Experimental Film Cooling Effectiveness of Three-Hole-Branch Circular Holes

Figure 4

Details of the film cooling hole geometries. (a) Case of the three holes with the same inclination angle of 30°. (b) Case of middle (primary) hole with an inclination angle of 30° and the two side holes with an inclination angle of 37.5°. (c) Case of middle (primary) hole with an inclination angle of 30° and the two side holes with an inclination angle of 45°.

(a)

(b)

(c)