乱流のカルマン渦列の正浮力による崩壊消滅に与える渦発生物体の形状の影響 : 熱工学, 内燃機関, 動力など

概要

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Effects of shape of bluff body on suppression of turbulent Karman vortex street due to positive buoyancy are elucidated experimentally as follows : Almost of the turbulent energy in an isothermal wake is maintained in a positively buoyant wake. The vortex vorticity in a turbulent wake behind a prism cylinder decreases more remarkably due to positive buoyancy than a circular cylinder wake. In a turbulent wake, the critical Froude number, Fr_<crit>, where the Karman vortex street is suppressed due to positive buoyancy, of a prism cylinder wake is the same as that of a circular cylinder wake. Shape of a bluff body therefore has no effect on Fr_<crit> in a turbulent wake. Furthermore, the Karman vortex street in a turbulent wake behind a prism cylinder is suppressed more easily than a laminar wake.
一般社団法人日本機械学会の論文
2001-01-25