Flow and heat transfer analysis on impingement/effusion cooling configuration including jet orifices with conformal pins

Abstract

An improving impingement/effusion cooling configuration including jet orifices with conformal pins is investigated by computational fluid dynamics numerical simulation. Two groups of configurations are adopted for comparisons to investigate the flow and conjugate heat transfer characteristics. The proposed configurations with long round holes and fan-shaped holes are applied to evaluate the influences of film hole geometry with thin outer wall, in comparison to typical thin double-wall configuration. Film protection behavior, internal heat transfer pattern, and overall cooling performance are determined at various Reynolds number. Meanwhile, the effects of reducing wall thickness with fixed length-to-diameter ratio for impingement/effusion cooling system with round holes as well as fan-shaped holes are investigated at different blowing ratios with respect to overall cooling performance. Furthermore, the solid temperature gradient distribution and dimensionless pumping power are taken into consideration comprehensively. The results indicate that the proposed configuration with fan-shaped holes achieves the highest overall cooling effectiveness by 5%–40% higher than typical double-wall between jet Reynolds number of 470–3780 and performs the best thermo-hydraulic performance.