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Numerical study of air-jet vortex generators in a turbulent boundary layer

机译：湍流边界层中喷气涡流发生器的数值研究

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摘要

The air-jet vortex generator has been proposed as a credible alternative to the more conventional vane vortex generator. Numerical models of the flow in the neighbourhood of these devices have been constructed to evaluate their potential benefits. The objective of this paper is to consider the sensitivity of a numerical model of a single air-jet vortex generator to the way in which the jet is modelled. The flows were assumed fully turbulent and were solved using the finite volume, Navier-Stokes Code CFX 4 (CFDS, AEA Technology, Harwell) on a non-orthogonal, body-fitted, grid using the k-ε turbulence model and standard wall functions. Streamwise and cross-stream velocity profiles are presented to describe the vortex strength and position. Predicted results were also compared with experimental data. A reasonably good match was observed between the predicted and the experimental streamwise velocity data. However, the magnitudes of the predicted cross flow velocity components were rather weak compared to those of the experiments. The results indicate that the downstream behaviour of the predicted vortex is largely unaffected by the shape of the velocity profile of the incoming jet.
机译：已经提出了喷气涡流发生器作为更常规的叶片涡流发生器的可靠替代。已经构建了这些设备附近流动的数值模型，以评估其潜在利益。本文的目的是考虑单个喷气涡流发生器数值模型对射流建模方式的敏感性。假定流动完全湍流，并使用有限体积的Navier-Stokes代码CFX 4（CFDS，AEA Technology，Harwell）在非正交，贴身网格上使用k-ε湍流模型和标准壁函数求解。提出了沿流向和跨流的速度曲线，以描述涡旋强度和位置。预测结果也与实验数据进行了比较。在预测的和实验的流速度数据之间观察到相当好的匹配。但是，与实验相比，预测的横流速度分量的大小相当弱。结果表明，预测涡流的下游行为在很大程度上不受传入射流速度分布图形状的影响。

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  • 来源
    《Applied Mathematical Modelling》 |2003年第5期|p.359-377|共19页
  • 作者

    Christoph Kuepper; Frank S. Henry;

  • 作者单位

    Department of Aeronautical, Civil and Mechanical Engineering, School of Engineering and Mathematical Sciences, City University, Northampton Square, London EC1V 0HB, UK;

  • 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 应用数学;
  • 关键词

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