涡桨发动机火焰筒烧蚀故障分析与预防

摘要

Ablation occurred to a flame tube of turboprop engine. The structure and mechanism of the fault component were analyzed and a fault tree was established. Assembly situation review, size measurement of flame tube and head, fuel nozzle check, physical and chemical analysis were carried out. It was preliminary determined that the fault cause was that the protection air gap of the nozzle head was blocked by carbon deposit. Through fault mechanism analysis and experimental verification, the fault cause was exactly located. Finally, the safety of the flame tube during service was analyzed. It was proposed that the size of the air inlet duct of nozzle nut of every flame tube should be checked.%本研究针对涡桨发动机火焰筒烧蚀故障，对故障部位结构原理进行分析，建立故障树，经装配情况复查、火焰筒尺寸检查、火焰筒头部尺寸和流量检查、燃油喷嘴检查、火焰筒理化分析，初步确定故障原因为喷嘴头部防护气流间隙被积炭堵塞。通过故障机理分析及故障试验验证，准确定位故障原因。最后对外场使用的安全性进行分析，对喷嘴螺母进气槽深尺寸的检查方法进行更改，将该部位的尺寸检查由抽样检查改为100%检查。