Film cooling is one of the most efficient cooling methods and most widely used for high-temperature components. While, the produced Counter Rotating Vortex Pair (CRVP) by cylindrical holes weakens the cooling effectiveness, since it induces the unexpected mixing between coolant and hotstream, and the lift-off of coolant. The desire to overcome the unfavorable effects of CRVP and thus efficiently improve cooling effectiveness promotes various new combined-hole designs for film cooling. In this review paper, a summary of previous progress on film cooling and a special focus on recent literature related to the combined-hole film cooling designs with less difficulty in machining are provided. The underlying mechanisms of the enhancement in cooling effectiveness and film coverage due to anti-kidney vortex structure by combined holes are analyzed. Some perspectives on future prospects are finally addressed.

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