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通过求解雷诺平均Navier-Stokes(N-S)方程并采用影响系数法,对三个基本正交模态的三维振荡跨声风扇叶片绕流问题进行了研究,基于刚体运动假设和模态叠加法,得到了可用于叶轮机械设计阶段颤振稳定性评估的稳定性参数图.结果表明,跨声风扇内部,激波对非定常气动力的分布具有主导作用;在一定情况下振型对颤振稳定性有重要影响,应将其作为颤振稳定性设计的重要参数之一;跨声风扇和亚声低压涡轮的稳定性参数图对比分析表明,两者稳定性参数分布形式具有相似性.
By solving the Reynolds-averaged Navier-Stokes (NS) equation and using the influence coefficient method, the three basic orthogonal modes of three-dimensional oscillating transonic fan blade flow around the flow were studied. Based on the rigid body motion assumption and modal superposition method, The stability parameter map which can be used to evaluate the flutter stability of the impeller at the stage of mechanical design is shown.The results show that the shock wave has a dominant effect on the distribution of unsteady aerodynamics in the transonic fan and under certain conditions, It should be regarded as one of the important parameters for the design of flutter stability. Comparing the stability parameter diagrams of transonic fan and subsonic low-pressure turbine, it shows that the distribution of the stability parameters is similar.