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叶片排干涉对叶片颤振和强迫振动具有显著影响,采用多叶片排三维和二维半激盘模型对此进行了研究。分析表明,叶片排干涉效应与非定常扰动的传播特征及叶片相对轴向位置有关。对稳定性问题,能量法分析结果说明叶片排干涉使叶片更易失稳,但适当调整叶片相对轴向位置有可能提高叶片气动弹性稳定性。在由相邻叶片排尾迹诱导的强迫响应问题中,主要由阵风响应流场决定叶片的气动弹性行为,在亚共振模态下,占主导作用的势流阵风响应随叶片排轴向间距减小而迅速增强,故在叶轮机设计中,叶片排轴向间距不应低于一定的安全值,以免诱导过强的阵风载荷和叶片强迫响应
Vane row interference has a significant effect on flutter and forced vibration of vanes, and this is studied by using three-dimensional and two-dimensional semi-disk model of multi-blade row. The analysis shows that the interference effect of blade row is related to the propagation characteristics of unsteady disturbance and the relative axial position of blade. For the stability problem, the energy analysis shows that the blade interference is more stable, but adjusting the relative axial position of the blade may improve the aerodynamic stability of the blade. In the forced response induced by the row of adjacent blades, the aerodynamic elastic behavior of the blade is mainly determined by the gust response flow field. In the sub-resonant mode, the dominant gust response is decreased with the blade axial distance Therefore, in the design of the impeller, the axial distance between the blades should not be lower than a certain safety value so as to avoid excessive gust load and blade forced response