吸込みおよび吹出しによる後向きステップを有するチャネル乱流の制御(熱工学,内燃機関,動力など)

概要

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Experiments have been performed for a turbulent channel flow over a backward-facing step. The backward-facing step is controlled by equipping a slit at the bottom corner of the step. Low momentum fluids in the recirculating region are sucked or high momentum fluids are injected from the slit. The width of the slit is changed between 2, 3 and 5mm, and the flow ratio is varied from 0.00 to 0.15. The wall static pressure and local heat transfer coefficient are measured behind the bakward-facing step. The wall shear stress is measured using the micro flow sensor. In addition, the velocity profiles and turbulent intensities are measured by a split hot film probe. It is found that the heat transfer and pressure drop characteristics are controlled by the flow ratio. When the suction flow ratio is 0.06, the highest performance is obtained. Enhancement of the heat transfer is related to the increase of turbulence intensity.
一般社団法人日本機械学会の論文
2004-02-25