Volume 97, Number 4, February 2012
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||21 February 2012|
Manipulating thrust wakes: A parallel with biomimetic propulsion
Laboratoire de Physique et Mécanique des Milieux Hétérogènes, PMMH UMR 7636 CNRS-ESPCI-UPMC Paris 6, Université Paris Diderot - 10 rue Vauquelin, 75005 Paris, France, EU
Accepted: 16 January 2012
We present an experiment to investigate the role of shed vortices in thrust production. Using two different mechanisms, harmonic acoustic forcing and vortex trapping, a dry-air jet was manipulated to give the wake a typical propulsive-like pattern as observed behind swimmers or flyers. Our results show that even in a thrust production configuration, wakes with asymmetric roll-up of vortices are always associated to performance loss. By contrast, cases involving symmetric modes show thrust enhancement, as reported in very recent studies on pulsed jet propulsion.
PACS: 47.63.M- – Biopropulsion in water and air / 47.32.ck – Vortex streets / 47.32.cb – Vortex interactions
© EPLA, 2012
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