Large Eddy Simulations for Film Cooling Assessment of Cylindrical and Laidback Fan-Shaped Holes With Reverse Injection

Singh, Ashutosh Kumar; Singh, Kuldeep; Singh, Dushyant; Sahoo, Niranjan

Abstract

The large eddy simulations (LES) are performed to access the film cooling performance of cylindrical and reverse shaped hole for forward and reverse injection configurations. In the case of reverse/backward injection, the secondary flow is injected in such a way that its axial velocity component is in the direction opposite to mainstream flow. The study is carried out for a blowing ratio (M =1), density ratio (DR =2.42), and injection angle (α = 35 deg). Formation of counter-rotating vortex pair (CRVP) is one of the major issues in the film cooling. This study revealed that the CRVP found in the case of forward cylindrical hole which promotes coolant jet "liftoff" is completely mitigated in the case of the reverse shaped hole. The coolant coverage for reverse cylindrical and reverse shaped holes is uniform and higher. The reverse shaped hole shows promising results among investigated configurations. The lateral averaged film cooling effectiveness of reverse shaped hole is 1.16-1.42 times higher as compared to the forward shaped holes. The improvement in the lateral averaged film cooling effectiveness of reverse cylindrical hole (RCH) injection over forward cylindrical hole (FCH) injection is 1.33-2 times.

Citation

Singh, A. K., Singh, K., Singh, D., & Sahoo, N. (2021). Large Eddy Simulations for Film Cooling Assessment of Cylindrical and Laidback Fan-Shaped Holes With Reverse Injection. Journal of Thermal Science and Engineering Applications, 13(3), Article 031027. https://doi.org/10.1115/1.4048679

• Journal Article Type: Article
• Acceptance Date: Sep 23, 2020
• Online Publication Date: Nov 11, 2020
• Publication Date: 2021-06
• Deposit Date: Jun 22, 2021
• Publicly Available Date: Aug 3, 2023
• Journal: Journal of Thermal Science and Engineering Applications
• Print ISSN: 1948-5085
• Electronic ISSN: 1948-5093
• Publisher: American Society of Mechanical Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 3
• Article Number: 031027
• DOI: https://doi.org/10.1115/1.4048679
• Keywords: Fluid Flow and Transfer Processes; General Engineering; Condensed Matter Physics; General Materials Science
• Public URL: https://nottingham-repository.worktribe.com/output/5501281
• Publisher URL: https://asmedigitalcollection.asme.org/thermalscienceapplication/article-abstract/13/3/031027/1087819/Large-Eddy-Simulations-for-Film-Cooling-Assessment