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Analysis of the flow characteristics of the high-pressure supercritical carbon dioxide jet

  • Man Huang (黄满)
  • Yong Kang (康勇)Email author
  • Xiaochuan Wang (王晓川)
  • Yi Hu (胡毅)
  • Can Cai (蔡灿)
Article
  • 6 Downloads

Abstract

Supercritical carbon dioxide (SC-CO2) jet has wide application prospects for rock breaking and jet fracturing in the development of unconventional shale energy, due to the special physicochemical properties of SC-CO2. To investigate the jet flow characteristics, experimentations using high-speed photography and simulations through a compressible numerical model had been carried out. The results show that the jet flow field can be divided into three typical regions, the mixing layer possesses the same characteristics as a gas/gas turbulent mixing layer, and the divergent angles are evidently smaller than that of the incompressible jets. The predicted results by the numerical model had a good agreement with that of the experimentations. Through dimensionless analysis, the potential core shows a length about 9d and an increasing trend with the increase of the inlet pressure while the decay rate shows a decreasing trend, and the radial profiles collapse well with the “Ue-η*” normalized method. In addition, an obvious temperature drop of the SC-CO2 was observed between the nozzle inlet and the exit. A simple and convenient semi-empirical equation for calculating this temperature variation was deduced. Finally, the flow characteristics suggest that the SC-CO2 jet should be treated as a compressible jet.

Key words

Supercritical carbon dioxide jet flow characteristics experiment and simulation unconventional shale energy 

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Copyright information

© China Ship Scientific Research Center 2018

Authors and Affiliations

  • Man Huang (黄满)
    • 1
    • 2
  • Yong Kang (康勇)
    • 1
    • 2
    Email author
  • Xiaochuan Wang (王晓川)
    • 1
    • 2
  • Yi Hu (胡毅)
    • 1
    • 2
  • Can Cai (蔡灿)
    • 1
    • 2
  1. 1.School of Power and Mechanical EngineeringWuhan UniversityWuhanChina
  2. 2.Hubei Key Laboratory of Water Jet Theory and New TechnologyWuhan UniversityWuhanChina

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