Experimental and Numerical Heat Transfer Investigation of Impingement Jet Nozzle Position in Concave Double-Wall Cooling Structures

Wright, Edward; Ahmed, Abdallah; Yan, Yuying; Maltson, John; Arisso Lopez, Lynda Arisso

Abstract

In this paper, experimental and numerical study has been carried out to investigate impingement cooling with a row of five circular jets, varied between target positions on a realistic leading edge region of gas turbine blade geometry. Experimental data is collected from a transient thermochromic liquid crystal measurement technique at the target surface. Numerical study was conducted with the geometry using commercial computational fluid dynamics software to analyze the fluid flow. The unique aims of the study are to observe the effects of variation in jet location, and those specific to realistic target and nozzle geometries. Distributions of local and average Nusselt number show that a location targeting the concave surface at 90° demonstrates an overall higher heat transfer coefficient, especially in the stagnation region, and toward the airfoil sides, with significantly fewer swirls. The experiment was performed with the following parameters: distance from nozzle to target of 1.7 to 2.1 jet diameters, pitch between jets of 4.4 jet diameters, and concave target diameter of 8.0 jet diameters. The jet Reynolds number range during this test was 20,000 − 40,000. A standard flat target plate impingement test is also experimentally conducted and compared against existing literature for method validation.

Citation

Wright, E., Ahmed, A., Yan, Y., Maltson, J., & Arisso Lopez, L. A. (2022). Experimental and Numerical Heat Transfer Investigation of Impingement Jet Nozzle Position in Concave Double-Wall Cooling Structures. Heat Transfer Engineering, 43(13), 1108-1118. https://doi.org/10.1080/01457632.2021.1943842

• Journal Article Type: Article
• Acceptance Date: Jan 31, 2021
• Online Publication Date: Jun 17, 2021
• Publication Date: 2022
• Deposit Date: Feb 2, 2021
• Publicly Available Date: Jun 18, 2022
• Journal: Heat Transfer Engineering
• Print ISSN: 0145-7632
• Electronic ISSN: 1521-0537
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 13
• Pages: 1108-1118
• DOI: https://doi.org/10.1080/01457632.2021.1943842
• Keywords: Fluid Flow and Transfer Processes; Mechanical Engineering; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/5288915
• Publisher URL: https://www.tandfonline.com/doi/abs/10.1080/01457632.2021.1943842
• Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Heat Transfer Engineering on 17/06/2021], available online: https://doi.org/10.1080/01457632.2021.1943842.; ; Issue contains Selected Papers from the 16th UK Heat Transfer Conference (UKHTC2019), University of Nottingham, September 8-10, 2019, Nottingham, UK.