涡轮增压器轴承体耦合传热的数值仿真

基于涡轮增压器轴承体冷却机理,采用专业CFD软件和FEM软件分别建立了轴承体流体区域和固体区域网格仿真模型.运用流固耦合的仿真计算方法对涡轮增压器轴承体进行耦合传热分析,得到轴承体流体区域的流场、换热系数及温度场,并分析轴承体固体区域的温度场.仿真结果表明:机油和水同时冷却方式下,轴承体温度分布较均匀,其冷却性能较好.与实验对比,仿真模型的温度符合实际轴承体温度分布,证明了此方法的可行性,为轴承体冷却性能的设计优化提供依据.

Numerical Simulation on Coupled Heat Transfer of Turbocharger Bearing

Based on the cooling mechanism of the turbocharger bearing, a fluid mesh model and a solid one for simulation were built by using the professional software CFD and FEM. Numerical simulation of the coupled heat transfer of the turbocharger bearing was carried out in the fluid-solid coupling method. And then, the data of flow field, heat transfer coefficient and temperature field for fluid region of bearing was obtained, and the temperature field for solid areas was analyzed. The simulation results show that the temperature distribution of the bearing is more uniform, resulting in better cooling performance under the cooling way by using both oil and water at the same time. The experiment shows that the temperature distribution of the simulation model accords with that of the actual turbocharger bearing, which proves the feasibility of this method.