论文部分内容阅读
基于有限元热结构耦合计算结果分析了液体火箭发动机再生冷却槽的失效形式,并分别采用Porowski模型及其蠕变修正模型对冷却槽进行寿命预估.结果表明冷却槽寿命主要取决于塑性拉伸不稳定失效;蠕变对寿命有一定影响,是寿命预估不可或缺的一部分;减小外壳与内壁的温差幅值、增大每个冷却槽的肋宽比或增加冷却槽数目可以延长寿命.该寿命预估方法可用于指导可重复使用液体火箭发动机再生冷却槽设计.
The failure modes of liquid rocket motor regeneration cooling slots were analyzed based on the coupled thermal FEM calculation results, and the life prediction of the cooling channels was carried out by using Porowski model and its creep correction model respectively. The results show that the life of the cooling tank mainly depends on the plastic stretching Unstable failure; creep has a certain impact on the life expectancy is an integral part of life expectancy; reduce the temperature difference between the shell and the wall amplitude, increase the ratio of the width of each cooling groove or increase the number of cooling slots can extend the life The life prediction method can be used to guide the reusable liquid rocket engine regeneration cooling tank design.