Separation control by an array of vortex generator jets: Part 1. Steady jets
(English)Article in journal (Other academic) Submitted
The effect of longitudinal vortices produced by an array of steady jets on a separation bubble was examined experimentally. A adverse pressure gradient on a at plate causes the turbulent boundary layer to separate. The jets are originating from orifices in the wall and are directed 45° from the wall and 90° from the mean flow direction. In the centre of the separated region, particle image velocimetry (PIV) is used to measure the momentum increase near the wall that the vortices produces. An effect maximum is found for a jet velocity that is 5 times the test section inlet velocity. Maxima based on volume flow effciency and energy effciency are also found at lower jet velocities. Furthermore, it is shown that the highest possible effect of the jet array is comparable to that of a vane-type vortex generator array. In sidewind, the jet array is shown to be effective at yaw angles up to 40°.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-9841OAI: oai:DiVA.org:kth-9841DiVA: diva2:133545
This work is part of a cooperative research program between KTH and Scania CV. QS 201203282009-01-122009-01-122012-03-28Bibliographically approved