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首页> 外文期刊>Strength of Materials >EXPERIMENTAL-NUMERICAL INVESTIGATION OF THE DYNAMIC STABILITY OF FLEXURAL-TORSIONAL VIBRATIONS OF COMPRESSOR BLADES UNDER CONDITIONS OF ATTACHED AND SEPARATED FLOW PART 3. MUTUAL AERODYNAMIC COUPLINGS
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EXPERIMENTAL-NUMERICAL INVESTIGATION OF THE DYNAMIC STABILITY OF FLEXURAL-TORSIONAL VIBRATIONS OF COMPRESSOR BLADES UNDER CONDITIONS OF ATTACHED AND SEPARATED FLOW PART 3. MUTUAL AERODYNAMIC COUPLINGS

机译：附着和分离流动条件下压气机叶片弯曲-扭转振动动力稳定性的实验和数值研究。第3部分。相互气动耦合

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摘要

In our earlier work [1], results of determining cross aerodynamic characteristics (CAC) and their effect on the flutter stability of compressor and fan blades were reported. In the case of flexural-torsional vibrations of blades, these characteristics are determined by aerodynamic interaction between translational and angular displacements of their sections. However, during the operation of axial flow turbomachines, mutual aerodynamic couplings also arise from interaction in the stream between the components of displacements of neighboring ring blades. As is pointed out in [2], they may be responsible for the appearance of cascade flutter of blades under the conditions of both attached and separated flow over them. Survey of scientific and technical literature shows that the character of the variation of this type of couplings as a function of flow conditions and blade vibration parameters and their effect on the aerodynamic stability of blade rings have been practically not studied. Therefore, the aim of the present study is to establish the laws governing the variation of mutual aerodynamic couplings as a function of attack angle and reduced vibration frequency for different geometric characteristics (pitch-chord ratio and deflection angle) of blade ring and their effect on its aerodynamic stability.
机译：在我们的早期工作中[1]，报告了确定交叉空气动力特性（CAC）及其对压缩机和风扇叶片颤振稳定性的影响的结果。在叶片的弯曲扭转振动的情况下，这些特性由其截面的平移和角位移之间的气动相互作用确定。然而，在轴流式涡轮机的操作期间，由于相邻环形叶片的位移的分量之间的流中的相互作用，也产生了相互的气动耦合。正如在[2]中指出的那样，在叶片上附着和分开流动的情况下，它们可能是导致叶片级联颤动的原因。科学和技术文献的调查显示，这种类型的联轴器随流量条件和叶片振动参数而变化的特性及其对叶片环空气动力学稳定性的影响尚未得到实际研究。因此，本研究的目的是建立根据叶片环的不同几何特性（螺距-弦比和偏转角）来控制相互气动耦合的变化规律，这些规律是迎角和振动频率降低的函数。它的空气动力学稳定性。

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