Numerical study of optimum parameter design for film cooling effectiveness by Taguchi method

• Published in: The International journal of heat and fluid flow 2023-04, Vol.100, p.109118, Article 109118
• Main Authors: Ouyang, Kwan, Chen, Tseng-Yuan, Wu, Jun-You
• Format: Article
• Language: English
• Subjects: Barchan-dune-shaped ramp; Film cooling; Numerical simulation; Tab; Taguchi method
• ISSN: 0142-727X; 1879-2278
• DOI: 10.1016/j.ijheatfluidflow.2023.109118

•To improve cooling performance, the present numerical study proposed a novel film cooling scheme that combines a cylindrical film hole with an upstream Barchan-dune ramp and a triangular tab over the hole.•Numerical results showed that the Barchan-dune ramp and the triangular tab could induce an anti-kidney vortex pair to suppress the penetration of cooling flow into high-temperature mainstream.•The present study used the Taguchi method to determine an optimum parameter design of film cooling effectiveness. Three control factors were investigated, namely, ramp height, tab length, and blowing ratio.•Analysis of variance showed that the blowing ratio is the most significant factor among the three control factors. At the optimum parametric design, 34.1% of average film cooling effectiveness can be achieved. The present numerical study investigated a novel film cooling scheme that combines a cylindrical hole with an upstream Barchan-dune ramp and a triangular tab over the hole. Simulations revealed that this arrangement can induce an additional anti-kidney vortex pair on the outside of the original primary kidney vortices to suppress the penetration of the high-temperature mainstream by the cooling flow, increasing cooling effectiveness. Compared with schemes employing only a triangular tab or a Barchan-dune ramp, the novel film cooling scheme achieved superior cooling performance. An optimum parameter design is determined through the Taguchi method. Three parameters were investigated, namely, the Barchan-dune-shaped ramp height, triangular tab length, and blowing ratio, under various incoming temperatures. Analysis of variance revealed that the blowing ratio has the greatest influence on cooling effectiveness. An average cooling effectiveness of 34.1% was achieved by the optimum parameter design.