基于有限元法的活塞-缸套-冷却水系统固流耦合传热研究

发动机活塞-缸套-冷却水组成的固流耦合传热系统涉及固体部件传热以及计算流体力学问题。确定此系统的内部边界条件成为发动机传热研究的难点。因此采用耦合分析方法将固体部件和流体部分作为一个整体进行研究。将活塞、缸套、冷却水系统内边界定义为wall边界，计算时自动在相耦合的两个体之间传递热交换条件，无需再进行单独定义，从而计算时可只定义系统外部边界条件。在进行有限元固流耦合传热计算方法研究基础上针对某6130发动机中活塞-缸套-冷却水系统进行数值仿真，所得结果相对试验结果有较高精度。

FEA Based Piston-Liner-Coolant System Fluid-Solid Coupling Heat Transfer

The piston-liner-coolant system of engine is a fluid-solid coupled, which includes solid heat transfer problem and computational fluid dynamics problem. How to confirm the internal boundary condition is a difficulty for above fluid-solid coupling heat transfer system. This paper utilized coupling analysis method to study the whole system which included the solid parts and fluid, defined the internal boundary for the fluid-solid coupling system as a wall boundary which could automaticaly transfer the heat boundary condition. So there were only demanded exterior boundary conditions for simulation. This method was adapted to numerical simulation, which was used in 6130 diesel engine piston-liner-coolant system. Calculating results with this method and measuring values were very well accordant.