摘要
涡扇发动机起动控制方法直接影响发动机的起动性能。为在发动机整个起动过程中持续获得高、低压转子转轴上的最大剩余功率,提出了1种涡轮前总温Tt4闭环控制规律用于设计涡扇发动机起动控制的方法。对于起动过程中可能发生的风扇、低压压气机、高压压气机喘振和失速问题,在设计的Tt4闭环回路前加入喘振裕度限制保护控制,并考虑到在起动过程的第1阶段中在起动机带转到发动机点火前Tt4回路不起作用的特点,对Tt4回路设计了积分冻结逻辑。仿真结果表明:在满足给定喘振裕度和涡轮前总温不超温的条件下,涡轮前总温Tt4闭环控制方法能够以持续的最大剩余功率使发动机从静止状态起动到慢车功率状态。
Starting control strategy effects turbofan engine performance directly. A methodology of designing start control strategies using closed-loop control law for the total temperature after the primary combustion chamber（Tt4） was proposed in order to persistently obtain the maximum surplus power of high-low pressure twin-spool during a whole starting process for a turbofan engine. Several limit controllers for surge margin are added to the reference command of the Tt4 closed loop, taking into account prevention against surge or stall for fan,low-pressure compressor and high-pressure compressor. Freezing the integral of the PI controller before the ignition of an engine is introduced to anti-windup. The simulation result illustrates that turbofan engine can successfully start from engine off to idle power with a persistent maximum surplus power and the protection of several limit controllers,which can guarantee adequate surge margin of compression components and Tt4 to not exceed the maximum value.
出处
《航空发动机》
2016年第2期34-37,共4页
Aeroengine
