Control of flow separation by vestigial "synthetic jet"

0434210 - ÚT 2015 RIV CZ eng C - Conference Paper (international conference)
Tesař, Václav - Pavelka, Miroslav - Smyk, E. - Peszyński, K.
Control of flow separation by vestigial "synthetic jet".
Colloquium FLUID DYNAMICS 2014. Praha: Ústav termomechaniky AV ČR, v. v. i., 2014 - (Jonáš, P.; Uruba, V.), s. 29-30. ISBN 978-80-87012-53-6.
[Colloquium FLUID DYNAMICS 2014. Praha (CZ), 22.10.2014-24.10.2014]
R&D Projects: GA ČR GA13-23046S
Institutional support: RVO:61388998
Keywords : synthetic jet * separation control * fluidics
Subject RIV: BK - Fluid Dynamics

A useful aerodynamic control action may be causing a separation of flow from the wall past which the fluid flows. Several current research activities aim at doing so by oscillating zero-time-mean flow generated in a nozzle located in the wall. The effect is often described as “flow control by synthetic jet”, although it is obvious that the vortex rings generated in the outflow phase of the oscillation are deformed by the controlled flow and also are carried too far away so that they cannot form the classical synthetic jet configuration of vortex rings. Authors describe experiments with such a control applied successfully in an axisymmetric fluidic valve. Presented is a hypothesis explaining the separation mechanism.
Permanent Link: http://hdl.handle.net/11104/0239244