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为了分析推力室内壁失效机理及准确预估推力室内壁寿命,对推力室进行流-热-固耦合计算.流-热耦合为热-固耦合提供准确的热和机械载荷,热-固耦合模型对推力室内壁在循环加载下的变形进行非线性平面应变有限元分析.通过计算,得到了推力室内壁在单循环各阶段的应力-应变分布和循环加载下的变形过程,并进行了寿命预估.结果表明:采用的流-固耦合策略能准确地实现流-热耦合模块向热-固耦合模块的载荷传递,能为结构分析提供准确的边界条件.在预冷、后冷和松弛阶段,内壁承受拉应力;在工作阶段,内壁承受压应力.随着循环次数的增加,内壁残余应力和应变不断增大,内壁向燃烧室内鼓起和不断变薄,冷却通道中心最先失效.所采用的分析模型能够模拟内壁在循环热和机械载荷下的变形过程,用于预估推力室内壁的循环寿命.
In order to analyze the failure mechanism of the thrust chamber and estimate the life of the thrust chamber accurately, the fluid-thermal-mechanical coupling is calculated for the thrust chamber. The fluid-thermal coupling provides accurate thermal and mechanical loads for the thermo-solid coupling. The thermo-mechanical coupling model The nonlinear plane strain finite element analysis of the deformation of the thrust chamber under cyclic loading was carried out.The stress-strain distribution and the deformation process under the cyclic loading of the inner wall of the thrust chamber were obtained by calculation, The results show that the flow-solid coupling strategy can accurately achieve the load transfer from the flow-thermal coupling module to the thermo-mechanical coupling module and provide accurate boundary conditions for the structural analysis.In the precooling, post-cooling and relaxation phases , The inner wall to withstand tensile stress; in the working stage, the inner wall to withstand compressive stress.With the increase in the number of cycles, the inner wall residual stress and strain increases, the inner wall to the combustion chamber bulging and continuous thinning, cooling channel center first failure. The analysis model adopted can simulate the deformation process of the inner wall under cyclic heat and mechanical load and is used to estimate the cycle life of the thrust chamber.