论文部分内容阅读
发动机地面起动时高压涡轮转子卡滞,通过对该发动机卡滞物及正面环喷管断口的失效分析认为,卡滞原因是由于正面环喷管平面与正面环的球面组合时有不同程度的间隙,在间隙大的部位采用搭桥焊接,焊点细腰部位产生横向收缩裂纹,在校正喷管角度时应力过大,裂纹扩展直至断裂,在工作过程中当3个焊点全部断裂时,正面环喷管脱落并卡滞在高压涡轮工作叶片之间,导致转子卡滞。通过改进焊接工艺,取消校正工艺,加强焊后检查,能有效预防正面环喷管脱落而导致的高压转子卡滞故障。
When the engine ground starts, the high-pressure turbine rotor is stuck. According to the failure analysis of this engine stuck block and the front ring nozzle fracture, the reason for the jam is that there are different degrees of clearance when the front ring nozzle plane is combined with the spherical surface of the front ring , The gap in the large parts of the use of bypass welding, weld spot produces a narrow waist horizontal shrinkage cracks in the nozzle angle correction stress is too large, crack growth until fracture, in the course of the work when all three solder joints fracture, the front ring Nozzle landed and stuck in the high-pressure turbine blades, causing the rotor stuck. By improving the welding process, cancel the calibration process, strengthen post-weld inspection, can effectively prevent the front ring nozzle off caused by the high-pressure rotor stagnation fault.