中国物理B ›› 2013, Vol. 22 ›› Issue (3): 34701-034701.doi: 10.1088/1674-1056/22/3/034701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Mean and fluctuating velocity fields of a diamond turbulent jet

徐敏义a b, 张健鹏a, 米建春a, Nathan G. J.c, Kalt P. A. M.c   

  1. a State Key Laboratory of Turbulence & Complex Systems, College of Engineering, Peking University, Beijing 100871, China;
    b Marine Engineering College, Dalian Maritime University, Dalian 116026, China;
    c Centre for Energy Technology and School of Mechanical Engineering, University of Adelaide, SA 5005, Australia
  • 收稿日期:2012-06-26 修回日期:2012-08-07 出版日期:2013-02-01 发布日期:2013-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11072005 and 10921202).

Mean and fluctuating velocity fields of a diamond turbulent jet

Xu Min-Yi (徐敏义)a b, Zhang Jian-Peng (张健鹏)a, Mi Jian-Chun (米建春)a, Nathan G. J.c, Kalt P. A. M.c   

  1. a State Key Laboratory of Turbulence & Complex Systems, College of Engineering, Peking University, Beijing 100871, China;
    b Marine Engineering College, Dalian Maritime University, Dalian 116026, China;
    c Centre for Energy Technology and School of Mechanical Engineering, University of Adelaide, SA 5005, Australia
  • Received:2012-06-26 Revised:2012-08-07 Online:2013-02-01 Published:2013-02-01
  • Contact: Mi Jian-Chun E-mail:jcmi@coe.pku.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11072005 and 10921202).

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摘要： The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice (hereafter termed ''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.

关键词: turbulent jet, non-circular jet, PIV measurement, jet entrainment

Abstract: The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice (hereafter termed ''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.

Key words: turbulent jet, non-circular jet, PIV measurement, jet entrainment

中图分类号:  (Turbulent jets)

  • 47.27.wg
47.80.Cb (Velocity measurements) 47.85.lk (Mixing enhancement)