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An experimental study of round jets in cross-flow

Published online by Cambridge University Press:  26 April 2006

R. M. Kelso ,
T. T. Lim  and
A. E. Perry
R. M. Kelso
Affiliation:
Department of Mechanical and Manufacturing Engineering, The University of Melbourne, Parkville, Victoria, Australia, 3052 Current address: Department of Mechanical Engineering, The University of Adelaide, S. A., Australia, 5005.
T. T. Lim
Affiliation:
Department of Mechanical and Manufacturing Engineering, The University of Melbourne, Parkville, Victoria, Australia, 3052 Current address: Department of Mechanical and Production Engineering., National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511.
A. E. Perry
Affiliation:
Department of Mechanical and Manufacturing Engineering, The University of Melbourne, Parkville, Victoria, Australia, 3052
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Abstract

The structure of round jets in cross-flow was studied using flow visualization techniques and flying-hot-wire measurements. The study was restricted to jet to freestream velocity ratios ranging from 2.0 to 6.0 and Reynolds numbers based on the jet diameter and free-stream velocity in the range of 440 to 6200.

Flow visualization studies, together with time-averaged flying-hot-wire measurements in both vertical and horizontal sectional planes, have allowed the mean topological features of the jet in cross-flow to be identified using critical point theory. These features include the horseshoe (or necklace) vortex system originating just upstream of the jet, a separation region inside the pipe upstream of the pipe exit, the roll-up of the jet shear layer which initiates the counter-rotating vortex pair and the separation of the flat-wall boundary layer leading to the formation of the wake vortex system beneath the downstream side of the jet.

The topology of the vortex ring roll-up of the jet shear layer was studied in detail using phase-averaged flying-hot-wire measurements of the velocity field when the roll-up was forced. From these data it is possible to examine the evolution of the shear layer topology. These results are supported by the flow visualization studies which also aid in their interpretation.

The study also shows that, for velocity ratios ranging from 4.0 to 6.0, the unsteady upright vortices in the wake may form by different mechanisms, depending on the Reynolds number. It is found that at high Reynolds numbers, the upright vortex orientation in the wake may change intermittently from one configuration of vortex street to another. Three mechanisms are proposed to explain these observations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 306 , 10 January 1996 , pp. 111 - 144
Copyright
© 1996 Cambridge University Press

