円管乱流噴流の近傍場に関する実験

概要

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An experiment is conducted to reveal the near field characteristics of the axisymmetric jet discharged from a sufficiently long circular pipe in which a fully-developed turbulent flow has been achieved at the exit plane. Two different configurations of the pipe exit are tested in order to examine their effect on the jet development. Up to an axial distance of about 4d (d is the inner diameter of the pipe), it is found that the mean velocity and turbulence intensity in the core region show relatively more gradual variation, and the volume flux is larger, compared to those found in the jet with a potential core. At further downstream stations, various flow properties exhibit qualitatively the same behaviour as the jet with a potential core. Turbulence quantities in the jet with a right-angle flange at the pipe exit are slightly but consistently larger than in the jet with a thin lip. Marked differences in turbulence quantities and the entrainment rate are observed between the present data and Boguslawski-Popiel's data in spite of both being obtained from similar experimental conditions.
一般社団法人日本機械学会の論文
1988-06-25