Numerical investigation of a single jet impingement on a flat surface using a cubic k-ε non-linear eddy viscosity model, to predict the effect of cooling on gas turbine blades
{"title":"Numerical investigation of a single jet impingement on a flat surface using a cubic k-ε non-linear eddy viscosity model, to predict the effect of cooling on gas turbine blades","authors":"N. Mostafa","doi":"10.1109/ICEENVIRON.2009.5398641","DOIUrl":null,"url":null,"abstract":"The ability to accurately predict the effect of cooling on gas turbine blades is essential in designing the blades that will operate at extremely high temperature. The standard k-ε linear eddy viscosity model is known to be inaccurate in predicting highly complex flows. Thus, a relatively new cubic k-ε non-linear eddy viscosity model was tested to ascertain whether it has improved the performance of eddy viscosity models. A single jet impingement on a flat plate with surface-to-nozzle distance of H/D = 6 was investigated numerically using a cubic k-ε non-linear eddy viscosity model of Craft et. al. [1] and high-Re k-ε linear eddy viscosity model of Jones & Launder [2]. Both use standard wall-function to model the near-wall flow. Dynamic field profiles taken at certain distances away from the impingement point were compared with experimental results of Cooper et al. [3]. The heat transfer field results were compared with the experimental data of Baughn et al. [4]. The dynamic field results show that the cubic non-linear model gives a much better prediction than the linear model. The heat transfer results showed that the linear model over-predicted the heat transfer rate at the stagnation point whilst the non-linear model gave under-prediction due to a lower prediction of the turbulent kinetic energy at that region.","PeriodicalId":211736,"journal":{"name":"2009 3rd International Conference on Energy and Environment (ICEE)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 3rd International Conference on Energy and Environment (ICEE)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICEENVIRON.2009.5398641","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The ability to accurately predict the effect of cooling on gas turbine blades is essential in designing the blades that will operate at extremely high temperature. The standard k-ε linear eddy viscosity model is known to be inaccurate in predicting highly complex flows. Thus, a relatively new cubic k-ε non-linear eddy viscosity model was tested to ascertain whether it has improved the performance of eddy viscosity models. A single jet impingement on a flat plate with surface-to-nozzle distance of H/D = 6 was investigated numerically using a cubic k-ε non-linear eddy viscosity model of Craft et. al. [1] and high-Re k-ε linear eddy viscosity model of Jones & Launder [2]. Both use standard wall-function to model the near-wall flow. Dynamic field profiles taken at certain distances away from the impingement point were compared with experimental results of Cooper et al. [3]. The heat transfer field results were compared with the experimental data of Baughn et al. [4]. The dynamic field results show that the cubic non-linear model gives a much better prediction than the linear model. The heat transfer results showed that the linear model over-predicted the heat transfer rate at the stagnation point whilst the non-linear model gave under-prediction due to a lower prediction of the turbulent kinetic energy at that region.