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 ) 本文針對(duì)三組元魚(yú)雷熱動(dòng)力系統(tǒng),應(yīng)用i - deas軟件,利用cad技術(shù)和三維有限元方法( fem ) ,對(duì)發(fā)動(dòng)機(jī)的關(guān)鍵零件? ?活塞展開(kāi)仿真研究,對(duì)活塞進(jìn)行了包括熱分析在內(nèi)的全過(guò)程的仿真計(jì)算,探索了復(fù)雜工程中邊界條件的處理問(wèn)題,分析計(jì)算了魚(yú)雷發(fā)動(dòng)機(jī)活塞在新型燃料(三組元燃料)工作下的穩(wěn)態(tài)溫度場(chǎng)、應(yīng)力場(chǎng)與變形情況,最后,根據(jù)分析結(jié)果對(duì)其結(jié)構(gòu)提出了改進(jìn)意見(jiàn)。