In the paper , in accordance with the thermal power torpedo propulsion system using hap tri - component fuel , with the i - deas software , applying the cad technology and the fem , the research of simulation on the piston - one of key parts of engine was proceeded and the paper presented the whole analysis process of the piston including thermal analysis . in the paper , the question of the boundary condition in the complicated engineering was explored and the temperature field . the stress field and the deformation of the piston were computed and analyzed under a new kind of fuel ( hap ) 本文针对三组元鱼雷热动力系统，应用i - deas软件，利用cad技术和三维有限元方法( fem ) ，对发动机的关键零件? ?活塞展开仿真研究，对活塞进行了包括热分析在内的全过程的仿真计算，探索了复杂工程中边界条件的处理问题，分析计算了鱼雷发动机活塞在新型燃料(三组元燃料)工作下的稳态温度场、应力场与变形情况，最后，根据分析结果对其结构提出了改进意见。
