Experimental and Numerical Investigation of Cylindrical and Shaped Cooling Holes With Forward and Reverse Injection

Gaurav, Raj; Singh, Ashutosh Kumar; Singh, Kuldeep; Singh, Dushyant

Abstract

The present work proposes a suitable injection hole configuration of cylinder and laidback fan-shaped with forward and reverse direction for film cooling of a gas turbine blades application, based on experimental and numerical analysis. The experimental study is conducted for cylindrical hole at blowing ratio (1), injection angle (35°), and density ratio (1.2). The numerical study is performed for a wide range of operating parameters such as blowing ratios on (1-3), density ratios (2.42), mainstream flow Reynolds number as 4000 based on the hydraulic diameter of wind tunnel channel and, injection angle (35°) with the effect of forward and reverse injection of laidback fan shaped. The present study reveals that the formation of kidney vortices mitigated for reverse-shaped holes (secondary air is injected such that its axial velocity component is in the reverse direction to that of the mainstream) results in higher cooling performance with respect to forward-shaped holes. The coolant coverage is likewise more consistent and higher in the lateral direction compared to the forward injection.

Citation

Gaurav, R., Singh, A. K., Singh, K., & Singh, D. (2024). Experimental and Numerical Investigation of Cylindrical and Shaped Cooling Holes With Forward and Reverse Injection. Heat Transfer Engineering, https://doi.org/10.1080/01457632.2024.2317612

• Journal Article Type: Article
• Acceptance Date: Feb 12, 2024
• Online Publication Date: Feb 26, 2024
• Publication Date: Feb 26, 2024
• Deposit Date: Mar 5, 2024
• Publicly Available Date: Feb 27, 2025
• Journal: Heat Transfer Engineering
• Print ISSN: 0145-7632
• Electronic ISSN: 1521-0537
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1080/01457632.2024.2317612
• Public URL: https://nottingham-repository.worktribe.com/output/32166768
• Publisher URL: https://www.tandfonline.com/doi/full/10.1080/01457632.2024.2317612
• Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Heat Transfer Engineering on 26.02.24, available at: https://www.tandfonline.com/doi/full/10.1080/01457632.2024.2317612