한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
권호 표지

동축제트의 와류주파수 및 혼합특성에 대한 수치해석

NUMERICAL STUDY ON THE CHARACTERISTICS OF VORTEX FREQUENCY AND LAMINAR MIXING OF A PASSIVE SCALAR IN COAXIAL JET FLOWS

  • 김원현 (경북대학교 대학원 기계공학부) ;
  • 박태선 (경북대학교 기계공학부)
  • 발행 : 2009.09.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This study focuses on the near-field vortical structure and dynamics of coaxial jets. The characteristics of laminar flow and mixing in coaxial jets are investigated using a unsteady flow simulation. In order to analyze the geometric effects on the vortical structure, several cases of different configurations are selected for various values of the velocity ratio of inner jet to outer jet. From the result, it is confirmed that the flow mixing is promoted by the development of vortical structure and the interaction between inner jet and outer jet. This feature is strongly related to the vortex frequency in the shear-layers. The vortex frequency depends on the velocity ratio and the lip thickness of inner nozzle, but the outer pipe length has no effect on the frequency variation.

키워드

참고문헌

  1. 1976, Ko, N.W.M. and Kwan, A.S.H., "The initial region of subsonic coaxial jets," J. Fluid. Mech., Vol.73, pp.305-332 https://doi.org/10.1017/S0022112076001389
  2. 1977, Ko, N.W.M. and Kwan, A.S.H., "The initial region of subsonic coaxial jets. Part 2," J. Fluid. Mech., Vol.82, pp.273-287 https://doi.org/10.1017/S0022112077000664
  3. 1979, Ko, N.W.M. and Chan, W.T., "The inner region of annular jets," J. Fluid. Mech., Vol.93, pp.549-584 https://doi.org/10.1017/S0022112079002652
  4. 1978, Ko, N.W.M. and Chan, W.T., "Similarity in the initial region of annular jets: three configuration," J. Fluid. Mech.,Vol.84, pp.641-656 https://doi.org/10.1017/S0022112078000397
  5. 1980, Ribeiro, M.M. and Whitelaw, J.H., "Coaxial jets with and without swirl," J. Fluid. Mech., Vol.96, pp.769-795 https://doi.org/10.1017/S0022112080002352
  6. 1981, Ko, N.W.M. and Au, H., "Initial region of subsonic coaxial jets of mean-velocity ratio," Transactions of the American Society of Mechanical Engineer, J. Fluid. Engineering, Vol.103, pp.335-338
  7. 1981, Ko, N.W.M. and Au, H., "Spreading rate and reattachment of coaxial jet of high mean-velocity ratio," Transactions of the American Society of Mechanical Engineer, J. Fluid. Engineering, Vol.104, pp.400-401
  8. 1983, Ko, N.W.M. and Au, H., "Pressure measurement of coaxial jet of high mean-velocity ratio," Transactions of the American Scoiety of Mechanical Engineer, Vol.7, pp.51-57
  9. 1997, Kiwata, T., Okijima, A., Ueno, H. and Kimura, S.,"Vortex Frequency of Coaxial Jets," JSME Int. Conf. on Fluids Eng.(Tokyo), Vol.1, pp.111-116
  10. 1992, Lele, S.K., "Compact finite difference schemes with spectral-like resolution," J. Computational Phys., Vol.103, pp.16-42 https://doi.org/10.1016/0021-9991(92)90324-R
  11. 1992, Zhu, J., "Higher-order bounded discretization schemes for finite volume computations of incompressible flows," Comput. Meth. Appl. Mech. Eng., Vol.98, pp.345-360 https://doi.org/10.1016/0045-7825(92)90003-3
  12. 1985, Issa, R.I., "Solution of the implicitly discretised fluid flow equations by operator-splitting," J. Computational Physics, Vol.62, pp.40-65 https://doi.org/10.1016/0021-9991(86)90099-9
  13. 2006, Park, T.S., "Effects of time-integration method in a large-eddy simulation using the PISO algorithm," Numerical Heat Transfer, Part A, Vol.50, pp.229-245 https://doi.org/10.1080/10407780600602374
  14. 2004, Wegner, B., Huai, Y. and Sadiki, A., "Comparative study of turbulent mixing in jet in cross-flow configuration using LES," Int. J. Heat and Fluid Flow, Vol.25, pp.767-775 https://doi.org/10.1016/j.ijheatfluidflow.2004.05.015