军用小涵道比涡扇发动机最大状态控制计划鲁棒性分析

Robustness Analysis of Maximum State Control Plan for Military Small Bypass Ratio Turbofan Engine

关键词:  部件性能退化  控制计划  鲁棒性  最大状态  涡扇发动机

Key words:  Component performance degradation  Control plan  Robustness  Maximum state  Turbofan engine

摘要:

军用小涵道比涡扇发动机在部件性能退化情况下推力保持稳定可有效保证战斗机的作战性能，合理的控制计划有助于实现这一目标。本文进行推力计算公式推导，从理论上分析对比了在部件性能退化情况下，几种经典最大状态控制计划发动机推力性能的变化。理论分析表明，相较于被控量为高压转子转速和涡轮落压比（或低压转子转速）的最大状态控制计划，控制发动机流量和增压比的最大状态控制计划在发动机退化情况下，能够更好地保持推力。仿真结果表明，在不同部件性能退化情况下，控制发动机流量和增压比的最大状态控制计划推力变化最大幅度仅为-2.04%，而被控量为高压转子转速和涡轮落压比（或低压转子转速）的最大状态控制计划推力变化最大幅度高达6.9%。相较而言，控制发动机流量和增压比的最大状态控制计划可有效保证发动机性能稳定，具有更强的鲁棒性。

Abstract:

The low bypass ratio turbofan engine for military use maintains stable thrust in the case of component performance degradation， which can effectively ensure the combat performance of the fighter. A reasonable control plan can help achieve this goal. To this end， the thrust calculation formula is derived， and the thrust performance changes of several classical maximum state control plans are analyzed and compared theoretically under the condition of component performance degradation. The theoretical analysis shows that the maximum state control plan， which controls the engine flow rate and engine pressure ratio， can maintain the thrust better under the condition of engine degradation compared with the maximum state control plan whose controlled variables are high-pressure rotor speed and turbine drop pressure ratio （or low-pressure rotor speed）. The simulation results show that under the condition of performance degradation of different components， the maximum range of thrust change at the maximum state control plan for controlling engine flow and engine pressure ratio is only -2.04%， while it at the maximum state control plan is as high as 6.9% when the controlled variables are high-pressure rotor speed and turbine drop pressure ratio （or low-pressure rotor speed）. In contrast， the maximum state control plan， which controls the engine flow rate and engine pressure ratio， can effectively ensure the stability of engine performance and has stronger robustness.