涡扇发动机换装大功率起动机起动性能分析

Starting performance of a turbofan engine changing high-power starter

为解决涡扇发动机起动问题,采用转速上升率闭环控制的地面起动供油规律,基于地面常规试车台,设计并开展了发动机采用原状态起动机和大功率起动机的起动性能对比试验。结果表明,冷运转时,大功率起动机最高转速较原状态起动机的提高14%;起动时,采用大功率起动机发动机转速上升率提高,发动机冷态起动和热态起动时间分别缩短5.0%和2.7%,发动机转速闭环控制段起动供油量降低20%,起动过程中排气温度下降约10%。研究成果可用于指导航空发动机起动设计工作。

In order to solve the problem of turbofan engine starting,the fuel supply control law of ground start for turbofan engine based on speed rising ratio was used,and a performance contrast starting test has been designed and carried out on the conventional ground test bench.The experimental results show that the highest speed of engine using high-power starter is 14%higher than that of the original state starter in cold operation,for engine with the high-power starter,engine speed rising ratio increases in starting,and engine start time is shortened by 5.0%in cold state and 2.7%in hot state,starting fuel supply drops 20%for speed closed-loop control section of engine,the exhaust gas temperature drops by 10%during the start⁃ing process.Test results can be used to guide the aero-engine starting design.