TY - CHAP
T1 - Active boundary layer tripping using oscillatory vorticity generator
AU - Yehoshua, Tal
AU - Seifert, Avi
N1 - Funding Information:
Partial funding by the Israeli Science Foundation – equipment initiation fund is acknowledged.
PY - 2006
Y1 - 2006
N2 - The evolution of a train of vortex pairs ejected from a slot into a Blasius boundary layer was studied experimentally, with the aim of active boundary layer tripping. The excitation was directed upstream or downstream, at a shallow angle, or perpendicular to the surface. Vorticity, circulation, trajectories and convection speeds were calculated and used to describe the vortices' evolution. Intermittency, spectra and mean velocity profiles of the forced boundary layer were measured. It was found that shallow downstream directed excitation is very effective for promoting transition.
AB - The evolution of a train of vortex pairs ejected from a slot into a Blasius boundary layer was studied experimentally, with the aim of active boundary layer tripping. The excitation was directed upstream or downstream, at a shallow angle, or perpendicular to the surface. Vorticity, circulation, trajectories and convection speeds were calculated and used to describe the vortices' evolution. Intermittency, spectra and mean velocity profiles of the forced boundary layer were measured. It was found that shallow downstream directed excitation is very effective for promoting transition.
KW - Actuators
KW - Flow control
KW - Laminar boundary layer
KW - Oscillatory vorticity generators
KW - Transition
KW - Turbulence
UR - http://www.scopus.com/inward/record.url?scp=84859852638&partnerID=8YFLogxK
U2 - 10.1007/1-4020-4159-4_47
DO - 10.1007/1-4020-4159-4_47
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AN - SCOPUS:84859852638
SN - 9781402034596
T3 - Fluid Mechanics and its Applications
SP - 335
EP - 340
BT - Sixth IUTAM Symposium on Laminar-Turbulent Transition
PB - Kluwer Academic Publishers
ER -