摘要
汽车发动机舱的热管理不仅影响其工作性能,也影响汽车动力性、安全性、可靠性、排放性及燃油经济性等。新能源汽车的发动机舱散热设计也非常关键。传统CFD分析可以较准确的模拟对流换热,但分析热辐射时有收敛等困难。本文针对发动机舱进气与部件温度分布两方面内容进行了研究:首先通过外流场分析方法引入多孔介质、旋转参考坐标等方法进行高精度的机舱流场仿真;其次将现有的CFD软件和热分析软件RadTherm结合起来,建立了一套耦合的热流耦合方法,在有效提高热辐射和流动分析效率的同时,保证计算精度满足工程要求,从而为机舱热保护设计提供有效地指导。
The traditional vehicle underhood thermal management directly influenced the performance of engine and components in underhood,and then influenced the power,safety,reliability,emission and fuel economy of the vehicle.For green car thermal design is an essential part of good cooling air intake to ensure good heat dissipation.Details of flow field determines the surface temperature of the components of a direct impact on whether the underhood components to work properly.Traditional CFD analysis can be more accurately simulate convection heat transfer,but in consideration of heat radiation,would cause convergence difficulties,the calculation period is too long.In this paper,the front-end flow and component temperature distribution two aspects were studied.First,highly accurate flow field simulation front-end flow analysis introduced through porous media,rotating reference frame and other methods.Secondly,combine CFD software and thermal analysis software RadTherm established a set of coupling analysis,the effective thermal radiation and flow analysis to improve efficiency while ensuring the accuracy to meet the engineering requirements,so as underhood thermal protection designed to provide effective guidance.
出处
《工业技术创新》
2016年第3期322-328,共7页
Industrial Technology Innovation
关键词
新能源汽车
机舱热管理
冷却进气
热保护
耦合分析
Green Car
Underhood Thermal Management
Cooling Air Intake
Thermal Protection
Coupling Analysis
