耦合法用于柴油机冷却系统传热的研究

在研究柴油机冷却系统的流动和传热问题时，边界条件的确定往往成为难点。该文将某六缸柴油机活塞-缸套-冷却液-机体组成一个固流耦合传热系统进行整体传热仿真计算，解决了单独研究固体部件和流体传热时无法确定其边界条件的问题；通过缸套内壁轴向一些试验测点温度的计算值与实测值对比，研究了网格对模拟计算精度的影响；在结合了计算资源与计算精度的条件下，仿真计算得到冷却系统温度场分布、流场分布、压力损失等信息，这些信息对柴油机的设计具有指导意义。

Heat transfer in diesel engine cooling system using coupled method

In the research on flow and heat transfer of the diesel engine cooling system, the boundary condition is often difficult to be determined. The paper made a whole heat transfer modeling calculation for solid-fluid coupled system which contained the piston-liner-coolant-cylinder body in a six-cylinder diesel engine, which could omit the definition of the boundary condition when they were calculated separately. Comparison the temperature between calculated results and measured values at some spots along with the axis direction on cylinder face was made, and the influence of simulation precision with different grids density was studied. Considering the computer resources and calculation precision, temperature field, flow field and pressure field of cooling system were obtained through simulating, which could provide guidance for engine design.