乱流境界層に接する隙間に発生する圧力変動(流体工学,流体機械)

概要

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This paper presents results of an experimental study on pressure fluctuation occurring at the inside of narrow slots beneath turbulent boundary layers. Experiments were carried out at a Reynolds number range of 3×10^4<Re_θ<1.25×10^5 using a large re-circulating water tunnel. Fluctuating pressure was measured for three types of slots; two spanwise slots of 1mm and 3mm width and a streamwise slot of 1mm width. In case of spanwise slots, measured pressure spectra show 4-6dB lower values than those measured on smooth surface. However, obtained two-point cross-spectral densities reveal that pressure fluctuations at the inside of the spanwise slot are more coherent than those measured on smooth surface. In case of streamwise slot, pressure fluctuation levels increase remarkably at a low frequency range.
2010-02-25