Summary
Axisymmetric jets subjected to large amplitude pulsations and plane jets forced to flap about a mean direction have been investigated experimentally. Both types of forcing increase the jet entrainment in the initial region but while the pulsating jet relaxes into the same axymptotic regime as the unforced flow the expansion of the plane flapping jet is affected far downstream. This behaviour may be accounted for by the induced pressure gradient. The periodic motion is at first amplified and then decays in both cases. The turbulent intensity in the initial region grows more rapidly than in the corresponding unforced jets and overshoots the asymptotic level. Some properties of the periodicmotions are analysed and compared with predictions of stability calculations.
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References
Favre-Marinet M., Binder G., Structure des jets puisants, J. de Mécanique vol. 18, n° 2, 355–394, 1979.
Favre-Marinet M, Binder G., Te Veng Hac, Generation of Oscillating Jets, J. Fluids Eng., to appear.
Wygnansky I, Fiedler H., Some measurements in the self-preserving jet, J. Fluids Mech., vol. 38, 3, 577–612, 1969.
Hasan M.A.Z., Hussain, The self-excited axisymmetric jet, submitted to the J. Fluid Mech.,
Liu J.T.C., Mankbadi R., A study of the interactions between Large-scale coherent structures and finè-grained turbulence in a round jet, Phil. Tran. Roy. Soc., London, Serie A, to appear.
Crighton D.G., Gaster M., Stability of slowly diverging jet flow, J. Fluid Mech., vol. 77, 2, 397–413, 1976.
Hussain A.K.M.F., Ray Clark A., Upstream influence on the near field of turbulent jets, Physics Fluids, vol. 20, 9, 1416 1426, 1977
Kotsovinos N.E., A note on the conservation of axial momentum of a turbulent jet, J. Fluid Mech., vol. 87, 1, 55–63, 1978.
Soutif M., Diffusion et structure périodique des jets battants, Thèse de Doctorat de Spécialité, Université de Grenoble, 1977
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© 1981 Springer-Verlag, Berlin, Heidelberg
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Binder, G., Favre-Marinet, M. (1981). Some Characteristics of Pulsating or Flapping Jets. In: Michel, R., Cousteix, J., Houdeville, R. (eds) Unsteady Turbulent Shear Flows. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81732-8_31
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DOI: https://doi.org/10.1007/978-3-642-81732-8_31
Publisher Name: Springer, Berlin, Heidelberg
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