Management of a Stronger Wall Jet by an Embedded Streamwise Vortex : Reynolds Stresses Distributions and Evaluation of the Vorticity Transport Equation

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概要

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• An experimental study was carried out on the Reynolds stress distributions and production terms involved in the vorticity transport equation in a three-dimensional turbulence field of a stronger wall jet managed by an embedded streamwise vortex. Even in the strong three-dimensional flow field the mean velocity gradients 〓U / 〓y and 〓U / 〓z are of primary importance to the quantitative feature of the Reynolds shear stresses -<uv>^^^- and -<uw>^^^-, such as the maximal and minimal in their cross-stream distribution at a local streamwise position, respectively. A hypothesis of spanwise wandering of the introduced streamwise vortex was presented, to understand the large quantitative discrepancy in the stress-strain relationship between the Reynolds stress -<uw>^^^- and the rate of strain S_<yz>. The non-isotropic and non-uniform distributions of Reynolds stresses play a dominant role on the decay of the streamwise vortex. In a comparison with some results obtained in turbulent boundary layers disturbed by streamwise vortices, structural differences between the wall jet and the boundary layer reveal in the non-isotropy of the Reynolds shear stresses, -<uv>^^^- and -<uw>^^^-.

• 一般社団法人日本機械学会の論文
• 1999-02-15

著者

• Osaka Hideo

  Department Of Mechanical Engineering Yamaguchi University

• Osaka Hideo

  Department Of Mechanical Engineering

• MOCHIZUKI Shinsuke

  Department of Mechanical Engineering, Yamaguchi University

• Mochizuki Shinsuke

  Department Of Mechanical Energy Engineering Yamaguchi University

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