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The self-excited axisymmetric jet

Published online by Cambridge University Press:  20 April 2006

M. A. Z. Hasan  and
A. K. M. F. Hussain
M. A. Z. Hasan
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas 77004
A. K. M. F. Hussain
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas 77004
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Abstract

The characteristics of a self-excited axisymmetric air jet driven by a whistler (i.e. pipe-collar) nozzle have been explored experimentally for various choices of the controlling parameters: namely, pipe length, jet diameter, collar length, step height, and jet speed. By appropriate choices of these parameters as well as the stage and mode (half- and full-wave), the self-sustained excitation has been induced at specific values of the excitation amplitude and the Reynolds number RD. The jet characteristics up to RD ≃ 3·1 × 105 and x/D ≃ 60 have been documented for both laminar and turbulent flows at the pipe exit. Comparison with corresponding unexcited-jet data reveals that self-excitation produces a large increase in the fluctuation intensity in the near field of the jet, while it increases the jet spread and decay rate for the entire x-range of measurement. The dependence of the jet structure on the initial condition is stronger when self-excited than when unexcited. The first stage of excitation always produces the highest turbulence augmentation and the spectral evolution is significantly modified by self-excitation up to x/D ≃ 6. The excitation produces a significant increase in the broad-band turbulence level over that of the unexcited jet. The broad-band amplification is maximized at x/D ≃ 4 and is the highest at the largest RD studied.

These data suggest interesting possibilities for the self-excited jet in the augmentation or control of entrainment, mixing and aerodynamic noise production.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 115 , February 1982 , pp. 59 - 89
Copyright
© 1982 Cambridge University Press

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References

Acton, E. 1980 J. Fluid Mech. 98, 1.
Antonia, R. A., Satyaprakash, B. R. & Hussain, A. K. M. F. 1980 Phys. Fluids 23, 695.
Batt, R. G. 1978 J. Fluid Mech. 82, 53.
Bechert, D. & Pfizenmaier, E. 1975 J. Sound Vib. 43, 581.
Bradshaw, P. 1977 J. Fluid Mech. 80, 795.
Browand, F. K. & Laufer, J. 1975 Turb. Liquids 5, 333.
Brown, G. L. & Roshko, A. 1974 J. Fluid Mech. 64, 775.
Bruun, H. H. 1977 J. Fluid Mech. 64, 775.
Cantwell, B., Coles, D. & Dimotakis, P. E. 1978 J. Fluid Mech. 87, 641.
Chandrsuda, C., Mehta, R. D., Weir, A. D. & Bradshaw, P. 1978 J. Fluid Mech. 85, 693.
Chan, Y. Y. 1974 Phys. Fluids 17, 46.
Chevray, R. & Tutu, N. K. 1978 J. Fluid Mech. 88, 133.
Clark, A. R. 1979 Ph.D. dissertation, University of Houston.
Coles, D. 1962 Rand Corporation Rep. no. R-403-PR.
Corrsin, S. & Uberoi, M. S. 1950 N.A.C.A. Rep. 988.
Crighton, D. G. 1972 J. Fluid Mech. 77, 397.
Crighton, D. G. 1981 Lecture Notes in Physics (ed. J. Jimenez), vol. 136, p. 340. Springer.
Crow, S. C. & Champagne, F. H. 1971 J. Fluid Mech. 48, 547.
Davies, P. O. A. L. & Yule, A. J. 1975 J. Fluid Mech. 69, 513.
Ffowcs Williams, J. E. & Kempton, A. J. 1978 J. Fluid Mech. 84, 673.
Freymuth, P. 1966 J. Fluid Mech. 25, 683.
Hasan, M. A. Z. 1978 M.S. thesis, University of Houston.
Hasan, M. A. Z. & Hussain, A. K. M. F. 1979 J. Acoust. Soc. Am. 65, 1140.
Hill, B. J. 1972 J. Fluid Mech. 51, 773.
Hill, W. G. & Greene, P. R. 1977 Trans. A.S.M.E. I, J. Fluids Engng 99, 520.
Hinze, J. O. 1975 Turbulence, 2nd edn. McGraw-Hill.
Hinze, J. O. & Van der Hegge Zijnen, B. G. 1949 Appl. Sci. Res. 1A, 435.
Husain, Z. D. & Hussain, A. K. M. F. 1979 A.I.A.A. J. 12, 48.
Hussain, A. K. M. F. 1981 Lecture Notes in Physics (ed. J. Jimenez), vol. 136, p. 252. Springer.
Hussain, A. K. M. F. & Reynolds, W. C. 1970 J. Fluid Mech. 41, 241.
Hussain, A. K. M. F. & Thompson, C. A. 1980 J. Fluid Mech. 100, 397.
Hussain, A. K. M. F. & Zaman, K. B. M. Q. 1975 In Proc. 3rd Interagency Symp. Transp. Noise, University of Utah, p. 314.
Hussain, A. K. M. F. & Zaman, K. B. M. Q. 1980 J. Fluid Mech. 101, 493.
Hussain, A. K. M. F. & Zaman, K. B. M. Q. 1981 J. Fluid Mech. 110, 39.
Hussain, A. K. M. F. & Zedan, M. F. 1978 Phys. Fluids 21, 1100.
Juvé, D., Sunyach, M. & Comte-Bellot, G. 1980 J. Sound Vib. 71, 319.
Khalifa, M. A. & Hussain, A. K. M. F. 1979 Bull. Am. Phys. Soc. 24, 1128.
Kibens, V. 1980 A.I.A.A. J. 18, 434.
Kotsovinos, N. E. 1976 J. Fluid Mech. 77, 305.
Miksad, R. W. 1972 J. Fluid Mech. 56, 695.
Moore, C. J. 1977 J. Fluid Mech. 80, 321.
Perry, A. E. & Morrison, G. L. 1971 J. Fluid Mech. 47, 765.
Petersen, R. A., Kaplan, R. E. & Laufer, J. 1974 N.A.S.A. CR-134733.
Pfizenmaier, E. 1973 Doktor-Ingenieur-Thesis, Technische Universität Berlin.
Pui, N. K. & Gartshore, I. S. 1979 J. Fluid Mech. 91, 111.
Ricou, F. P. & Spalding, D. B. 1961 J. Fluid Mech. 11, 21.
Schmidt, C. 1978 J. Sound Vib. 61, 148.
Schubauer, G. B. & Skramstad, H. K. 1947 J. Aero. Sci. 14, 69.
Sokolov, M., Hussain, A. K. M. F., Kleis, S. J. & Husain, Z. D. 1980 J. Fluid Mech. 98, 97.
Tennekes, H. & Lumley, J. L. 1974 A First Course in Turbulence. MIT Press.
Tso, J., Kovasznay, L. S. G. & Hussain, A. K. M. F. 1980 A.I.A.A. Paper no. 80-1355.
Winant, C. D. & Browand, F. K. 1974 J. Fluid Mech. 63, 237.
Wygnanski, I. & Fiedler, H. 1969 J. Fluid Mech. 38, 577.
Yule, A. J. 1978 J. Fluid Mech. 89, 413.
Zaman, K. B. M. Q. 1978 Ph.D. dissertation, University of Houston.
Zaman, K. B. M. Q. & Hussain, A. K. M. F. 1980 J. Fluid Mech. 101, 449.
Zaman, K. B. M. Q. & Hussain, A. K. M. F. 1981 J. Fluid Mech. 103, 133.
Zilberman, M., Wygnanski, I. & Kaplan, R. E. 1977 Phys. Fluids Suppl. 20, S258.