Numerical simulation was carried out to study the influences of blade-bowing designs based on a highly loaded cascade with large turning angle, while the compound bowing design showed much lower endwall loss than the conventional design in this study. Generally, it showed that the increased turning angle would strengthen the adverse pressure gradient on the suction surface, so the side effect of negative blade bowing angle would be enhanced because of the reduced flow filed stability near suction–endwall corner. However, the positive corner bowing angle that applied in the compound bowing design would enhance the flow field stability near the suction–endwall corner by adjusting spanwise pressure gradient and velocity triangle, so the side effect of negative blade bowing angle would be suppressed and lead to weaker secondary flow. In detail, the blade bowing angle (as well as the corner bowing angle in the conventional bowed cascades) was varied from −5° to −30° in this study, while the reductions of the loss coefficient in the compound bowed cascades were about 0.662.16 times higher (the absolute differences were about 0.0067 0.0097) than the corresponding conventional bowed cascades. Moreover, the Reynolds number and Mach number at the outlet plane were kept at 2.4 × 105 and 0.6, respectively, during the bowing design to ensure the comparability.

中文翻译：

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大转向角高负载线性级联中的复合弓形设计

进行了数值模拟以研究基于大转向角的高负载叶栅的叶片弯曲设计的影响，而复合弯曲设计在本研究中显示出比传统设计低得多的端壁损失。总的来说，表明增大的转向角会加强吸力面上的逆压力梯度，因此，由于吸力端壁角附近的流场稳定性降低，叶片负弯曲角的副作用会增强。然而，复合弓形设计中应用的正角弓角会通过调整展向压力梯度和速度三角形来增强吸力端壁角附近流场的稳定性，从而抑制叶片负弓角的副作用并导致弱二次流。详细，在这项研究中，叶片弯曲角（以及传统弓形叶栅中的角弓形角）从-5°到-30°变化，而复合弓形叶栅的损失系数降低了约0.662.16倍比相应的传统弓形级联更高（绝对差异约为 0.0067 0.0097）。此外，在弓形设计过程中，出口平面的雷诺数和马赫数分别保持在 2.4×105 和 0.6，以确保可比性。