摘要
针对转子加速度(N-dot)加速控制计划存在全包线范围内适用性不足的问题,提出了一种基于相似换算N-dot的全包线加速控制方法。推导并验证了在等风扇进口总温线上涡扇发动机风扇转速、压气机转速、涡轮前温度等参数稳态相似换算误差小;研究了N-dot可以直接反映剩余功率的大小,保证动态过程相似换算精度高;选择覆盖发动机全工作包线的有限个等温线工作点,构建了不同总温下换算的N-dot加速控制计划;通过相邻等温线线性插值将加速控制计划拓展至非等温线上工作点,实现N-dot加速控制方法全包线内适用。仿真结果表明:相比于传统开环油气比加速控制计划,在同一等温线不同工作点的加速过程,所提方法的加速时间分别缩短了5.31%和10.32%,在非等温线工作点的加速过程,加速时间缩短了57.74%,且全工作包线点的加速时间在2.3~12.3 s内,加速过程均不会出现参数超限问题。所提方法在发动机全包线内的加速控制均能满足快速性和安全性的需求。
To solve the problem that the rotor acceleration(N-dot)acceleration control schedule has insufficient applicability in the full envelope range,a full envelope acceleration control method based on similarity conversion N-dot was proposed.It was proved and verified that the steady-state similar conversion error of fan speed,compressor speed and turbine front temperature of the turbofan engine was small on total temperature line of fan inlet.Then,it was analyzed that N-dot can directly reflect the size of residual power to ensure high precision of dynamic process similarity conversion.A finite number of isotherm operating points covering the full operating envelope of the engine were selected,and the converted N-dot acceleration control schedule under different total temperature was constructed.By expanding the accelerated control schedule to work points on non-isothermal lines by linear interpolation of neighboring isotherms,the application of N-dot acceleration control method in full envelope was realized.The simulation results showed that compared with the traditional method on open-loop fuel-to-air ratio acceleration control schedule,the acceleration time of the proposed method was shortened by 5.31%and 10.32%at different operating points of the same isotherm,and the acceleration time of the non-isotherm operating point was shortened by 57.74%.The acceleration time of the full operating envelope was within 2.3—12.3 s and each parameter did not exceed the limit.The proposed method can satisfy the control requirements of rapidity and safety in the full envelope range of the engine.
作者
王心怡
郑前钢
张海波
WANG Xinyi;ZHENG Qiangang;ZHANG Haibo(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空动力学报》
北大核心
2025年第9期482-493,共12页
Journal of Aerospace Power
关键词
N-dot加速控制计划
相似换算
涡扇发动机
全包线
等温线
N-dot acceleration control schedule
similarity conversion
turbofan engine
full envelope
isotherm
