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Chin. Phys. B, 2014, Vol. 23(4): 044704    DOI: 10.1088/1674-1056/23/4/044704
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Large eddy simulations of a circular orifice jet with and without a cross-sectional exit plate

Zhang Jian-Penga, Xu Min-Yib, Mi Jian-Chuna 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 College of Energy & Power Engineering, Changsha University of Science and Technology, Changsha 410004, China
Abstract  The effect of a cross-sectional exit plane on the downstream mixing characteristics of a circular turbulent jet is investigated using large eddy simulation (LES). The turbulent jet is issued from an orifice-type nozzle at an exit Reynolds number of 5× 104. Both instantaneous and statistical velocity fields of the jet are provided. Results show that the rates of the mean velocity decay and jet spread are both higher in the case with the exit plate than without it. The existence of the plate is found to increase the downstream entrainment rate by about 10% on average over the axial range of 8-30de (exit diameter). Also, the presence of the plate enables the formation of vortex rings to occur further downstream by 0.5-1.0de. A physical insight into the near-field jet is provided to explain the importance of the boundary conditions in the evolution of a turbulent jet. In addition, a method of using the decay of the centreline velocity and the half-width of the jet to calculate the entrainment rate is proposed.
Keywords:  circular orifice jet      large eddy simulation (LES)      exit plate      entrainment  
Received:  07 June 2013      Revised:  27 September 2013      Accepted manuscript online: 
PACS:  47.27.ep (Large-eddy simulations)  
  47.27.wg (Turbulent jets)  
  47.85.lk (Mixing enhancement)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11072005 and 10921202) and the Fundamental Research Funds for the Central Universities, China (Grant No. 3132013029).
Corresponding Authors:  Mi Jian-Chun     E-mail:  jcmi@coe.pku.edu.cn
About author:  47.27.ep; 47.27.wg; 47.85.lk

Cite this article: 

Zhang Jian-Peng, Xu Min-Yi, Mi Jian-Chun Large eddy simulations of a circular orifice jet with and without a cross-sectional exit plate 2014 Chin. Phys. B 23 044704

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