轴流压缩系统失稳现象的主动控制

为了开展对压缩系统旋转失速和喘振两类失稳现象的主动控制研究,进一步改善压缩系统防喘振控制的效果,选取了轴流压缩系统的四阶失稳模型,将容腔出口节流阀作为主动控制的作动机构,用非线性控制理论中的backstepping方法,设计抑制压缩系统失稳现象的主动控制律,应用于失稳模型,通过仿真,验证了在变转速条件下,旋转失速、喘振以及旋转失速和喘振先后发生时的控制效果.肯定了失稳主动控制比传统的防喘振控制和单纯的喘振主动控制的优越性,并通过仿真,考察了控制律对于系统特性参数和结构参数变化的鲁棒性.结论:研究压缩系统失稳的主动控制,无论在理论和实用都有重要意义.

Active control of axial compressor flow instabilities

In order to develop the theoretical research about active control of flow instabilities that include rotating stall and surge in compression systems and to improve the surge control effect, a four - state model for instabilities in the axial flow compression system is recommend and analyzed by simulation. The throttle located at the exit of plenum is selected for the actuator of active control. An advanced control strategy - backstepping method is introduced for nonlinear control integration. And then, an active controller is designed and applied to the unstable model to validate the control effect for rotating stall, surge, as well as rotating stall and surge that take place successively by means of numerical simulation. Meanwhile, the advantages of the proposed controller over conventional surge avoidance and pure active surge control are discussed and compared. Finally, the robust of the controller to the variety of characteristic parameter and configuration parameter is examined by means of numerical simulation. The conclusion has implications for the theoretical research as well as applications about active control of flow instabilities in compression systems.