The role of irreversibility in vectoring thrust using counterflow control

D. J. Forliti, P. J. Strykowski, R. D. Gillgrist

Research output: Contribution to conferencePaperpeer-review


A Mach 0.5 rectangular jet was vectored using counterflow control and examined using PIV. Vectoring up to 14 ° is produced through the development of a low-pressure region on one side of the jet, which is allowed to act on an extended surface. It is shown that the applied suction simultaneously lowers the static pressure along the collar and develops a secondary reverse flow. The secondary flow gives rise to intense turbulence and rapid shear layer diffusion. The concomitant turbulent shear stress gradients lead to considerable pressure drop due to irreversible mechanisms. The irreversibility is advantageous in that the required pressure field can be developed at a considerable reduction in secondary mass flow, when compared to comparable pressure changes brought about by reversible flow acceleration.

Original languageEnglish (US)
StatePublished - Jan 1 2002
Event1st Flow Control Conference 2002 - St. Louis, MO, United States
Duration: Jun 24 2002Jun 26 2002


Other1st Flow Control Conference 2002
CountryUnited States
CitySt. Louis, MO

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