Assessment of Les Performance in Simulating Complex 3D Flows in Turbo-Machines

Wen-Tao Su; Feng-Chen Li; Xiao-Bin Li; Xian-Zhu Wei; Yue Zhao

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Assessment of Les Performance in Simulating Complex 3D Flows in Turbo-Machines

机译：Les性能评估涡轮机中复杂3D流的性能

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AbstractThis paper aims at making an assessment of the performance of the large eddy simulation (LES) method in simulating the complex vortical flow in a Francis hydraulic turbine. Firstly the principle of the LES method is presented. Then, three-dimensional turbulent flow of the Francis turbine under selected condition is simulated using the LES method with the Smagorinsky-Lilly model. In the hydraulic turbine, pressure distribution, vortex structures and other flow information are captured, from which the low pressure area beside the suction side of the blade and vortex structure in the draft tube can be seen clearly. Compared with the results from both experiments and simulations by the Reynolds average Navier-Stokes (RANS) method with the k-E turbulent model, the LES results are proven to be more accurate in predicting the overall performance and interior flow characteristics of Francis hydraulic turbine. This work attempts to apply the LES method to simulate the flow field in the flow passages of the...

机译：摘要本文旨在评估大型涡模拟（LES）方法在混流式水轮机中模拟复杂涡流的性能。首先介绍了LES方法的原理。然后，使用LES方法和Smagorinsky-Lilly模型，模拟了在选定条件下的弗朗西斯水轮机的三维湍流。在水轮机中，捕获压力分布，涡流结构和其他流量信息，从中可以清楚地看到叶片吸入侧旁的低压区域和引流管中的涡流结构。与雷诺平均Navier-Stokes（RANS）方法与k-E湍流模型的实验和仿真结果相比，事实证明，LES结果可以更准确地预测弗朗西斯水轮机的整体性能和内部流动特性。这项工作试图应用LES方法来模拟管道的流道中的流场。

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《Engineering Applications of Computational Fluid Mechanics》 |2012年第3期|共10页
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Wen-Tao Su; Feng-Chen Li; Xiao-Bin Li; Xian-Zhu Wei; Yue Zhao;
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机译：评估罐式燃烧器中旋流的RANS模型的性能评估
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机译：模拟复杂湍流多相流的流体方法的3D时刻
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机译：模拟复杂几何形状中3D粘弹性流的耦合有限体积沉浸边界方法
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Assessment of Les Performance in Simulating Complex 3D Flows in Turbo-Machines

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