动机进气歧管CFD分析及优化[J].机械设计与制造,2015(11):211-214.(Qin Ling,Su Xiao-ping.The CFD analysis and optimization of straight six engine intake manifold[J].Machinery Design&Manufacture,2015(11):211-214.)
[6]傅立敏.汽车空气动力学[M].北京:机械工业出版社,2006.(Fu Li-min.Vehicle Aerodynamics[M].Beijing:China Machine Press,2006.)
[7]王森,刘振侠,黄生勤.FLUENT在汽车外形设计中的应用[J].机械设计与制造,2005(4):71-73.(Wang Sen,Liu Zhen-xia,Huang Sheng-qin.The application of fluent software in the car styling[J].Machinery Design&Manufacture,2005(4):71-73.)
[8]沈凯,徐锦华,朱黎明.发动机冷却模块安装参数对气动性能的影响[J].内燃机工程,2013(1):27-32.(Shen Kai,Xu Jin-hua,Zhu Li-ming.Influence of installation of cooling components on aerodynamic characteristics[J].Chinese Internal Combustion Engine Engineering,2013(1):27-32.)
[9]李传峰.某新车型发动机舱热管理的研究与改进[D].上海:上海交通大学,2013.(Li Chuan-feng.Study and improvement of underhood thermal management of a new vehicle[D].Shanghai:Shanghai Jiaotong University,2013.)
[10]李毅,董琳,张延静.电子风扇与散热器距离匹配的试验研究[J].装备制造技术,2012(9):3-4.(Li Yi,Dong Lin,Zhang Yan-jing.Experimental research on the distance of electronic fan and radiator[J].Equipment Manufacturing Technology,2012(9):3-4.)