摘要
对于燃气弹射过程中传动活塞受高温燃气作用而产生的热传导问题,通过热传导理论分析、Matlab数值计算及有限元仿真的手段,分析了传动活塞瞬态受热情况并对其进行了防护处理。理论分析及数值计算结果表明,传动活塞在轴向区间(0,22mm)内的温度梯度呈线性变化,当达到AL7075-T651熔点748 K时,长度约为6mm。有限元仿真结果表明,传动活塞在承受1000 K高温时,温度梯度基本呈线性变化,其发生熔化的长度约为4.9mm,与理论值基本吻合。针对传动活塞高温受损问题设计了圆片型热防护结构,通过对五种不同材料热防护结构的仿真分析可知,C/C复合材料制作的热防护结构性能最优。通过传动活塞瞬态受热分析,可为某新型燃气弹射装置的工程设计和分析提供一定借鉴,以填补燃气弹射传动活塞受热分析的空白。
In view of the heat conduction problem caused by high temperature gas acting on the transmission piston in the process of gas-ejection,the transient thermal analysis of the transmission piston is carried out by the method of thermal conduction theory analysis,Matlab numerical calculation and finite element simulation,and the protective treatment for the transmission piston is designed.The theoretical analysis and numerical results show that the temperature gradient of the transmission piston varies linearly in the axial region(0,22 mm),and the length reaching the melting point of AL7075-T651 at 748 K is about 6 mm.The finite element simulation results show that the temperature gradient of the transmission piston changes linearly under high temperature at 1000 K,and the transmission piston melting length is about 4.9 mm,which is in good agreement with the theoretical value.In order to solve the problem of high temperature damage of transmission piston,the circular thermal protection structure is designed.The thermal protection structure made of C/C composite material is the best through the simulation of five kinds of thermal protection structures of different materials.The analysis of transient thermal of the transmission piston provides a reference for the engineering design and analysis of a new type of gas-ejection device,and fills up the blank of the thermal analysis of the gas-ejection transmission piston.
作者
赵昌方
任杰
卢炯彪
高俣
Zhao Changfang;Ren Jie;Lu Jiongbiao;Gao Yu(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Hubei Sanjiang Aerospace Jianghe Chemical Technology Co.,Ltd.,Yuanan 444299,China;China North Vehicle Co.,Ltd.,Beijing 100040,China)
出处
《战术导弹技术》
北大核心
2019年第6期26-31,共6页
Tactical Missile Technology
基金
国家自然科学基金(51303081)
江苏省自然科学基金(bk20170837)
关键词
燃气弹射
瞬态受热
传动活塞
热防护处理
热传导
导弹
gas-ejection
transient thermal
transmission piston
thermal protection treatment
heat conduction
missile
