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Chin. Phys. B, 2013, Vol. 22(3): 034701    DOI: 10.1088/1674-1056/22/3/034701
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Mean and fluctuating velocity fields of a diamond turbulent jet

Xu Min-Yia b, Zhang Jian-Penga, Mi Jian-Chuna, Nathan G. J.c, Kalt P. A. M.c
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
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.
Keywords:  turbulent jet      non-circular jet      PIV measurement      jet entrainment  
Received:  26 June 2012      Revised:  07 August 2012      Published:  01 February 2013
PACS:  47.27.wg (Turbulent jets)  
  47.80.Cb (Velocity measurements)  
  47.85.lk (Mixing enhancement)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11072005 and 10921202).
Corresponding Authors:  Mi Jian-Chun     E-mail:  jcmi@coe.pku.edu.cn

Cite this article: 

Xu Min-Yi, Zhang Jian-Peng, Mi Jian-Chun, Nathan G. J., Kalt P. A. M. Mean and fluctuating velocity fields of a diamond turbulent jet 2013 Chin. Phys. B 22 034701

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