涡扇发动机进口畸变条件下的优化控制规律

提出了一种满足涡扇发动机不同进口畸变要求的控制规律.在涡扇发动机低进口畸变条件下通过提高增压比来提高性能,在高进口畸变条件下降低增压比并辅助导叶角调节以提高发动机裕度.根据不同的进口畸变条件下的裕度要求,提出了带边界缓冲区的差分进化算法(DEBZ),在包线内优化获取发动机增压比及导叶角控制规律.结合模型、控制器和控制规律完成涡扇发动机全包线仿真.仿真结果表明:采用该控制规律在畸变指数为2的条件下,涡扇发动机推力性能能够提高8%以上,而在畸变指数为8的条件下,涡扇发动机的可用裕度可以满足稳定要求,同时推力性能能够提高1%以上. 

Optimizated control scheme for turbofan engine under inlet distortion conditions

A control scheme of satisfying different inlet distortions was proposed for turbofan engine. The turbofan-engine performance was improved by increasing the pressure ratio under low inlet distortion conditions, and the pressure ratio was reduced with addition of guide vane adjustment to provide additional stall protection at high inlet distortion. By using the differential evolution algorithm with border buffer zone(DEBZ), the control scheme of the turbofan engine pressure ratio and variable guide vanes in envelope was optimized and obtained according to the requirements of stall margin with different inlet distortions. The simulation over full envelope was accomplished with the model, control algorithm and control scheme. Using the proposed control scheme, the simulation results show that thrust performance of turbofan engine can be improved more than 8% when the distortion index is 2, and the stall margin requirements can be satisfied when the distortion index is 8 with more than 1% thrust performance improvement.