论文部分内容阅读
针对某型航空活塞发动机在运行中因使用国产高铅燃油而时常发生较严重的排气门烧蚀故障的问题,通过对该型发动机上全新、使用过以及已烧蚀排气门的微观金相分析,结合该型发动机的结构设计和实际运行环境分析这种排气门烧蚀故障的发生机理,认为排气门运行温度过高导致排气门密封面上的抗腐蚀保护层被破坏掉是导致排气门烧蚀的根本原因,而高铅燃油中的铅沉积在排气门密封面上导致排气门散热不良是排气门过热的主要原因.据此提出改用低铅燃油减少铅沉积以改善排气门散热条件、降低排气门运行温度的解决方案,经实际运行测试证明排气门密封面上的抗腐蚀保护层得到了有效保护,解决了该型发动机的排气门烧蚀故障.
In view of the problem that a certain type of aero-piston engine often causes serious exhaust valve ablation failure due to the use of domestic high-lead fuel during operation, the micro-gold of the new, used and ablated exhaust valve of the engine is used. Phase analysis, combined with the structural design of the engine and the actual operating environment analysis of the exhaust valve ablation failure mechanism that the exhaust valve operating temperature is too high cause the exhaust valve sealing surface corrosion protection layer is destroyed Is the root cause of exhaust valve ablation, while the lead in high lead fuel deposited on the exhaust valve sealing surface resulting in poor exhaust heat exhaust valve is the main reason for overheating, accordingly proposed to reduce the use of low-lead fuel to reduce Lead deposition to improve exhaust conditions, exhaust valve to reduce the operating temperature of the solution, the actual operation of the test to prove that the exhaust valve sealing surface of the anti-corrosion protection layer has been effectively protected to solve this type of engine exhaust valve Ablation failure.