涡扇发动机熄火故障在线检测方法

采用机载可测量的高压转子物理转速、低压转子物理转速和发动机进口总压等参数,建立了基于换算加速率的熄火故障在线检测方法.经全包线发动机工况计算仿真和试验验证,熄火过程的高低压转速加速率幅值为减速和喘振过程的1.5～5.0倍,高压轴断裂过程的高压转子加速率幅值是熄火过程的6.0～10.0倍,低压轴断裂过程的低压转速加速率幅...

On-line detection method of flameout in turbofan engine

The on-board measured parameters including high pressure rotor speed, low pressure rotor speed and engine inlet total pressure were used to establish the flameout on-line detection method based on the corrected change rates of these physical speeds. According to engine states modulations in the whole envelop and engine tests, the amplitude of change rates of high and low pressure rotor speeds in flame out process was 1.5-5.0 times that in deceleration and surge process, the amplitude of change rate of high pressure rotor speed in high pressure shaft fracture process was 6.0-10.0 times that in flameout process, and the amplitude of change rate of low pressure rotor speed in low speed pressure shaft frac-ture process was 2.0-3.5 times that in flameout process. With these properties, the detection method could clearly distinguish flameout process from other transient processes such as deceleration, surge and shaft fracture. Being verified in engine tests, the detection time was 0-0.3s, the detection rate of this method was 100%, and no false or missed detection had been found.