关键词: 可压缩湍流+;湍流模型;超音速混合层;燃烧;数值仿真

Abstract: To study compressibility effect in supersonic combustion,three additional terms(including structured compressibility and dilatational compressibility correction terms) were proposed to improve the standard k-ε turbulence model predictions.Combined comprehensive kinetics mechanics of H2/air(GRI-Mech 2.11,10 components,28 reactions),standard k-ε model,modified k-ε model and Reynolds Stress Model(RSM) were examined by simulations of wall bounded supersonic mixing layers under nonrective and reactive conditions.Comparisons of the results of the three models were made with experimental measurements.Both solid wall and combustion affect turbulence notably. Modified turbulence model gives better predictions than the other two models.Also the new model predicts compressed mixing layers and a narrow reaction zone,which are closer to measurements.

Key words: Compressible turbulence+;Turbulence model;Supersonic mixing layers;Combustion;Numerical simulation