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首页> 外文期刊>Applied Mathematical Modelling >Large eddy simulation of the tip-leakage cavitating flow with an insight on how cavitation influences vorticity and turbulence
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Large eddy simulation of the tip-leakage cavitating flow with an insight on how cavitation influences vorticity and turbulence

机译：尖端泄漏空化流的大型涡流模拟，深入了解空化如何影响涡度和湍流

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摘要

Cavitation within a tip leakage flow remains a challenging issue in a variety of axial hydraulic machines. It is still not possible nowadays to predict cavitation occurrence in such a flow with acceptable accuracy. In the present study, we have carried out numerical simulations of a tip leakage cavitating flow, generated by a straight NACA0009 hydrofoil. We have used the LES method combined with the Schnerr-Sauer cavitation model. The numerical results agree well with experimental data. The evolution of the tip leakage cavitating flow, involving tip-leakage vortex (TLV), tip-separation vortex (TSV) and induced vortex (IV), is analyzed from Eulerian and Lagrangian viewpoints. The results show that the spatial evolution of the tip leakage cavitating flow can be divided into three stages: Stage I, Independent development of the TLV and TSV: Stage II, Fusion of the TLV and TSV; and Stage III, Development of the IV and dissipation of the TLV. The Lagrangian coherent structures (LCSs) obtained from the numerical results indicate that the TLV cavitation significantly influence the local flow patterns. The vorticity transport equation was then used to further analyze the influence of the cavitation on the vortices. The results demonstrate that the stretching term dominates the TLV evolution and the dilatation term is responsible for the vorticity reduction inside the TLV cavity. The results also show how the cavitation influences the local turbulence and that the transport term in the turbulent kinetic energy equation influences the turbulence distribution near the TLV cavity. (C) 2019 Elsevier Inc. All rights reserved.
机译：在各种轴向液压机中，尖端泄漏流内的气穴现象仍然是一个具有挑战性的问题。如今仍无法以可接受的精度预测这种流动中的气蚀现象。在本研究中，我们对由直管NACA0009水翼产生的尖端泄漏空化流进行了数值模拟。我们将LES方法与Schnerr-Sauer空化模型结合使用。数值结果与实验数据吻合良好。从欧拉和拉格朗日观点分析了尖端泄漏空化流的演化，涉及尖端泄漏涡（TLV），尖端分离涡（TSV）和诱导涡（IV）。结果表明，尖端泄漏空化流的空间演化可以分为三个阶段：第一阶段，TLV和TSV的独立发展：第二阶段，TLV和TSV的融合；第三阶段，IV的开发和TLV的耗散。从数值结果获得的拉格朗日相干结构（LCSs）表明，TLV空化显着影响了局部流型。然后使用涡度传输方程式进一步分析了空化对涡旋的影响。结果表明，拉伸项主导了TLV的演化，而膨胀项则导致了TLV腔内涡度的降低。结果还表明，空化如何影响局部湍流，湍动能方程中的输运项影响TLV腔附近的湍流分布。 （C）2019 Elsevier Inc.保留所有权利。

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  • 来源
    《Applied Mathematical Modelling》 |2020年第1期|788-809|共22页
  • 作者

    Cheng H. Y.; Bai X. R.; Long X. P.; Ji B.; Peng X. X.; Farhat M.;

  • 作者单位

    Wuhan Univ Sch Power & Mech Engn State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Hubei Peoples R China|Hubei Key Lab Waterjet Theory & New Technol Wuhan 430072 Hubei Peoples R China|Ecole Polytech Fed Lausanne Lab Hydraul Machines Lausanne Switzerland;

    Wuhan Univ Sch Power & Mech Engn State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Sch Power & Mech Engn State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Hubei Peoples R China|Hubei Key Lab Waterjet Theory & New Technol Wuhan 430072 Hubei Peoples R China;

    China Ship Sci Res Ctr Natl Key Lab Ship Vibrat & Noise Wuxi 214082 Jiangsu Peoples R China;

    Ecole Polytech Fed Lausanne Lab Hydraul Machines Lausanne Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tip leakage vortex (TLV); Cavitation; Lagrangian coherent structures (LCSs); Turbulence kinetic energy;

    机译：尖端泄漏涡（TLV）;空化拉格朗日相干结构（LCS）;湍动能;

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