S0502-7-1 十分発達した円管乱流の粗面壁撹乱に対する応答([S0502-7]噴流,後流および剥離流れ現象の解明と制御(7))

概要

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Hot wire measurement was carried out to find the response of the turbulent structure in fully developed pipe flow to two types of roughness, d-type and k-type. The measurements were emphasized on the response processes relating to types of roughness. The root mean square of fluctuating velocities components and Reynolds shear stress were investigated according to effectiveness of roughness. Comparison has been made on the turbulence data between smooth wall flow and two types of rough wall flow. The turbulence intensities of both types of roughness propagate from the vicinity of wall to the pipe center. Comparison on production term, both Reynolds shear stress and velocity gradient of k-type change largely from smooth wall condition but only changes of Reynolds shear stress is found in d-type.
一般社団法人日本機械学会の論文
2010-09-04