重庆理工大学学报（自然科学版）2018，Vol.32Issue(4)：87-93,106,8.DOI:10.3969/j.issn.1674-8425(z).2018.04.014
波瓣喷嘴射流冲击平面靶板对流换热数值研究
Numerical Study on Convective Heat Transfer Characteristics of Lobed Nozzle Jet Impingement onto a Flat Target
摘要
Abstract
Numerical simulations of the jet impingement heat transfer on a flat target were performed under typical jet Reynolds numbers ranging from 10 000 to 20 000 and dimensionless impinging distances ranging from 2 to 8 by using the Realizable k-εturbulence model.Particular attention was paid to explore the differences between the lobed jet and conventional or round jet impingements at different impinging distances.The results show that the lobed nozzle produces array streamwise vortices downstream the nozzle outlet to enhance the mixing of jet with the surrounding air,resulting in distinct features of jet development and impingement heat transfer with the round jet.The effect of nozzle shape is tightly associated with the impinging distance.At a small impinging distance(such as H/d=2 and 4),the peak approaching velocity of lobed jet close to the target is found to be greater than the round jet,producing higher stagnation convective heat transfer and a lobe-shaped convective heat transfer distribution around the stagnation zone.While at a large impinging distance(such as H/d=6 and 8),the lobed jet is found to achieve more smooth velocity profile and less peak velocity related to the round jet approaching closely to the target,resulting in weaker stagnation convective heat transfer than the round jet.关键词
波瓣喷嘴/射流冲击/流动特性/换热特性/数值模拟Key words
lobed nozzle/jet impingement/flow characteristics/heat transfer characteristics/numerical simulation分类
航空航天引用本文复制引用
王博滟,张靖周,吕元伟..波瓣喷嘴射流冲击平面靶板对流换热数值研究[J].重庆理工大学学报（自然科学版）,2018,32(4):87-93,106,8.基金项目
国家自然科学基金资助项目(51776097) （51776097）
航空科学基金资助项目(2015ZB52019) （2015ZB52019）
