混合动力汽车用DC-DC和IPU散热结构优化

针对混合动力汽车用DC-DC和IPU的已有散热结构散热效果差,导致DC-DC和IPU在使用过程中温升高,从而影响混合动力系统的稳定性和可靠性的问题,根据传热学的质量、动量和能量守恒方程,建立DC-DC和IPU散热结构的三维非稳态散热模型,采用计算流体力学(CFD)方法,对DC-DC和IPU散热系统的流场和温度场进行数值模拟仿真分析。在此基础上,根据传热学理论设计了DC-DC和IPU散热结构的优化方案,并对优化方案的散热效果和温升进行了仿真分析与实验研究,结果表明该优化方案实现了DC-DC和IPU的良好散热,有效降低了温升,满足了混合动力汽车对DC-DC和IPU的使用要求。

Heat dissipation optimization of DC-DC and IPU for hybrid electric vehicle

Due to the bad heat dissipation of the existing heat dissipation structure of DC-DC and IPU for hybrid electric vehicle(HEV), the temperature of DC-DC and IPU will rise during the running process, which in turn decreases the stability and reliability of the hybrid electric system. Aiming at this problem, a three-dimensional, transient heat dissipation model is built for DC-DC and IPU heat dissipation structure based on the mass, momentum and energy conservation equations. By using computational fluid dynamics (CFD) software, flow field and temperature field of DC-DC and IPU heat dissipation structure are numerically simulated. Based on the simulation, and combined with heat transfer theory, an improvement scheme of heat dissipation structure is proposed. The simulation results and experiment results of thermal performance and temperature rise show that the improvement scheme can improve the thermal performance, and decrease the temperature rise of DC-DC and IPU effectively, thus satisfy the application requirements in HEV.