Impingement cooling using different arrangements of conical nozzles in a film cooled blade leading edge. (March 2020)

• Record Type: Journal Article
• Authors: Fawzy, Hamza; Zheng, Qun; Jiang, Yuting
• Is Part Of: International communications in heat and mass transfer. Volume 112(2020:Mar.)
• Publication Date: 2020-03
• Subjects: Impingement cooling -- Conical nozzle -- Film cooling -- Leading edge; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Heat -- Transmission; Mass transfer; Periodicals; 621.4022
• DOI: 10.1016/j.icheatmasstransfer.2020.104506
• Languages: English
• ISSNs: 0735-1933

Abstract

Abstract: In this paper, a combined internal and external blade cooling system is conducted numerically to study the effect of different nozzles arrangements on flow and heat transfer performance. The applied operating conditions are different values of Reynolds number ranging from 5000 to 25, 000 and different temperature ratios varied from 0.5 to 0.85. Results indicate that Nusselt number increases with the increase of Reynolds number at constant temperature ratio for all cooling models. The staggered normal cooling model achieves the highest overall Nusselt number with a maximum increase of 14.3% compared to the other cooling models. Overall film cooling efficiency increases with the increase in the corresponding blowing ratios. The staggered normal cooling model achieves superior overall cooling performance compared with the other cooling models. A correlation for overall Nusselt number is derived as a function of Reynolds number and temperature ratio.