防热层参数对金属隔膜翻转性能的影响

Effect of heat shield parameters on inversion property of metal diaphragm

当金属隔膜贮箱的增压气体为高温燃气时,一般在金属隔膜靠近气腔一侧表面喷涂防热层,对内部的液体推进剂起到隔热作用。涂层的存在相应地增加了隔膜的厚度和刚度,对隔膜翻转会造成一定的影响,以往的研究都忽略了该因素。使用MSC.Marc软件采用大变形有限元法对带防热层金属隔膜的翻转过程进行仿真分析,研究了防热层的厚度、弹性模量等参数对贮箱隔膜翻转过程的影响,得到了防热层参数与翻转的临界载荷的关系。

A thermal insulation layer is usually sprayed at the outer surface of the metal diaphragm in the side near the air cavity if the pressurized gas in the metal diaphragm tank is high-temperature gas. It can play a thermal insulation role to protect the internal liquid propellant in the metal diaphragm propellant tank to be impacted by the high-temperature pressurization gas. Meanwhile, the total thickness and stiffness of the diaphragm are increased because of the existing of the coating, which may cause an influence on the inversion property of the diaphragm. However, this problem was neglected in ihe past. In this paper, the deforming process of metal diaphragm with heat shield is simulated with FEA and MSC. Marc software. The influence of thickness and elastic modulus of heat shield on inversion process of the metal diaphragm was studied, and the relation between main parameters of heat shield and critical load of inversion was obtained.