试验与仿真相结合的发动机活塞热负荷分析

借助硬度塞温度测试、数值分析手段,结合对改进前活塞的温度场和热应力的计算,对发动机改进后活塞的热负荷状况进行评估.通过计算活塞传热边界条件,利用有限元分析软件,对活塞进行温度场计算,然后利用试验实测数据对其进行标定,在计算误差小于5%的情况下,得到改进前与改进后活塞在A工况和B工况下的温度场分布,最后进行了对应工况的热应力计算.结果表明在相同工况下发动机改进后活塞最高温度均比改进前活塞低,最大热应力比改进前活塞小.在改进前活塞满足热负荷要求的前提下,改进后活塞满足热负荷要求.

Thermal Load Analysis of Engine Piston Combined Experiment with Simulation

In order to investigate the thermal load distribution of modified piston, it is necessary to analyze temperature field and thermal stress combined simulation with experiments. The FE software was used to simulate the temperature field of the piston after the boundary conditions of thermal transfer were calculated, and then, the results were verified according to experiment data, and the error of calculation was less than 5%. Finally, temperature field and thermal stress were derived under different operating conditions including conditions A and B. The results of investigation show that the maximum temperature and maximum value of thermal stress of modified piston decrease compared with the original piston. The modified piston meets the demand of thermal load based on the original piston meeting the demand of thermal load.