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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of turbulence modelling on non-equilibrium condensing flows in nozzle and turbine cascade
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Influence of turbulence modelling on non-equilibrium condensing flows in nozzle and turbine cascade

机译：湍流模型对喷嘴和涡轮叶栅中非平衡冷凝流的影响

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摘要

The accurate analysis of a condensing flow plays an important role in the development of high-efficiency steam turbines. This paper presents an investigation of turbulence modelling influence on non-equilibrium condensing steam flows in a Laval nozzle and in a stationary cascade of turbine blades using a commercial computational fluid dynamics (CFD) code. The calculations were conducted by employing 2D compressible Reynolds-averaged Navier-Stokes (RANS) equations coupled with a two equation turbulence model. The condensation phenomena were modelled on the basis of the classical nucleation theory. The standard k-ε turbulence model was modified, and the modifications were implemented in the CFD code. The influence of inlet flow turbulence on condensing process was discussed. The impact of turbulence modelling on wet-steam flow was examined based on the experimental data available in the literature. The cascade loss coefficients were calculated numerically as well. The presented study of losses that occur due to the irreversible heat and mass transfer during the condensation process emphasised the importance of turbulence modelling for wet-steam flows in turbines. The paper demonstrates that the accurate computational prediction of condensing steam flow requires the turbulence to be modelled accurately.
机译：冷凝水的精确分析在高效蒸汽轮机的开发中起着重要作用。本文利用商业计算流体力学（CFD）代码研究了湍流建模对Laval喷嘴和涡轮叶片固定级联中非平衡冷凝蒸汽流的影响。通过使用二维可压缩雷诺平均Navier-Stokes（RANS）方程以及两个方程湍流模型进行计算。冷凝现象是在经典成核理论的基础上建模的。修改了标准k-ε湍流模型，并在CFD代码中实现了这些修改。讨论了入口湍流对冷凝过程的影响。基于文献中提供的实验数据，检查了湍流模型对湿蒸汽流动的影响。级联损耗系数也通过数值计算。提出的关于凝结过程中不可逆的热量和质量传递造成的损失的研究强调了湍流模型对涡轮机湿蒸汽流动的重要性。本文证明，冷凝水流的精确计算预测需要对湍流进行精确建模。

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  • 作者

    Yogini Patel; Giteshkumar Patel; Teemu Turunen-Saaresti;

  • 作者单位

    Fluid Dynamics Laboratory, LUT Energy, School of Technology, Lappeenranta University of Technology, PO Box 20, FIN-53851 Lappeenranta, Finland;

    Fluid Dynamics Laboratory, LUT Energy, School of Technology, Lappeenranta University of Technology, PO Box 20, FIN-53851 Lappeenranta, Finland;

    Fluid Dynamics Laboratory, LUT Energy, School of Technology, Lappeenranta University of Technology, PO Box 20, FIN-53851 Lappeenranta, Finland;

  • 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

    CFD; Condensation; Steam; Turbulence modelling; Loss coefficient;

    机译：差价合约缩合;蒸汽;湍流建模;损耗系数;

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