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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >A Study of Vortex Structure in the Shear Layer between Main Flow and Swirling Backflow
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A Study of Vortex Structure in the Shear Layer between Main Flow and Swirling Backflow

机译：主流与旋流回旋之间剪切层涡结构的研究

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摘要

The present paper describes the vortex structure and the flow field of model experiments simulating the inlet flow of turbomachines at low flow coefficients. A new experimental apparatus was devised to freely set the axial velocity of the main flow and the axial and tangential components of the swirling backflow. The vortex structure was visualized by small air bubbles. It occurs in the shear layer between the main flow and the backflow. The number and the radial location of vortices are determined mainly by the axial and tangential velocities of the backflow normalized by the axial velocity of the main flow. These characteristics agree with those of the backflow vortex structure of real turbomachines. This shows that the vortex structures are claused by the roll-up of the shear layer between the axial main flow and swirling backflow, not associated with the flow interaction with individual blade of the impeller. It was shown that a two-dimensional linear stability analysis can reasonably predict the relation between the number of vortices and their radial location.
机译：本文描述了模拟实验的涡流结构和流场，该实验模拟了低流量系数时涡轮机的进气流。设计了一种新的实验设备，可以自由设置主流的轴向速度以及旋流回流的轴向和切向分量。小气泡使涡旋结构可视化。它发生在主流和回流之间的剪切层中。涡流的数量和径向位置主要由通过主流的轴向速度归一化的回流的轴向和切向速度确定。这些特性与实际涡轮机的回流涡流结构一致。这表明涡流结构由轴向主流和回旋流之间剪切层的卷起所约束，与与叶轮的各个叶片的流动相互作用无关。结果表明，二维线性稳定性分析可以合理地预测涡旋数量与其径向位置之间的关系。

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