抄録
This paper presents an experimental study of film cooling on a flat surface using swirling jets through a row of discrete holes of 45° along streamwise direction. Experiments were conducted in a low speed wind tunnel and swirling jet was made by a twisted tape set in the injectant path. A thermal probe with thermo-couples was used to measure both film cooling effectiveness and dimensionless temperature. Three pairs of swirling jets were used, i.e., "clockwise-counterclockwise", "counterclockwise-clockwise" and "counterclockwise-counterclockwise". Furthermore, the pitches of swirling tape in the injectant path were also changed. The results show that the swirling jets for film cooling improve both distributions of film cooling effectiveness and dimensionless temperature on a flat surface.
