Experimental and Computational Investigation of the Knoller-Betz Effect

The ability of a sinusoidally plunging airfoil to produce thrust, known as the Knoller-Betz or Katzmayr effect, is investigated experimentally and numerically. Water-tunnel experiments are performed providing flow visualization and laser Doppler velocimetry data of the unsteady wakes formed by the p...

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Bibliographic Details
Published in:AIAA journal 1998-07, Vol.36 (7), p.1240-1246
Main Authors: Jones, K. D, Dohring, C. M, Platzer, M. F
Format: Article
Language:English
Subjects:
Aerodynamics
Aircraft
Applied fluid mechanics
Aviation
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
Rotational flow and vorticity
Separated flows
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Summary:The ability of a sinusoidally plunging airfoil to produce thrust, known as the Knoller-Betz or Katzmayr effect, is investigated experimentally and numerically. Water-tunnel experiments are performed providing flow visualization and laser Doppler velocimetry data of the unsteady wakes formed by the plunging foils. Vortical structures and time-averaged velocity profiles in the wake are compared with numerical computations from a previously developed inviscid, unsteady panel code that utilizes a nonlinear wake model.
ISSN:0001-1452
1533-385X
DOI:10.2514/2.505