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ISSN オンライン: 2642-0554

TURBULENCE CHARACTERISTICS OF COUETTE-POISEUILLE TURBULENT FLOWS

Koichi Nakabayashi
Department of Mechanical Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Osami Kitoh
Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555

Yoshitaka Katou
Toyota Communication System Co., Ltd. Higashi-Sakura Daiichi Bldg. 7F, Higashi-Sakura, Higashi-ku, Nagoya 461-0005, Japan

要約

Turbulence characteristics of Couette-Poiseuille turbulent flow (C-P flow) have been studied experimentally. In the wall region, turbulence characteristics are strongly influenced by dimensionless parameter of the shear stress gradient μ, but not much by Reynolds number Re*. In the core-region, however, there is a great difference in the distribution of turbulence intensity between P-and C-types. For P-type, an effective friction velocity and a new coordinate η = y−δp can be used for the universal profile, whereas for C-type, the local scaling and the wall coordinate y are adequate. For μ = 0~55, the sweep event contributes more to the Reynolds shear stress than that by ejection.