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References

Andreopoulos, J. 1982 Measurements in a jet-pipe flow issuing perpendicularly into a cross stream. Trans. ASME I: J. Fluids Engng 104, 493–499.Google Scholar
Andreopoulos, J. 1984 Initial conditions, Reynolds number effects and the near field characteristics of the round jet in a cross flow. J. Flight Sci. Space Res. 8 Heft 2.Google Scholar
Andreopoulos, J. 1985 On the structure of jets in crossflow. J. Fluid Mech. 157, 163–197.Google Scholar
Andreopoulos, J. & Rodi, W. 1984 Experimental investigation of jets in a cross flow. J. Fluid Mech. 138, 93–127.Google Scholar
Baker, C. J. 1980 The turbulent horseshoe vortex. J. Wind Engng Ind. Aero. 6, 9–23.Google Scholar
Bergeles, G., Gosman, A. D. & Launder, B. E. 1976 The near-field character of a jet discharged normal to a main stream. Trans. ASME C: J. Heat Transfer 98, 373–378.Google Scholar
Bradbury, L. J. S. & Wood, M. N. 1965 The static pressure distribution around a circular jet exhausting normally from a plane wall into an airstream. Conf. Proc. 822. British Aeronautical Research Council, London, UK.
Broadwell, J. E. & Breidenthal, R. E. 1984 Structure and mixing of a transverse jet in incompressible flow. J. Fluid Mech. 148, 405–412.Google Scholar
Cantwell, B. & Coles, D. 1983 An experimental study of entrainment and transport in the turbulent near wake of a circular cylinder. J. Fluid Mech. 136, 321–374.Google Scholar
Chassaing, P., George, J., Claria, A. & Sananes, F. 1974 Physical characteristics of subsonic jets in a cross stream. J. Fluid Mech. 62, 41–64.Google Scholar
Coelho, S. L. V. & Hunt, J. C. R. 1989 The dynamics of the near field of strong jets in crossflows. J. Fluid Mech. 200, 95–120.Google Scholar
Crabb, D., Durao, D. F. G. & Whitelaw, J. H. 1981 A round jet normal to a crossflow. Trans. ASME I: J. Fluids Engng 103, 142–153.Google Scholar
Doligalski, T. L., Smith, C. R. & Walker, J. D. A. 1994 Vortex interactions with walls. Ann. Rev. Fluid Mech. 26, 573–616.Google Scholar
Fearn, R. & Weston, R. P. 1974 Vorticity associated with a jet in a cross flow. AIAA J. 12, 1666–1671.Google Scholar
Foss, J. F. 1980 Interaction region phenomena for the jet in a cross-flow problem. Rep. SFB 80/E/161. University of Karlsruhe.
Fric, T. F. 1990 Structure in the near field of the transverse jet. PhD thesis, California Institute of Technology.
Fric, T. F. & Roshko, A. 1989 Structure in the near field of the transverse jet. Seventh Symposium on Turbulent Shear Flows, pp. 6.4.1–6.4.6.
Fric, T. F. & Roshko, A. 1994 Vortical structure in the wake of a transverse jet. J. Fluid Mech. 279, 1–47.Google Scholar
Goldstein, J. E. & Smits, A. J. 1994 Flow visualization of the three-dimensional, time-evolving structure of a turbulent boundary layer. Phys. Fluids 6, 577–587.Google Scholar
Gursul, I., Lusseyran, D. & Rockwell, D. 1990 On interpretation of flow visualization of unsteady shear flows. Exps. Fluids 9, 257–266.Google Scholar
Hornung H. & Perry A. E. 1984 Some aspects of three-dimensional separation, Part 1. Streamsurface bifurcations. Z. Flugwiss Weltraumforsch. 8, 77–87.Google Scholar
Kamotani, Y. & Greber, I. 1972 Experiments on a turbulent jet in a cross flow. AIAA J. 10, 1425–1429.Google Scholar
Kavsaoglu, M. S. & Schetz, J. A. 1989 Effects of swirl and high turbulence on a jet in a crossflow. J. Aircraft 26, 539–546.Google Scholar
Keffer, J. F. & Baines, W. D. 1963 The round turbulent jet in a cross-wind. J. Fluid Mech. 15, 481–496.Google Scholar
Kelso, R. M. 1991 a study of free shear flows near rigid boundaries. 1 thesis, University of melbourne.
Kelso, R. M., Delo, C. & Smits, A. J. 1993 Unsteady wake structures in transverse jets. AGARD-CP 534, Paper 4.
Kelso, R M., Lim, T. T. & Perry, A. E. 1989 A new flying hot-wire for flow topology studies. Proc. 10 AFMC, pp. 5.5–5.8.
