矩形狭流路内膜冷却に与えるギャップ高さの影響  [in Japanese] Effect of Gao Height on Film Cooling in Thin Rectangular Channel  [in Japanese]

Film cooling behavior in thin rectangular channel was studied experimentally by using water. The flow pattern and the wall temperature distribution were visualized with hydrogen bubbles and liquid crystal sheet, respectively. The wavy temperature distributions on the wall just after the injection slit was observed in spite of the two-dimensional film. The low and high temperature regions correspond to the high and low speed regions near the wall, respectively. As thinning the channel, the cooling efficiency was decreased and the wave length of the temperature pattern became smaller.