基于缸内燃烧分析的发动机金属温度场计算方法

为了提高发动机缸盖、缸体金属温度场分析的准确度,提出了一种基于缸内燃烧分析的发动机金属温度场分析方法。首先,基于发动机的标定信息,进行了缸内的燃烧分析,研究了各部分边界上的对流传热量;其次,进行了水套的流动分析,对其传热系数进行了评估;再次,考虑了活塞环与缸壁的摩擦换热及活塞与缸壁的热传导;最后,基于上述的热边界条件进行了金属温度场的计算,并与试验进行了验证。结果表明:采用该算法,缸盖、缸体金属温度场分布比较合理,监测点温度与试验比较吻合。

Engine Metal Thermal Analysis Method Based on In Cylinder Combustion Analysis

In order to improve the accuracy of engine head and block metal thermal analysis, a thermal analysis method based on the in-cylinder combustion analysis was put forward. First, the in-cylinder combustion analysis was performed to research convections according to the engine calibration. Then, the water jacket flow analysis was done to evaluate heat transfer coefficient. Next, the friction between piston rings and liner and the conduction between piston and liner were taken into account. Finally, the head and block thermal analysis was done based on the above thermal boundary conditions. The result shows that with the proposed method the head and block temperature ranges and distributions are very reasonable, and the temperatures show good consistency at the monitor points in the simulation and test.