Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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PIV Measurements of Flow and Turbulence Characteristics of Round Jet in Crossflow

횡단류 제트의 유동 및 난류특성치에 대한 PIV 측정

  • 김경천 (부산대학교 기계공학부, 기계기술연구소 열 및 물질전달 연구실) ;
  • 김상기 (부산대학교 대학원 기계공학과) ;
  • 윤상열 (부산대학교 대학원 기계공학과)
  • Published : 2000.03.01
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Abstract

The instantaneous and ensemble averaged flow characteristics of a round jet issuing normally into a crossflow was studied using a flow visualization technique and Particle Image Velocimetry measurements. Experiments were performed at a jet-to-crossflow velocity ratio, 3.3, and two Reynolds numbers, 1050 and 2100, based on crossflow velocity and jet diameter. Instantaneous laser tomographic images of the vertical center plane of the crossflow jet showed that there exist very different natures in the flow structures of the near field jet even though the velocity ratio is the same. It was found that the shear layer becomes much thicker when the Reynolds number is 2100 due to the strong entrainment of the inviscid fluid by turbulent interaction between the jet and crossflow. The mean and second order statistics were calculated by ensemble averaging over 1000 realizations of instantaneous velocity fields. The detail characteristics of mean flow field, stream wise and vertical r.m.s. velocity fluctuations, and Reynolds shear stress distributions were presented. The new PlV results were compared with those from previous experimental and LES studies.

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References

  1. Margason, R. J., 1993, 'Fifty Years of Jet in Crosflow Research,' In Computational and Experimental Assessment of Jets in Cross Flow, AGARDCP-534, Winchester, UK
  2. Pratte, B. P. and Baines, W. D., 1967, 'Profiles of the Round Turbulent Jet in a Crossflow,' Journal of the Hydraulics Division, Proc. of the ASCE, HY(6), pp. 56-63
  3. Crabb, D., Durao, D. F. G. and Whitelaw, J. R., 1981, 'A Round Jet Normal to a Crossflow,' J. Fluids Engineering, Vol. 103, pp. 142-153
  4. Andreopoulos, J. and Rodi, W., 1984, 'On the Structure of Jets in Crossflow,' J. Fluid Mech., Vol. 157, pp. 163-197 https://doi.org/10.1017/S0022112085002348
  5. Fric, T. F. and Roshko, A., 1994, 'Vortical Structure in the Wake of a Transverse Jet,' J. Fluid Mech., Vol. 279, pp. 1-147 https://doi.org/10.1017/S0022112094003800
  6. Kelso, R. M., Lim, T. T. and Perry, A. E., 1996, 'An Experimental Study of Round Jets in Cross-Flow,' J. Fluid Mech., Vol. 306, pp. 111-144 https://doi.org/10.1017/S0022112096001255
  7. 김경천, 신대식, 이부환, 1998, '분지관 혼합기의 난류혼합에 대한 유동가시화 연구 (I),' 대한 기계학회논문집, B권, 제22권, 제1호, pp. 25 -33
  8. 김경천, 신대식, 1998, '분지관 혼합기의 난류 혼합에 대한 유동가시화 연구(II),' 대한기계학회논문집 B권, 제22권 제7호, pp. 1013-1021
  9. 김경천, 신대식, 박기영, 1998, '분지관 혼합기의 난류혼합에 대한 유동가시화 연구(III), 대한기계학회논문집 B권, 제22권, 제11호, pp. 1571-1581
  10. Claus, R. W. and Vanka, S. P., 1992, 'Multigrid Calculations of a Jet in Crossflow,' J. Propulsion and Power, Vol. 8(2), pp. 425-431
  11. Yuan, L. L., Street, R. L. and Ferziger, J. H., 1999, 'Large Eddy Simulations of a Round Jet in Crossflow,' J. Fluid Mech., Vol. 379, pp. 71-104 https://doi.org/10.1017/S0022112098003346
  12. Sherif, S. A. and Pletcher, R. R., 1989, 'Measurements of the Flow and Turbulence Characteristics of Round Jets in Crossflow,' J. Fluids Engineering, Vol. 111, pp. 165-171