Numerical Study on the Effects of Coolant Swirling Flow and Compound Angle of Air Film Hole on the Cooling Characteristics of Flat Plate Air Film
In order to explore the cooling mechanism of the air film of swirling coolant flow,the cooling efficiency and vortex structure of the flat film cooling flow field under the irrotational,clockwise coolant swirling flow and counterclockwise coolant swirling flow were analyzed by numerical calculation.The re-sults show that the coolant swirling flow can affect the symmetry of the kidney-shaped vortex pairs,which can increase the overall air film cooling efficiency by about 19.2％-20.8％compared with that of irrota-tional model without compound angle.Under the condition of coolant swirling flow,when adopting the air film holes with compound angle,the main stream will destroy the kidney-shaped vortex pairs and form a single vortex structure,and the cooling efficiency is about 101％higher than the irrotational cold air mod-el without compound angle.Compared with the irrotational cold air model without compound angle,the counterclockwise coolant swirling flow at compound angle increases the single vortex intensity,and the cooling efficiency is improved by 122.3％.The clockwise coolant swirling flow promotes the formation of anti-kidney vortex pair,which can significantly improve cooling efficiency by 180.8％.
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