期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：3
页码：1284
DOI：10.15680/IJIRSET.2015.0403047
出版社：S&S Publications
摘要：Jet impingement systems provide an effective means for the enhancement of convective processes dueto the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets arebeing used in is wide. In the annealing and tempering of materials, impinging jet systems are finding use in the coolingof hot metal, plastic, or glass sheets as well as in the drying of paper and fabric. Compact heat exchangers, withapplications in the aeronautical or the automotive sector, often use multiple impinging jets in dense arrangements. Ingas turbine applications, jet impingement has been routinely used for a long time. Because of increased thermalefficiency at high turbine inlet temperatures, many gas turbine components, such as rotor disks, turbine vanes andblades, or combustion chamber walls, are operated at temperatures well above highest allowable material limits. Inorder to assure durability and long operating intervals, effective cooling concepts are required for these highly loadedcomponents.The current work involves studying of effect of spanwise jet-to-jet spacing on local heat transferdistribution due to an in-line rectangular array of confined multiple circular air jets impinging on a surface parallel tothe jet plate computationally. Shear Stress Transport (SST) k-ω turbulence model is used. The flow, after impingement,is constrained to exit in two opposite directions from the confined passage formed between jet plate and target plate.Mean jet Reynolds numbers based on the nozzle exit diameter (d) covered is 10,000 and jet-to-plate spacings studiedare d, 2d and 3d. Spanwise pitches considered are 2d, 4d and 6d in steps of 2d keeping the streamwise pitch at 5d.Length-to-diameter ratio of nozzles of the jet plate is 1.0. For all the configurations, the jet-plates have ten spanwiserows in streamwise direction and six jets in each spanwise row. The results obtained are validated against theexperimental data available in the open literature.
关键词：Jet impingement; Shear stress transport (SST) model k-ω turbulence model.
