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Annular Jets of Different Diameter Ratios

Published online by Cambridge University Press:  07 June 2016

N.W.M. Ko and
F.C. Chu
N.W.M. Ko
Affiliation:
Department of Mechanical Engineering, University of Hong Kong
F.C. Chu
Affiliation:
Department of Mechanical Engineering, University of Hong Kong
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Summary

This paper describes part of a detailed study of annular jets of different diameter ratios. From the overall pressure and spectral measurements of conical and basic annular jets of five diameter ratios the coherent structures of the standing vortices, wake vortices, jet vortices, lower wake induced vortices and wake induced vortices can be isolated and their effects assessed. The findings are supported by the available multi-exposed schlieren photographs of both the conical and basic annular jets. The causes for the presence or absence of the additional trains of vortices in the jet flow can also be evaluated by the variation of the diameter ratio. For the standing vortices and wake vortices within the flow behind the interface good correlation is found with the available pressure behind the interface.

Information

Type
Research Article
Information
Aeronautical Quarterly , Volume 34 , Issue 3 , August 1983, pp. 163 - 196
Copyright
Copyright © Royal Aeronautical Society. 1983

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References

1 Ko, N.W.M. and Chan, W.T. Similarity in the initial region of annular jets; three configurations. Journal of Fluid Mechanics, Vol. 84, pp 641-656, 1978 Google Scholar
2 Chan, W.T. and Ko, N.W.M. Coherent structures in the outer mixing region of annular jet. Journal of Fluid Mechanics, Vol. 89, pp 515-533, 1978 Google Scholar
3 Ko, N.W.M. and Chan, W.T. The inner regions of annular jets. Journal of Fluid Meahanios, Vol. 93, pp 549-584, 1979 Google Scholar
4 Chigier, N.A. and Beer, J.M. The flow region near the nozzle in double concentric jet. Transaations of the American Society of Meohanie Engineers, Journal of Basic Engineering, Vol. 86, pp 797-804, 1964 Google Scholar
5 Beer, J.M. and Chigier, N.A. Combustion Aerodynamics. London: Applied Science Publishers Ltd., 1972 Google Scholar
6 Crow, S.C. and Champagne, F.H. Orderly structure in jet turbulence. Journal of Fluid Meahanics, Vol. 48, pp 547-591, 1971 Google Scholar
7 Ko, N.W.M. Annular jets of small inner diameter. Journal of Sound and Vibration, Vol. 68, pp 468-472, 1980 Google Scholar
8 Ko, N.W.M. Annular jets of large inner diameter. Journal of Sound and Vibration, Vol. 69, pp 616-621, 1980 Google Scholar
9 Fuchs, H.V. Measurement of pressure fluctuations within subsonic turbulent jets. Journal of Sound and Vibration, Vol. 22, pp 361-378, 1972 Google Scholar
10 Ko, N.W.M. and Kwan, A.S.H. The initial region of subsonic coaxial jets. Journal of Fluid Meahanios, Vol. 73, pp 305-332, 1976 Google Scholar
11 Moore, C.J. The role of shear-layer instability waves in jet exhaust noise. Journal of Fluid Meahanios, Vol. 80, pp 321-367, 1977 Google Scholar
12 Lau, J.C., Fisher, M.J. and Fuchs, H.V. The intrinsic structure of turbulent jets. Journal of Sound and Vibration, Vol. 22, pp 379-406, 1972 Google Scholar
13 Ko, N.W.M. and Davies, P.O.A.L. Some covariance measurements in a subsonic jet. Journal of Sound and Vibration, Vol. 41, pp 347-358, 1975 Google Scholar
14 Ko, N.W.M. and Davies, P.O.A.L. The near field within the potential core of subsonic cold jets. Journal of Fluid Meahanios, Vol. 50, pp 49-78, 1971 Google Scholar
15 Chan, Y.Y. Spatial waves in turbulent jets. The Physios of Fluids, Vol. 17, pp 46-53, 1974 Google Scholar
16 Ko, N.W.M. and Leung, C.K. Covariance measurements in the initial region of an annular jet. Journal of Sound and Vibration, Vol. 80, pp 339-354, 1982 Google Scholar