掠叶片进口流场中周向不均匀性的影响

Effect of Circumferential Non-uniformity on the Inlet Flow Fields of a Swept Blade

为模化并分析迎角改变时掠叶栅流场中周向不均匀性的影响,将1种应力输运模型整合到通流模型中,并应用于某掠叶栅的计算。通过给定掠叶栅不同来流迎角开展3D数值模拟和通流计算,结果表明:主要由无黏叶片力所诱发的周向不均匀性会重新组织叶片通道的进口流场,改变进口气流角,从而引发掠叶栅进口径向平衡的重新分布,随着迎角的提高,这种周向不均匀性将加强,其对进口流动的影响也会进一步增大。加入该应力输运模型后,通流模型能够很好地预测周向脉动源项,在前缘前其计算值与3D计算结果的偏差在20%以内,对叶片通道进口气流角改变量的预测精度提高了25%以上,对进口流动径向平衡的描述精度提高了60%以上。

In order to model and analyze the effect of the circumferential non-uniformity on the flow field of a swept cascade,a kind of stress transport model was integrated into the throughflow model.3D numerical simulation and throughflow calculation of a swept cascade were carried out at different inlet angles of the given cascade.The results show that the non-uniformity induced by the inviscid blade force will reorganize the inlet flow field of the blade passage and change the inlet flow angle,thus causing the redistribution of the radial balance of the inlet.With the increase of incidence angle,the circumferential non-uniformity will be strengthened,and its influence on the inlet flow will also increase.After adding the stress transport model,the throughflow model could predict the circumferential pulse source well.The descrepancy between the throughflow value and the 3D calculation results is within 20%before the leading edge.The prediction accuracy of the inlet flow angle change of the blade passage raised by 25%,and the description accuracy of the radial balance of the inlet flow is raised by more than 60%.