航空涡扇发动机起动热悬挂故障诊断

为了完善某型航空涡扇发动机起动性能设计,通过分析发动机的起动控制逻辑和热悬挂控制逻辑,确定了起动热悬挂故障的原因。起动热悬挂分为排气温度 T6上升率过高故障和压气机出口压力 P31上升率过低故障 2种模式,故障原因分别为初始供油量偏多和起动过程 P31波动,针对故障原因制定了解决措施:初始点火供油量设定值下调,提高 P31传感器小压力段的测量精度,并优化 P31斜率异常故障判故逻辑。上述解决措施不仅解决了起动热悬挂问题,更进一步增强了产品设计与生产的兼容性,提高了发动机的起动性能和起动成功率。

Diagnosis of Hot Suspension Faults During Aeroengine Starting Process

To improve the design of aeroengine starting performance, the reason for hot suspension fault in starting process isdetermined by analyzing control logics of starting process and hot suspension. Starting hot suspension can be divided intotwo modes: exhaust temperature high-speed rising fault and compressor outlet pressure low-speed rising fault. The reasonscausing the two hot suspension faults are high initial fuel supply and fluctuation of compressor outlet pressure, respectively.Solutions are formulated for the causes of the faults: lower the initial fuel supply, modify the measurement accuracy of thesmall pressure section of the sensor, and optimize the slope fault diagnosis logic of the compressor outlet pressure. Solutionssolve the problem of starting hot suspension, enhanced the compatibility between product design and production, and im.proved the starting performance and starting success rate of the aeroengine.