Abstract Considering the asymmetry of the low pressure turbine blade (LPT) wake at a low Reynolds number, the influence of asymmetric wakes which are similar to LPT wakes on the boundary layer of downstream blade rows in the near field is studied in the present paper, in order to increase wake flow prediction accuracy of the downstream blade without increasing the difficulty of the experiment or calculation load. Packb high-lift LPT airfoil was studied with CFX software. Following the analysis of the similarities between the wake generated by the cylinder bar and the triangle bar and the LPT blade wake in the near-field, the boundary layer flow characteristics on the suction surface under the different wakes were compared. In this research, it was found that the wakes of biased triangle bar shared more similarities with the LPT blade wake in the near field than the cylinder bar. Furthermore, the biased triangle bar wake was asymmetrical in terms of its centerline, and the separation bubble was suppressed while the calming effect was reduced after the wake-induced transition due to the asymmetry. And the time-averaged momentum thickness decreased by 7 % compared to the cylinder wake.

中文翻译：

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偏斜三角杆和传统圆柱杆对LPT叶片吸入面边界层的尾流效应比较

摘要 考虑低雷诺数下低压涡轮叶片（LPT）尾流的不对称性，研究了类似LPT尾流的非对称尾流对近场下游叶片列边界层的影响，以在不增加实验难度或计算量的情况下，提高下游叶片尾流预测精度。Packb 高升力 LPT 翼型用 CFX 软件进行了研究。通过分析圆柱杆和三角杆产生的尾流与近场LPT叶片尾流的相似性，比较了不同尾流下吸力面边界层流动特性。在这项研究中，结果表明，与圆柱棒相比，偏置三角棒的尾流与近场中的 LPT 叶片尾流具有更多的相似性。此外，偏置三角条尾流在其中心线方面是不对称的，由于不对称，在尾流诱导过渡后，分离气泡受到抑制，而平静效果降低。与汽缸尾流相比，时间平均动量厚度减少了 7%。