关键词: 涡发生器；气膜冷却；吹风比；射流角度；实验研究

Abstract: To study the impact of inclination angle and blowing ratio on vortex generator enhancing film cooling effectiveness， the thermocouples were used to measure the film cooling effectiveness， the technology of particle image velocimetry (PIV) was used to capture the flow structure， and thus the effects of critical parameters such as inclination angle and blowing ratio on enhancing the film cooling effectiveness were investigated. The distribution of film cooling effectiveness and the flow structure at mid-span of geometries with and without vortex generators were measured at different inclination angles(α=20°， 30°， 40°) and blowing ratios(M=0.5， 1.0， 1.5). It is indicated that the vortex generator would significantly improve the film cooling effectiveness and the area-averaged film cooling effectiveness improves 249% at most. The film cooling effectiveness of the geometry without vortex generator would be decreased when the blow ratio and the inclination angle become larger. With the inclination angle of 20° and 30°， the film cooling effectiveness of the geometry with vortex generator would increase as the increase of blowing ratio. However， the film cooling effectiveness of corresponding geometry would be deteriorated with the inclination angle of 40°. When M=0.5， the film cooling effectiveness of the geometry with vortex generator would slightly increase as the increase of inclination angle， however， an opposite trend is shown when M=1.5. The effect of inclination angle becomes negligible when M=1.0.

Key words: Vortex generator；Film cooling；Blowing ratio；Inclination angle；Experimental study