Influence of Compound Angle on Effusion Cooling Effectiveness Through Inclined Holes in Curved Wall

Numerical simulation and experimental research were conducted to investigate the distribution of flow field and film cooling effectiveness at a blowing ratio of 3.5 in the combustion chamber under the condition of curved wall, in which the compound angle of multi-inclined holes is 0°, 30° and 65°. Results show that compared with the model of 0°, the introduction of compound angle enhances the spanwise diffusion of cooling air flow, and the film has better overlapping effect between two adjacent rows of holes, resulting in increased cooling efficiency, weakened diffusion in height direction, declined involvement with high-temperature gas, and increased length of film coverage. When the compound angel is increased from 30° to 65°, the cooling efficiency improves slightly, while the discharge coefficient shows a tendency to increase first and then decrease with the rise of compound angle.