静止流体中の回転円筒まわりの乱流せん断流

概要

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An experimental study has been performed on the structures of the mean flow and turbulent fields around a cylinder spinning in a quiescent fluid. Two kinds of cylinders, each different in diameter, have been used in this experiment. Measured mean velocity profiles are found not to obey the conventional logarithmic law at all. Instead, they are satisfactorily expressed by the different law of the wall, logarithmic law and defect law, deduced in this study, from those of the flat-plate turbulent flow. A gradient Richardson number computed from the mean flow data is always negative and reaches its minimum value -0.5 in the middle region of the shear layer. In the outermost part of the layer, the mean velocity behaves as 1/γ although the flow is turbulent ; this behaviour can be inferred from the defect law representation. Discussion is made about the balances of the radial mean momentum and the turbulent kinetic energy.
一般社団法人日本機械学会の論文
1983-10-25