乱流二次元空気噴流の傾斜衝突(実験)

概要

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Impinging air jets are used in the wide industrial fields for floating, cleaning, heating, cooling and drying because of the remarkable heat and mass transfer in the impingement region of turbulent jets. However, the flow characteristics with in this region have not yet investigated in detail on account of complexity in the impinging jet flow and lacking in a suitable measuring device like LDV. In this paper, a two-dimensional (plane) air jet is blown obliquely with several angles onto a flat wall from various jet nozzle heights, and I type probe of hot-wire anemometer (H.W.) and a fringe mode Laser Doppler Velocimeter (LDV) with a tracker type signa1 processor have been used a measure the distributions of mean velocity and turbulence intensity in both the impingement and wall jet regions, and further, the wall static pressure has also been determined. From these experimental results, the height and width of the impingement region have been found to be nearly constant irrespective of the impinging height and angle. In this region it can be seen that both the distributions of wall velocity and turbulence intensity measured by LDV show a reasonable agreement with those obtained by H.W., and the above distributions are also similar to those obtained in the wall jet region regardless of the impinging height and angle.
東海大学の論文