Kelso, R M., Lim, T. T. & Perry, A. E. 1994 A novel flying hot-wire system. Exps. Fluids 16, 181–186.Google Scholar
Kelso, R. M. & Smits, A. J. 1995 Horseshoe vortex systems resulting from the interaction between a laminar boundary layer and a transverse jet. Phys. Fluids 7, 153–158.Google Scholar
Krothapalli, A., Lourenco, L. & Buchlin, J. M. 1990 Separated flow upstream of a jet in a crossflow. AIAA J. 28, 414–420.Google Scholar
Krothapalli, A. & Shih, C. 1993 Separated flow generated by a vectored jet in crossflow. AGARD-CP 534, Paper 5.
Kuzo, D. M. & Roshko, A. 1984 Observations on the wake region of the transverse jet. Bull. Am. Phys. Soc. 29, 1536.Google Scholar
Lighthill, M. J. 1963 In Laminar Boundary Layers (ed. L. Rosenhead). Oxford University Press.
Lim, T. T., Kelso, R. M. & Perry, A. E. 1992 A study of a round jet in cross-flow at different velocity ratios. Proc. 11th Australasian Fluid Mechanics Conf., Hobart, Australia, pp. 1089–1092.
McMahon, H. M., Hester, D. D. & Palfrey, J. G. 1971 Vortex shedding from a turbulent jet in a cross-wind. J. Fluid Mech. 48, 73–80.Google Scholar
McMahon, H. M. & Mosher, D. K. 1969 Experimental investigation of pressures induced on a flat plate by a jet issuing into a subsonic crosswind. Analysis of a jet in a subsonic crosswind. NASA SP 218, pp. 49–62.Google Scholar
Morton, B. R. 1984 The generation and decay of vorticity. Geophys. Astrophys. Fluid Dyn. 28, 277–293.Google Scholar
Morton, B. R. & Ibbetson, A. 1994 Jets deflected in a crossflow. Proc. Intl Colloquium on Jets, Wakes and Shear Layers, CSIRO DBCE, Melbourne, Australia, April 18–20.
Moussa, Z. M., Trischka, J. W. & Eskinazi, S. 1977 The near field in the mixing of a round jet with a cross-stream. J. Fluid Mech. 80, 49–80.Google Scholar
Patankar, S. V., Basu, D. K. & Alpay, S. A. 1977 Prediction of the three- dimensional velocity field of a deflected turbulent jet. Trans. ASME I: J. Fluids Engng 99, 758–762.Google Scholar
Perry, A. E. & Chong, M. S. 1987 A description of eddying motions and flow patterns using critical-point concepts. Ann. Rev. Fluid Mech. 19, 125–155.Google Scholar
Perry, A. E. & Fairlie, B. D. 1974 Critical points in flow patterns. Adv. Geophys. B 18, 299–315.Google Scholar
Perry, A. E. & Lim, T. T. 1978 Coherent structures in coflowing jets and wakes. J. Fluid Mech. 88, 451–463.Google Scholar
Perry, A. E., Lim, T. T. & Chong, M. S. 1980 The instantaneous velocity fields of coflowing jets and wakes. J. Fluid Mech. 101, 243–256.Google Scholar
Perry, A. E. & Steiner, T. R. 1987 Large-scale vortex structures in turbulent wakes behind bluff bodies. Part 1. Vortex formation processes. J. Fluid Mech. 174, 233–270.Google Scholar
Perry, A. E. & Tan, D. K. 1984 Simple three-dimensional vortex motions in coflowing jets and wakes. J. Fluid Mech. 141, 197–231.Google Scholar
Pratte, B. D. & Baines, M. 1967 Profiles of the round turbulent jet in a crossflow. J. Hydronaut. Div. ASCE 92, 53–64.Google Scholar
Rajarantnam, N. & Gangadharaiah, T. 1983 Vortex structure of circular jets in crossflow. J. Wind Engng Indust. Aero. 12, 155–164.Google Scholar
Scorer, R. S. 1958 Natural Aerodynamics. Pergamon Press.
Shang, J. S., McMaster, D. L., Scaggs, N. & Buck, M. 1989 Interaction of jet in hypersonic cross stream. AIAA J. 27, 323–329.Google Scholar
Steiner, T. R. & Perry, A. E. 1987 Large-scale vortex structures in turbulent wakes behind bluff bodies. Part 2. Far-wake structures. J. Fluid Mech. 174, 271–298.Google Scholar
Sucec, J. & Bowley, W. W. 1976 Prediction of the trajectory of a turbulent jet injected into a crossflowing stream. Trans. ASME I: J. Fluids Engng 98, 667–673.Google Scholar
Sykes, R. I., Lewellen, W. S. & Parker, S. F. 1986 On the vorticity dynamics of a turbulent jet in a crossflow. J. Fluid Mech. 80, 49–80.Google Scholar
Wu, J. W., Vakili, A. D. & Yu, F. M. 1988 Investigation of the interacting flow of nonsymmetric jets in crossflow. AIAA J. 26, 940–947.Google Scholar