摘要
针对某型航空活塞发动机在运行中多次出现的空中气门卡阻故障,结合该型发动机的结构设计和实际运行环境,对故障发动机气门导套内沉积物的成分进行分析,并基于EGView软件对故障案例的FDR数据进行分析,结果表明:温度剧变导致气门-导套间有效配合间隙减小是导致空中气门卡阻的根本原因;在飞行中,在30%功率附近燃油流量偏小是导致温度剧变的主要原因。据此提出了增加发动机30%功率附近燃油流量的解决方案,给出了推荐的下限阈值为17.0L/h,经实践验证该排故方案有效。
In view of the air valve sticking faults that occured many times in the operation of a certain type of aero piston engine,the component of the sediment in the valve guide sleeve of the faulty engine was analyzed based on the structural design of the engine and the actual operating environment.The FDR data of the fault case was analyzed based on the EGView softw-are.The results show that the reduction of effective fit clearance between valve and guide sleeve due to the temperature upheaval is the fundamental cause of air valve sticking.In flight,the small fuel flow near 30%power is the main cause of temperature upheaval.A solution to increase the fuel flow near 30%power of the engine is proposed,and the recommended threshold is 17.0 L/h.It is proved by practice that the proposed scheme is effective.
作者
龙小辉
孟现召
LONG Xiao-hui;MENG Xian-zhao(Aircraft Repair & Overhaul Plant,Civil Aviation Flight University of China,Guanghan Sichuan 618307,China;Luoyang Branch,Civil Aviation Flight University of China,Luoyang Henan 471000,China)
出处
《航空发动机》
北大核心
2019年第4期9-15,共7页
Aeroengine
基金
中国民用航空飞行学院成果转化与创新基金(CJ2018-04)资助
