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首页> 外文会议>International Congress on Sound and Vibration >A NEW METHOD OF CONTROLLING FLUTTER OF CAS-CADE BLADES BASED ON A THREE-DIMENSIONAL MODEL
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A NEW METHOD OF CONTROLLING FLUTTER OF CAS-CADE BLADES BASED ON A THREE-DIMENSIONAL MODEL

机译：一种基于三维模型控制CAS-CADE刀片颤动的新方法

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The method of controlling flutter by using a non-rigid wall which has been verified feasible has unique advantages. However, the existence of soft wall section can destroy the continue boundary condition. In this paper, we develop a new method-transfer element method to tackle this problem by dividing the blade row and liner section as independent elements, respectively. For the blade row section, the blade unsteady forces assumed as dipoles source can be calculated by using the lifting surface theory. For the liner section, to avoid getting into the trouble of solving a complicated eigenvalue function, the method of equivalent source surface will play a positive role in tackling such issues by regarding lining walls as series of monopole sources. According to the pressure and axial velocity continuity conditions on the cross-section, we can obtain the algebraic equations expressed as a matrix expression which can be solved to obtain the unknown coefficients. It can be found that the change of admittance will result in significant changes in not only lift coefficient but also moment coefficient which can be cited to determine whether a blade flutters or not.
机译：通过使用已验证可行的非刚性壁控制颤动的方法具有独特的优点。然而，软墙部分的存在可以破坏继续边界条件。在本文中，我们通过分别将刀片行和衬垫部分作为独立元素划分为独立元素来开发一种新的方法传输元素方法来解决这个问题。对于叶片行部分，可以通过使用提升表面理论来计算假定为偶极源的叶片不稳定力。对于衬垫部分，为了避免探讨解决复杂的特征值函数的麻烦，等效源表面的方法将在通过关于一系列单极源的衬里墙壁来解决这些问题时发挥积极作用。根据横截面上的压力和轴向速度连续性条件，我们可以获得表示为矩阵表达的代数方程可以被解决以获得未知系数。可以发现，进入的变化将导致不仅提升系数的显着变化，而且可以引用瞬间系数来确定是否刀片浮翅。

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