Construction of Simultaneous Measurement System of Unsteady Thermal and Flow Fields in the Near-Wall Region Using High-Speed Infrared Thermography and PIV

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  • 高速赤外線カメラとPIVを用いた非定常熱流動場の壁近傍における同時計測システムの構築

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In the present study, a combined system of particle image velocimetry (PIV) and a high-speed infrared thermography (IRT) was employed to investigate turbulent flow in the unsteady thermal and flow fields. Simultaneous measurements of the velocity near a wall and the temperature on a heated thin-foil were conducted. The heat transfer coefficient was obtained from the temporal and spatial temperature data recorded at the thin-foil surface. Reynolds numbers based on main flow velocity and momentum thickness were 630, 1,050, 1,540, 2,290 at 10mm upstream from the heating start point. Uncertainties at the 95% confidence interval of the measured heat transfer coefficient and velocity are 2.8% and 2.4%, respectively. In the thermal and flow fields, the spatial distribution of heat transfer coefficient on the heated foil is similar to that of the streamwise velocity near the wall-region. It is concluded that there is the strong positive correlation between the fluctuations of the heat transfer coefficient and the streamwise velocity by the statistical procedure.

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