航空发动机涡轮后燃气温度检测系统设计及关键技术研究

摘要

航空发动机自动控制系统通过监测发动机涡轮后燃气温度,来实现对发动机涡轮前燃气温度的实时限温控制,从而避免发动机超温故障的出现.针对目前航空发动机涡轮后燃气温度测试精度偏低的工程现状,基于热电偶测温原理,提出了一种高精度涡轮后燃气温度实时检测技术的软、硬件设计方案.设计了一种基于温度校准仪的试验方法对其开展了系列试验,验证了系统的检测精度,并通过数据对比研究了延长导线规格、解算方法等关键因素对航空发动机涡轮后燃气温度检测精度的影响.%To avoid the engine overheating fault, it is the gas temperature detection after turbine of auto control system in aero-engine that carry out the real time control of temperature limit for the gas before the engine turbine. For the current problem of low precision in the gas temperature measurement,a real-time detection technology with high precision was proposed based on the principle of the thermocouple tempera-ture measuring.A novel experiment design based on the method of temperature calibration was carried out, which proved the precision.The effect of key factors such as the extended wire specification and calculating methods on the gas temperature detection accuracy after the engine turbine was investigated through data comparison.