後向きステップを有するチャネル乱流の受動的制御 : 流動特性(流体工学,流体機械)

概要

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A turbulent channel flow over a backward-facing step is investigated experimentally under controlled by equipping a slit upstream of the step. High-speed fluid is led to the recirculating region through the slit. In order to investigate the relationship between fluid flow and heat transfer characteristics, the velocity profiles, turbulent intensities of velocity fluctuation and Reynolds shear stress were measured in detail by the particle image velocimetry (PIV). In addition, the wall shear stress was also measured by the micro flow sensor. The statistical properties, i.e., turbulent diffusions, power spectra of velocity fluctuation, were investigated. It is found that enhancement of the heat transfer is related to the increase of streamwise velocity in the near-wall region and the increase of turbulence energy. When there is a slit, the prominent peak appears in the power spectra of the velocity fluctuation. It is shown that Karman vortex shedding exists.
一般社団法人日本機械学会の論文
2004-11-25