NON-UNIFORM ARRAY IMPINGEMENT ON A CURVED SURFACE

Experiments to investigate the effect of varying jet hole diameter and jet spacing on heat transfer from jet array impingement on a curved target surface are reported. The jet plate configurations studied have varying hole diameters and geometric spacing for spatial tuning of the heat transfer behaviour. The configuration also includes a straight section downstream of the curved section, where the effect on heat transfer and pressure loss is also investigated. For all configurations, spent air is drawn out in a single direction which is tangential to the target plate curvature. First row jet Reynolds numbers ranging from 50,000 to 160,000 are reported. The jet plate holes are sharp-edged. A steady-state measurement technique utilizing temperature sensitive paint (TSP) was used on the target surface to obtain heat transfer coefficients. Pressure taps placed on the sidewall and jet plate of the channel were used to evaluate the flow distribution in the impingement channel. Alongside the experimental work, CFD simulations were performed utilizing the v(2)-f eddy viscosity turbulence model to understand better the relationship between the flow field and the heat transfer on the target surface. The results from this study are compared against past results for uniform array impingement on flat surfaces.