有限长壁面处理对叶片气动弹性稳定性的影响

应用壁面处理控制叶片颤振与其他方法相比有其特殊优势,但由于加入软壁面特别是有限长的壁面处理,给求解方法带来很多困难.本文提出一种新的模型,采用一种新方法--传递单元法,从而有效避免了界面匹配和特征值求解中引起的各种困难问题,并且通过该模型可以探讨研究者们更为关心的有限长壁面处理对叶片颤振特性的影响.数值计算结果表明,有限长壁面处理阻抗值的大小对气动弹性稳定性有显著影响.因此,本文提出的模型为实现应用壁面处理控制叶片颤振,进一步丰富了其理论依据.

Effect of finite-length casing treatment on cascade aero-elastic stability

The application of casing treatment to the control of blade flutter may have advantages particularly compared with the existing methods of suppressing blade flutter.In the present paper,a novel method,which is called transfer element method,has been proposed to establish an aero-elastic model,which considers the effect of finite-length casing treatment on the blade flutter inception. The present model avoids the difficulty of solving eigenvalue due to impedance wall condition effectively.In particular,the numerical results show that the value of impedance of lining wall has a marked effect on the aero-elastic stability.The possibility of using finite-length casing treatment to suppress the blade flutter has been concluded.