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针对某型民用涡扇发动机,将n-dot闭环控制算法应用于涡扇发动机起动过程,设计了涡扇发动机起动过程开环与闭环分段组合的控制计划,仿真表明:涡扇发动机起动过程采用n-dot闭环控制算法在初始阶段会出现参数摆动的情况.为此,基于油气比作控制变量进行消喘的原理,对n-dot闭环控制算法进行了改进,以消除起动初始阶段的参数摆动.试验结果表明:改进后的分段组合的控制计划能够有效抑制参数摆动现象;并且,对于不同大气条件的起动测试,起动过渡态过程高压转子转速的数值差距不大于1.0%,延时不超过0.9s;而对于不同飞行状态的起动测试,起动过渡态过程高压转子转速的数值差距不大于1.0%,延时不超过1.2s,具有良好的稳定性和重复性.
For a certain type of civil turbofan engine, the n-dot closed-loop control algorithm is applied to the starting process of the turbofan engine. The control scheme of the open-loop and closed-loop subsection combination of the turbofan engine starting process is designed. The simulation shows that the turbofan engine starting process n-dot closed-loop control algorithm will appear parameter swing in the initial stage.Therefore, based on the principle of hydrocarbon-oil ratio as control variable to eliminate asthma, n-dot closed-loop control algorithm is improved to eliminate the parameter swing The experimental results show that the control scheme of the improved subsection combination can restrain the parameter swing effectively and the numerical difference of the high speed rotor speed during starting transition state is not more than 1.0% for starting test under different atmospheric conditions, the delay does not exceed 0.9s. However, for the starting test at different flight states, the numerical difference of the high-speed rotor speed in the starting transition state is not more than 1.0% and the delay time is no more than 1.2s, which has good stability and repeatability.