某型航空活塞发动机调贫阈值的实验测定

孟现召; 唐晓波

doi:10.13224/j.cnki.jasp.2020.03.001

某型航空活塞发动机调贫阈值的实验测定

doi: 10.13224/j.cnki.jasp.2020.03.001

基金项目: 中国民用航空飞行学院科学研究基金（CJ2018-04）

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出版历程
- 收稿日期: 2019-10-05
- 刊出日期: 2020-03-28

Experimental determination of leaning threshold at a certain aero piston engine

Luoyang College,Civil Aviation Flight University of China,Luoyang Henan 471000,China

摘要

摘要: 基于某型航空活塞发动机在运行中因过度调贫而导致大量排气门烧蚀的现象,为控制调贫幅度获取便于工程实践操作的安全调贫阈值,通过测量排气门密封面附近气门体的实际运行温度,获取了该型发动机上气门运行温度与排气温度之间的对应关系,解决了以排气温度(EGT) 为参变量间接衡量气门体实际运行温度的工程问题。结果表明:利用该对应关系在确保排气门密封面上保护膜不被破坏的前提下得出该型发动机上安全调贫阈值为排气温度为732℃,经70000飞行小时的实践验证表明此阈值可靠。
- 活塞发动机 /
- 气门烧蚀 /
- 过度调贫 /
- 调贫阈值 /
- 密封面温度 /
- Cr2O3保护膜
Abstract: In order to control the leaning range and obtain the convenient safety leaning threshold for engineering practice based on the case of a large number of exhaust valve ablations caused by excessive leaning in the operation of a certain aero piston engine, the corresponding relationship between valve operating temperature and exhaust gas temperature (EGT) at this engine was obtained by measuring the actual operating temperature of exhaust valve body near the sealing surface, and the engineering problem of indirectly measuring the actual operating temperature of valve body with EGT as parameter was solved. With the corresponding relation and by ensuring that the protective layer on the exhaust valve sealing surface was not damaged, the safety leaning threshold with 732℃ of EGT at this engine was obtained, and the reliability of this threshold was proved by practical test of 70000 flight hours.
- piston engine /
- valve ablation /
- excessive leaning /
- leaning threshold /
- temperature on sealing surface /
- Cr2O3 protective layer

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