基于CFD的发动机冷却水套共轭传热分析

Conjugate Heat Transfer Analysis of Engine Cooling Water Jacket Based on CFD

以某发动机冷却水套为研究对象,采用CATIA构建了试验样机的三维模型,在对物理模型、实验数据测取及边界条件分析的基础上,利用流体分析软件STAR-CCM+进行流动与传热的流固共轭传热分析,得到了冷却水套内流场分布和传热特性。研究表明:仿真结果与实验测试结果较接近,CFD计算结果可靠;整体流速分布较均匀,不存在流动死区,且水套平均流速均大于0.5 m/s,满足冷却水套的最低流速设计准则。热负荷较高的区域具有较大的流速和传热系数,有利于该区域散热。本研究可为冷却水套样机结构改进及冷却性能优化提升提供仿真数据及理论参考。

An engine cooling water jacket is selected as the research object,and the 3 D model of water jacket prototype is created by CATIA.On the basis of physical model,the experimental data measurement and boundary condition analysis,the fluid-solid conjugate heat transfer analysis of flow and heat transfer is carried out by fluid analysis software STAR-CCM+,and the flow field distribution and heat transfer characteristics in the cooling water jacket are obtained.The results show that the simulation results are close to the experimental test results,the CFD calculation results are reliable;the overall velocity distribution is relatively uniform,there is no dead flowing zone,and the average velocity of the water jacket is greater than 0.5 m/s,which meets the minimum velocity design criteria of the cooling water jacket.The region with higher heat load has larger flow rate and heat transfer coefficient,which is conducive to heat dissipation in this region.The research can provide simulation data and theoretical reference for the structure improvement and cooling performance optimization of cooling water jacket prototype.