Experimental and numerical heat transfer investigation of reverse jet impingement
Publication Date
December 31, 2023
Creator
Abstract
This project aimed to study heat transfer and flow in double wall aerofoil cooling using two primary studies: a novel jet impingement cooling geometry and a typical film cooling arrangement. Experimental testing with thermochromic liquid crystal validated numerical work using ANSYS Fluent.
A novel ‘reverse’ jet impingement geometry was developed to enhance heat transfer performance, comprising of a ‘dimple’ target enclosed within a cylindrical ‘silo’. Experimental variations included Reynolds number range of 10,000 to 70,000, jet-to-target, crossflow condition, and an extended nozzle geometry. An overall enhancement of heat transfer was achieved with the novel geometry, with optimum jet to target spacing found at around 4 jet diameters, and some reduction in crossflow effects were observed.
A numerical investigation validated against experimental data for a novel 'reverse' jet impingement geometry was conducted. Optimizations in jet-to-jet and jet-to-target spacing were found, but no significant optimization of inlet condition was observed. The effect of outlet condition on discharge coefficient was significant, with an optimum nozzle length of 1 jet diameter for heat transfer enhancement. Staggered and inline dimples were shown to provide similar enhancements to heat transfer, significantly compared to a traditional flat plate target.
The study evaluated heat transfer and discharge coefficients in a scaled cylindrical film cooling channel with varied Reynolds number, entry sharpness, inclination, and rotation angle.
Item Type
ethesis
Thesis Type
PhD
Supervisors
Subjects (LC)
Associated Schools / Departments
Faculty of Engineering
eprints ID
74017
UoN Repository URI
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Abdallah_Thesis_03082023.pdf
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