高空长航时无人机发动机空中停车故障分析  

Analysis on Engine Air Parking Failure of the UAV During Long Endurance at High Altitude

作　　者：郭政波 杨雄[1] 姚尚宏[1] GUO Zheng-bo;YANG Xiong;YAO Shang-hong(Engine Department of Chinese Flight Test Establishment,Xi′an Shaanxi 710089,China)

机构地区：[1]中国飞行试验研究院发动机所,陕西西安710089

出　　处：《机械研究与应用》2020年第2期44-46,51,共4页Mechanical Research & Application

摘　　要：针对无人机用发动机空中停车故障,基于试飞故障数据,深入分析了停车前发动机油气比和余气系数的变化,研究了发动机燃烧稳定性,探寻了故障机理,确定了其故障原因。研究表明,空中停车的原因为发动机在较低转速状态下,快推油门至高位加大了供油量,副油路压力急增,油气比过大,燃烧室油气不匹配,导致发动机富油熄火停车。结合实际试飞提出解决措施,有效的解决了该发动机空中停车的故障,也为系统优化提供了参考。while the engine combustion stability is particularly important.The engine of a high altitude long endurance UAV encountered a stop when it was cruising at low speed and high altitude.Based on the test flight data,the changes of oil/gas ratio and residual gas coefficient of the UAV engine before stopping are analyzed in this paper;the engine combustion stability is studied,the fault mechanism is explored and the fault causes are finally determined.The research shows that the reason for the air stopping is that under the condition of low speed,the oil supply is increased by pushing the throttle to a high position,the pressure on the auxiliary oil line is increased rapidly,the oil/gas ratio is too large,oil and gas in the combustion chamber mismatches,which would lead to the engine oil rich shut down and stop.Combining with the actual test flight,the solution measures are then put forward,which can effectively solve the fault of engine stopping in the air,and also provide a reference for the system optimization.

关 键 词：无人机发动机 燃烧稳定性 富油熄火 油气比 余气系数 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]