Research on the Failure of Peak Pressure Time Difference of the Starter Used in A Liquid Rocket Engine
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摘要:针对某液体火箭发动机用起动器峰值压力时间超差故障，进行了原因分析，提出了改进措施并对其有效性进行了试验验证。结果表明：造成起动器峰值压力时间超差故障的原因为起动器内膜片与端盖间的焊接强度不足，在高温燃气冲击下膜片过早脱落、烧蚀，从而导致压力提前泄放。提出将1圈焊接改进为2圈焊接、将点焊改进为连续焊接，焊接后增加气密性及承压性能检测，以及加强削弱槽深度检测等改进措施。验证试验表明上述改进措施可有效避免起动器出现峰值压力时间超差故障。
Abstract:Aimed at the failure of peak pressure time difference of the starter used in a liquid rocket engine, the cause analysis was carried out, the improvement measures were proposed and their effectiveness was tested and verified. The results show that the reason for the failure of peak pressure time difference of the starter is that the welding strength between the diaphragm and the end cover of the starter is insufficient. Under the impact of the high temperature gas, the diaphragm falls off and ablates prematurely, leading to premature release of the pressure. The improvement measures were put forward, which include improving the welding process from 1 circle to 2 circles, improving spot welding to continuous welding, adding air tightness and pressure-bearing performance testing after welding, and strengthening the detection of weakening slot depth. The verification test results indiate the above improvement measures are effective to avoid the appearance of peak pressure time difference of the starter.
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