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The initial region of subsonic coaxial jets. Part 2

Published online by Cambridge University Press:  12 April 2006

A. S. H. Kwan  and
N. W. M. Ko
A. S. H. Kwan
Affiliation:
Department of Mechanical Engineering, University of Hong Kong
N. W. M. Ko
Affiliation:
Department of Mechanical Engineering, University of Hong Kong
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Abstract

Earlier investigations by the authors have suggested that coherent structures, in the form of two different arrays of vortices, exist in the initial region of coaxial jets. The present investigation was aimed at obtaining further information on the characteristics of the vortices in coaxial jets. Single- and two-point correlation covariance measurements of the fluctuating pressure and the axial and radial velocity fluctuations have been made in the initial region of coaxial jets. Detailed analysis of the correlograms indicates the combined effect of the two vortex trains on the correlograms. Further, the analysis enables the phase relationship between the pressure and axial and radial velocity fluctuations to be obtained. From the correlation results the phase properties obtained within the whole initial region of coaxial jets are found to agree with the results for single jets. This good agreement supports the formally suggested simple approach to the understanding of the complicated flow in coaxial jets.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 82 , Issue 2 , 7 September 1977 , pp. 273 - 287
Copyright
© 1977 Cambridge University Press

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References

Bradshaw, P., Ferriss, D. H. & Johnson, R. F. 1964 Turbulence in the noise-producing region of a circular jet. J. Fluid Mech. 19, 591–624.Google Scholar
Chan, Y. Y. 1974 Spatial wave in turbulent jets. Phys. Fluids 17, 46–53.Google Scholar
Crow, S. C. & Champagne, F. H. 1971 Orderly structure in jet turbulence. J. Fluid Mech. 48, 547–591.Google Scholar
Davies, P. O. A. L. & Davis, M. R. 1966 Hot-wire anemometer. I.S.A.V. Rep. no. 155.Google Scholar
Ko, N. W. M. 1974 On the correlation technique in the subsonic jet. Noise, Shock, Vibration Conf. Monash Univ., Melbourne, pp. 226–235.
Ko, N. W. M. & Davies, P. O. A. L. 1971 The near field within the potential core of subsonic cold jets. J. Fluid Mech. 50, 49–78.Google Scholar
Ko, N. W. M. & Davies, P. O. A. L. 1975 Some covariance measurements in a subsonic cold jet. J. Sound Vib. 41, 347–358.Google Scholar
Ko, N. W. M. & Kwan, A. S. H. 1974 Experimental investigation of subsonic coaxial jets. 5th Australasian Conf. Hydraul. Fluid Mech. pp. 609–616.
Ko, N. W. M. & Kwan, A. S. H. 1976 The initial region of subsonic coaxial jets. J. Fluid Mech. 73, 305–332.Google Scholar
Kwan, A. S. H. & Ko, N. W. M. 1976 Coherent structures in subsonic coaxial jets. J. Sound Vib. 48, 203–219.Google Scholar
Lau, J. C. 1971 The coherent structure of jets. Ph.D. thesis, University of Southampton.
Lau, J. C. & Fisher, M. J. 1975 The vortex-street structure of ‘turbulent’ jets. Part 1. J. Fluid Mech. 67, 299–337.Google Scholar
Lau, J. C., Fisher, M. J. & Fuchs, H. V. 1972 The intrinsic structure of turbulent jets. J. Sound Vib. 22, 379–406.Google Scholar
Laufer, J., Kaplan, R. E. & Chu, W. T. 1974 On the generation of jet noise. AGARD Conf. Proc. no. 131, paper 21.Google Scholar
Michalke, A. & Fuchs, H. V. 1975 On turbulence and noise of an axisymmetric shear flow. J. Fluid Mech. 70, 179–205.Google Scholar
Winant, C. D. & Browand, F. K. 1974 Vortex pairing: the mechanism of turbulent mixing layer growth at moderate Reynolds number. J. Fluid Mech. 63, 237–255.Google Scholar