某型航空活塞发动机排气门烧蚀机理

张洪涛; 孟现召; 冯岩鹏

doi:10.13224/j.cnki.jasp.2015.09.022

某型航空活塞发动机排气门烧蚀机理

doi: 10.13224/j.cnki.jasp.2015.09.022

1. 中国民用航空飞行学院洛阳分院, 河南洛阳 471000;
2. 中国民航科学技术研究院航空安全技术实验室, 北京 100028

基金项目:

中国民用航空飞行学院科学研究基金重点项目(ZJ2014-05)

详细信息

作者简介:
张洪涛(1968-),男,河南郾城人,工程师,硕士,主要研究方向为航空维修管理和航材管理.

中图分类号: V234⁺1
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- 文章访问数: 1206
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出版历程
- 收稿日期: 2015-01-20
- 刊出日期: 2015-09-28

Principle of exhaust valve ablation at an aero piston engine

1. Luoyang College, Civil Aviation Flight University of China, Luoyang Henan 471000, China;
2. Laboratory of Aviation Safety Technology, China Academy of Civil Aviation Science and Technology, Beijing 100028, China

摘要

摘要: 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.
- 活塞发动机 /
- 排气门烧蚀 /
- 高铅燃油 /
- 铅沉积 /
- 金相分析
Abstract: Serious exhaust valve ablation occurred at an aero piston engine during operating process due to the domestic high lead content fuel. Through micro metallographic analysis about the new, served and ablated exhaust valves from these engines, and based on the engine structural design and actual operating environment, a conclusion was drawn. Too high operating temperature making damage to the anti-corrosion protection layer on the exhaust valve's sealing area is the primary cause of the exhaust valve ablation, and the lead from the high lead content fuel deposited on the sealing area making the exhaust valves in poor-cooling condition is the predominant cause of hotter exhaust valves. The corresponding solution could improve the exhaust valve's cooling condition and decrease their operating temperature by running these engines with low lead content fuel to reduce the lead deposition. The practice shows that the anti-corrosion layer has been well protected and the fault of exhaust valve ablation is fixed in these engines.
- piston engine /
- exhaust valve ablation /
- high lead content fuel /
- lead deposit /
- metallographic analysis

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