Mean and fluctuating velocity fields of a diamond turbulent jet

The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice（hereafter termed a ＂diamond jet＂） with an aspect ratio of 1.7.Velocity measurements were conducted in the transitional region,and the exit Reynolds number of the jet was 50000.For comparison,a round j...

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Bibliographic Details
Published inChinese physics B Vol. 22; no. 3; pp. 344 - 351
Main Author 徐敏义 张健鹏 米建春 Nathan G.J. Kalt P.A.M
Format Journal Article
LanguageEnglish
Published 01.03.2013
Subjects
Diamonds
Fluid dynamics
Maxima
Reynolds number
Shear
Spreads
Stresses
Turbulence
Turbulent flow
剪切应力
均值
波动
测量流量
湍流射流
相干结构
速度场
钻石
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Summary:The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice（hereafter termed a ＂diamond jet＂） with an aspect ratio of 1.7.Velocity measurements were conducted in the transitional region,and the exit Reynolds number of the jet was 50000.For comparison,a round jet with identical normalized boundary conditions was also measured.It is shown that the diamond jet decays and spreads faster than the round jet does over the measured flow region.The axis-switching phenomenon is observed in the diamond jet.Although both jets display primary coherent structures in the near field,these structures are found to break down more rapidly in the diamond jet,due to the higher three-dimensionality of the flow.Moreover,the streamwise components of the Reynolds normal stress and all the shear stresses reach their maxima around the location of the maximal mean shear while the maxima of the lateral components of the Reynolds normal stresses occur around the centreline of the jet.
Bibliography:Xu Min-Yi , Zhang Jian-Peng , Mi Jian-Chun , Nathan G. J., Kalt E A. M.（1） State Key Laboratory of Turbulence ＆ Complex Systems, College of Engineering, Peking University, Beijing 100871, China ;2） Marine Engineenng College, Dalian Maritime University, Dalian 116026, China ;3） Centre for Energy Technology and School of Mechanical Engineering, University of Adelaide, SA 5005, Australia
The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice（hereafter termed a ＂diamond jet＂） with an aspect ratio of 1.7.Velocity measurements were conducted in the transitional region,and the exit Reynolds number of the jet was 50000.For comparison,a round jet with identical normalized boundary conditions was also measured.It is shown that the diamond jet decays and spreads faster than the round jet does over the measured flow region.The axis-switching phenomenon is observed in the diamond jet.Although both jets display primary coherent structures in the near field,these structures are found to break down more rapidly in the diamond jet,due to the higher three-dimensionality of the flow.Moreover,the streamwise components of the Reynolds normal stress and all the shear stresses reach their maxima around the location of the maximal mean shear while the maxima of the lateral components of the Reynolds normal stresses occur around the centreline of the jet.
turbulent jet,non-circular jet,PIV measurement,jet entrainment
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/3/034701