Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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NUMERICAL INVESTIGATION OF TURBULENT FLOW FROM AN ANNULAR JET

환형제트 난류유동에 대한 수치해석 연구

  • Kim, Jungwoo (Mechanical System Design Engineering, Seoul National University of Science and Technology)
  • 김정우 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2013.10.24
  • Accepted : 2013.12.26
  • Published : 2013.12.31
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Abstract

In the present study, the turbulent flow from an annular jet is investigated by using large eddy simulation. Particularly, the effect of the ratio of the inner and outer diameters is one of the main interests of this study. The instantaneous fields presented in this paper showed that behind the jet exit the backflow region, as well known in literatures, exists, and its detailed behavior depends on the ratio of the inner and outer diameters ($D_1/D_2$). The dependence on $D_1/D_2$ is attributed to the different shear layer development according to $D_1/D_2$. At small $D_1/D_2$, the development of the outer shear layer is similar to that from the circular jet. However, with increasing $D_1/D_2$, the interaction between the outer and inner shear layers becomes strong, resulting in fast transition to turbulence.

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References

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