The Mixing Mechanism by Organised Turbulence Structures in a Plane Jet Excited by a Novel Method

  • M. A. Badri Narayanan
  • Max F. Platzer
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


A plane subsonic turbulent jet was subjected to controlled periodic oscillations of high amplitude at the nozzle exit. The oscillations produced considerable jet spreading and entrainment. Vortex dynamics played a significant role in this process and the amplification of the applied periodic disturbances was associated with a fairly well defined Strouhal number. Three distinct phases in the flow could be observed during excitation, namely, (a) flapping motion near the exit region, (b) formation of vortices at a critical Strouhal number and their amplification, and (c) breakdown of large vortices into smaller components with the flow becoming fully turbulent. The jet when operated with a simple straight duct-diffuser ejector system increased the thrust augmentation ratio by a factor of 1.20.


Nozzle Exit Strouhal Number Free Shear Layer Exit Region Entrainment Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Height of the nozzle at exit.


Width of the jet corresponding to Uo/2


Throw length, i.e., maximum movement of the reciprocating segments


Static pressure


Mean velocity in the X direction


Exit velocity


Center line velocity


Entrainment ratio


Reynolds number HUe/V


Strouhal number fb/Uo


Excitation frequency


Natural frequency of the steady jet


Thrust of the jet based on isentropic conditions

\({\mathop {\text{T}}\limits_{\text{e}} ^{\text{o}}} \)

Thrust of the ejector


Thrust augmentation ratio (To + Te)/To


Half angle of the diffuser


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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • M. A. Badri Narayanan
    • 1
  • Max F. Platzer
    • 1
  1. 1.Department of AeronauticsNaval Postgraduate SchoolMontereyUSA

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