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

The Korean Society of Mechanical Engineers (대한기계학회)
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Experiments on the Flow Characteristics of Circular Multiple Jets Arrayed Circumferentially

원주상으로 배열된 다중 원형 제트의 유동 특성

  • 진학수 (순천대학교 대학원 기계공학과) ;
  • 김정수 (순천대학교 기계우주항공공학부) ;
  • 최종욱 (순천대학교 기계우주항공공학부) ;
  • 김성초 (순천대학교 기계우주항공공학부)
  • Published : 2007.03.01
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Abstract

This paper describes the flow characteristics of circular multiple jet investigated by hot-wire anemometry. The nozzle arrays were classified into two cases; 6- or 7-nozzle located circumferentially in equal interval without or with a central jet. The flow field was measured according to the number of nozzles when the Reynolds number based on the nozzle exit is about $10^4$. Mean velocity, Reynolds shear stress and turbulent kinetic energy were investigated in the downstream of jets. The Tollmien's theory holds for downstream only when a nozzle locates at the center. Jet interaction is influenced due to with or without a center nozzle. In addition, the two-dimensional numerical computation was conducted for 3-nozzle case to obtain the general flow structure near the nozzle exit, which verifies the formation of the recirculation region with captive vortices, that is, the evidence of the interaction between jets.

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References

  1. Rajaratnam. N., 1976, Turbulent Jets, Elsevier Scientific Publishing Company, Amsterdam, pp. 27-49
  2. Wygnanski, I. and Fielder, H., 1969, 'Some Measurements in the Self-preserving Jet,' J. Fluid Mech., Vol. 38, pp. 577-612 https://doi.org/10.1017/S0022112069000358
  3. Kim, S. K., Cho, J. R. and Chung, M. K, 1990, 'An Experimental Study about the Intermittent Flow Field in the Transsition Region of a Turbulent Round Jet,' Trans. of the KSME, Vol. 14, No. 1, pp. 230-240
  4. Lee, T. S. and Choi, O. S., 1985, 'Large-Scale Structure of Circular Jet in Transitional Region at Reynolds Number of $10^4$,' Trans. of the KSME, Vol. 10, No. 6, pp. 823-829
  5. Rew, H. S. and Park, S. O., 1990, 'Turbulence Characteristics of a Merged Jet from Two Opposing Curved Wall Jets,' KSAS Journal, Vol. 19, No. 3, pp. 3022-3031
  6. Rew, H. S. and Park, S. O., 1996, 'The Triple-Moment Transport of the Merged Jet Arising From Two Opposing Curved Wall Jets,' KSAS Journal, Vol. 24, No. 1, pp. 1010-1017
  7. Gilbert, B. I., 1988, 'Turbulent Measurements in a Two-dimensional Upwash,' AIAA Journal, Vol. 26, pp. 10-14 https://doi.org/10.2514/3.9844
  8. Kim, D. K. and Yoon, S. H., 2005, 'Experimental Investigation of Two Parallel Plane Jets,' Trans. of the KSME B, Vol. 29, No. 2, pp. 214-223
  9. Yoon, S. J., 1998, 'A Study on the Flow Characteristics in the Mixing Region of Parallel Round Jets,' KSAS Journal, Vol. 26, No. 8, pp. 31-69
  10. Capp, S. P., 1983, 'Experimental Investigation of the Turbulent Axisymmetric Jet,' Ph. D, thesis, Univ. at Buffalo, SUNY
  11. Hussein, J. H., Steven, P. C. and William, K. G., 1994, 'Velocity Measurements in a High Reynolds Number, Momentum Conserving Axisymmetric Turbulent Jet,' J. Fluid Mech., Vol. 258, pp. 31-75 https://doi.org/10.1017/S002211209400323X
  12. Lee, S. and Lee, B. J., 2001, 'Characteristics of Interacting Lifted Flames,' Trans. of the KSME B, Vol. 25, No. 4, pp. 461-466
  13. Ribeiro, M. M. and Whitelaw, J. H., 1975, 'Statistical Characteristics of a Turbulent Jet,' J. Fluid Mech., Vol. 70, part. 1, pp. 1-15 https://doi.org/10.1017/S0022112075001863
  14. Antonia, R. A. and Bilger, R. W., 1973, 'An Experimental Investigation of an Axisymmetric Jet in a Co-flowing Air Stream,' J. Fluid Mech., Vol. 61, part. 4, pp. 805-822 https://doi.org/10.1017/S0022112073000959
  15. Okamoto, T. and Yagita, M., 1985, 'Interaction of Twin Turbulent Circular Jet,' Bulletine of JSME, Vol. 28, No. 238, pp. 617-622 https://doi.org/10.1299/jsme1958.28.617
  16. Tanaka, E., 1974, 'The Interference of Two-Dimensional Parallel Jets,' Bulletine of JSME, Vol. 17, No. 109, pp. 920-927 https://doi.org/10.1299/jsme1958.17.920
  17. Comsol, Multiphysics, User's Guide, Ver 3.3, Comsol AB, 2006