周期的変動を付加した縦渦による壁面噴流の操縦 : 周期平均操作による解析(流体工学,流体機械)

概要

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In a stronger wall jet managed by a streamwise vortex, effect of periodic perturbation on the interaction and evolution processes has been investigated in the equations derived from phase averaging and triple decomposition. Transverse and spanwise locations of vortex center have time variations associated with variation in strength of streamwise vortex. Normal Reynolds stress difference ([numerical formula]) and shear stress [numerical formula] generated by periodic perturbation reduce decay rate of maximum vorticity and accelerate growth rate of spanwise vortex radius in terms of production terms in transport equation for streamwise vorticity. Prediction of Reynolds shear stress component [numerical formula] by taking account of time variation of both vortex center and strength successfully explains experimental data of conventional time average stress of <vw>^^^-.
社団法人日本機械学会の論文
2004-06-25