長方形噴流のせん断層に形成されるうずの挙動に関する研究

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  • An investigation on the vortex behaviour formed in the shear layer of the rectangular jet.
  • チョウホウケイ フンリュウ ノ セン ダンソウ ニ ケイセイサレル ウズ ノ

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This paper describes the vortex behaviour formed in the shear layer of the rectangular jet. Introducing the momentum thickness in the shear layer of the jet, the relation the Strouhal number of the jet breakdown and the velocity profile is uniform, the Strouhal number of the jet breakdown is a constant regardless of the Reynolds number. When the profile is nearly parabola, the Strouhal number increases with the Reynolds number. In addition, the relation between the wave-form of the velocity fluctuations and the frequency spectra, as well as flow visualization is investigated. When the vortex coalescence has occured, the wavelength is doubled and the frequency is halved.

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