稳定负荷对流体机械叶片颤振稳定性的影响

Effect of Steady Loading on Blade Flutter in Fluid Machineries.

将二维平面振荡叶栅的非定常流场分解为定常平均流场和以简谐振荡为运动规律的非定常小扰动流场的叠加，通过求解定常的Ｎ─Ｓ方程和非定常的线化Ｎ—Ｓ方程模拟非定常流场，来研究定常流动负荷对叶片颤振稳定性的影响，考察了在不同的叶型弯角、不同的来流攻角和不同的来流速度情况下的叶片颤振稳定性．结果表明叶型弯角、来流攻角和来流相对速度均对叶片的颤振性能有较大的影响。

Abstract The effect of steady flow loading on the flutter stability as well as that of theblade's turning angle, flow incidence angle, and flow velocity is studied in asimulating way by breaking up the 2-D unsteady flow in an oscillating cascadeinto a steady mean flow and superposed small sinusoidal oscillations,and thenrespectively solving the Navier-Stokes equation for steady flow and the linearizedNavier-Stokes equafion for the unsteady flow field. Results show that the profile's turning angje, the angle of incidence and the relative flow velocity, all affect the blade's flutter behavior considerably.