高压补燃发动机э形弹性金属密封机理研究

э形弹性金属密封是一种适用于大通径、低温、高压密封环境的金属密封结构,已成功应用于高压补燃液氧/煤油发动机液氧管路密封。针对100吨级高压补燃发动机中的э形弹性金属密封,建立了其非线性有限元弹塑性分析模型,基于ABAQUS 6.10进行了仿真计算,得到了4个密封面的接触面积和接触应力随预紧载荷的变化规律,确定了各密封面形成的先后顺序。对于密封机理的研究结果表明,э形环刚度过大是造成э形密封装配困难的根本原因。

Research on sealing mechanisms of Э-shaped elastic metal seal in high-pressure staged combustion rocket engine

э -shaped elastic metal seal is suitable for large diameter sealing joint, high pressure and low temperature environment. It has been successfully used in the LOX pipeline system of high pressure staged combustion LOX/kerosene rocket engine. The nonlinear analysis model of э -shaped elastic metal seal in the 100 t staged high-pressure combustion rocket engine was established. By conducting the nonlinear finite element analysis with ABAQUS 6.10, the variation regularity of contact area and average contact stress on the four sealing surfaces with pre-tighten load was captured, and the forming sequence of the sealing surfaces was confirmed. The research result of sealing mechanism indicates that the excessive axial stiffness of э -shaped ring is the ultimate reason which causes the assembly difficulty.