活塞隔热性能有限元分析及试验验证

采用有限元计算方法和试验验证相结合对某复合隔热结构活塞的隔热性能进行了研究.首先基于性能仿真计算及经验公式确定了活塞换热边界条件，然后利用有限元热分析方法得到了该活塞的温度场及热流分配模型，并探讨了复合隔热结构活塞热流分配模型发生变化的原因.最后通过复合隔热结构活塞温度场模拟试验对活塞的隔热性能进行了试验验证.研究结果表明，隔热垫、气隙等隔热结构提高了活塞的热、机载荷承载能力，活塞隔热度超过了60%；复合隔热结构活塞温度场模拟试验结果与有限元计算结果之间误差在5%以内，说明有限元计算结果具有很高的工程参考价值. 

Finite Element Analysis and Experimental Verification of Heat Insulation Performance of Piston

The heat insulation performance of a new heat insulated piston was studied based on finite element analysis and experimental verification. Firstly, the heat exchange coefficient of the piston was determined by means of performance simulation calculation and empirical equations. Secondly, the temperature field and the heat flux distribution model were obtained using finite element thermal analysis. And the changes of heat flux distribution model were also discussed for the piston with compound heat insulation structure. Finally, the heat insulation performance of the piston was verified by the temperature field simulation test. The results show that the heat insulation structures, such as heat insulation pad and air gap, can greatly improve the heat and load carrying capacity of the piston. And the heat insulation degree of the piston can exceed 60%. The error between the simulation results and the finite element calculation results is within 5%, which indicates that the finite element calculation results have high engineering reference value.