Abstract
Due to producing better film cooling performance, shaped film holes have attracted a lot of attentions and have been extensively studied. A spiral-channel hole, a new shaped film hole, is proposed to improve the film cooling effectiveness. The flow field, including flow structure inside film hole, velocity distribution and development of vortex pairs, of the spiral-channel hole and cylindrical hole are analyzed based on numerical simulation. And film cooling effectiveness of two types of holes is compared. Compared with the cylindrical hole, the averaged film cooling effectiveness of the spiral-channel hole improves by 97% and 667% in the case of M = 0.5 and M = 1.0, respectively. Inside the spiral-channel hole, the flow field appears a smaller separation zone and the streamline swirls and deviates significantly. The momentum of coolant at outlet of the spiral-channel hole is lower and more uniform in vertical direction and the lateral-velocity at outlet of the spiral-channel hole is larger. As a result, the coolant covers larger area in the spanwise distribution and its coverage area is three times larger than that of the cylindrical hole. The distribution and scale of the vortex, which is composed of large-scale vortex and small-scale vortex and distributes in the vertical direction, is completely different from the kidney vortex pair (cylindrical hole). Eventually, the vortex pairs in the vertical direction merge into a large-scale vortex. Since the destruction of the kidney vortex, this swirling structure is of great significance for improving the film cooling effectiveness.
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