燃气轮喷气发动机地面起动试验研究

THE INVESTIGATION OF JET ENGINE STARTING

关键词:  涡轮喷气发动机  地面试验  起动试验

Key words:  Turbojet engine  Ground test  Starting test

摘要:

喷气发动机的起动是新机研制中首先遇到的问题,要求起动过程迅速可靠,主燃油迅速点燃,在恰当的供油规律下转子安全地达到慢车转速.而改进起动性能的依据就是对该过程的动态参数进行采集和分析.本文介绍了某型发动机起动过程参数的采集方法和数据分析,并为改善叶尖过热做了初步分析.

Abstract:

Starting of jet engine is required to ensure the engine to be rotated up to idle reliably and satisfactorily. The starting performance is modified based on the test to a flight evalution schedule of a sample engine. The measurement and the data acquisition for a small single spool engine are conducted on a sea-level test bench firstly.It is shown that as main fuel is ignited flame with temperature above 1250℃ occurs at blade tips, while the average exhaust gas temperature is 400-500℃. The mechanism and the criteria for overheating of turbine blade and hot hung during starting are presented in this paper .By using heat releasing ratio DTP as the criteria to measure the overheating, the effects of FAR,fuel droplet size, fuel evaporation constant and air density on it are also discussed.