Abstract:

Based on the heat transfer mechanism of the turbocharger turbine box, a fluid mesh model and a solid one for simulation were  built by using the professional software CFD and FEM respectively. The multiple coordinate system of rotation in the fluid domain was established to calculate accurately the flow field of turbine boxes, heat transfer coefficient and temperature. Coupled heat transfer analysis of the turbocharger turbine box was carried out by the fluid-solid coupling method, and then the temperature field for solid areas was obtained. Based on the temperature,its thermal stress analysis was carried out. In comparison with the experiments, the temperature distribution of the simulation model accords with that of the realistic turbocharger turbine box, the maximum deviation is only 3.3%. The coupled heat transfer model for the turbocharger turbine box has a high accuracy, which provides the basis for better design of turbocharger turbine.

Key words: turbine box, coupled heat transfer, temperature field, thermal stress

摘要：

基于涡轮增压器涡轮箱传热机理，采用专业CFD软件和FEM软件分别建立了涡轮箱流体区域和固体区域网格仿真模型。在流体域建立多重旋转坐标系，精确计算出涡轮箱流场、壁面传热系数及温度。应用流固耦合的仿真方法对涡轮箱进行耦合传热分析，得到涡轮箱固体域的温度场并对其进行热应力分析。与实验结果对比发现，仿真模型的温度场符合实际涡轮箱温度分布，最大误差仅为3.3%。该涡轮箱耦合传热模型具有较高的精度，为涡轮增压器的设计优化提供了依据。

关键词: 涡轮箱, 耦合传热, 温度场, 热应力