Measurements of temperature fields within film-cooling jets injected from a row of compound angle holes

Thermal fields downstream of the film-cooling jets injected through compound angle holes in a row have been measured with variations of the orientation angle and the blowing ratio. Detailed temperature distributions within the heated jets are reported for four orientation angles of 0 deg, 30 deg, 60 deg and 90 deg with three blowing ratios of 0.5, 1.0 and 1.5. The inclination angle, span-to-diameter ratio and length-to-diameter of the injection holes are fixed at 30 deg, 3.0 and 4.0, respectively, throughout the experiments. The result shows that the increase of the orientation angle results in uniform spanwise film coverage and improved film-cooling performance. The compound angle effects are found to be dominant in the case that the orientation angle is larger than 60 deg, especially when the blowing ratio is higher than unity.