1147 逆圧力勾配下の平衡境界層における平均量分布

概要

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Adverse pressure gradient effect on the local similarities in turbulent boundary layers was investigated experimentally under the equilibrium condition with power law variation of free stream velocity. An equilibrium boundary layer in which equations of motion can be reduced to an ordinal differential equation with liner development of length scale and constant sin friction coefficient was established over certain streamwise extent, x=4.35∿4.7[m]. In logarithmic velocity profile, Karman constant takes the same value of κ=0.41 under zero pressure gradients, however, additive constant is somewhat smaller than C=5.0. New power law was applied to velocity defect profile in the outer layer and difference between zero pressure gradients and adverse pressure gradient was found in additive constant.
社団法人日本機械学会の論文
2002-09-20