燃气发生器固定连接结构可靠性改进设计

为满足某火箭发动机燃气发生器固定连接结构长期贮存和长时间高温环境下可靠工作的要求,在保证原固定连接结构形式不变的前提条件下提出了改进设计方案。新的方案采用不锈耐酸钢和高温合金钢替换原普通碳钢,同时采用了新的焊接工艺方法。为了验证新卡箍连接强度和动态特性,进行了模态分析和动应力/动应变理论计算、强度破坏和振动试验。最后通过地面热试车和飞行试验对改进设计方案进行了验证,结果表明新的卡箍提高了结构连接可靠性,完全满足发动机使用要求。

Reliability improvement of fixed connection structure of gas generator

To meet the long-term storage and working reliably requirements of liquid rocket engine gas generator fixed connection structure under high temperature environment for a long time, an improved design scheme under the prerequisite condition that the original fixed connection structure is not changed is presented in this paper. The acid-resistant stainless steel and high temperature alloys are used to replace the original plain carbon steel materials, and the new welding procedure is adopted in the new scheme. In order to verify the intensity and dynamic characteristic of the new clamps, the modal analysis, dynamic stress-strain theoretical calculation, strength damage experiment and vibration test were also performed. The new design scheme was verified in the ground hot commissioning and flight test. The results indicate that the new clamp has improved the reliability of the connection structure and satisfied the new use requirements of liquid rocket engine completely.