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Lunate-tail swimming propulsion. Part 2. Performance analysis

Published online by Cambridge University Press:  26 April 2006

G. Karpouzian ,
G. Spedding  and
H. K. Cheng
G. Karpouzian
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA Present address: United States Naval Academy, Department of Aerospace Engineering, Annapolis, MD 21402-5042, USA.
G. Spedding
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA
H. K. Cheng
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-1191, USA
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Abstract

The theory of an oscillating, high-aspect-ratio, lifting surface with a curved centreline (Cheng & Murillo 1984) is applied to a performance analysis of lunate-tail swimming propulsion. Thrust, power and propulsive efficiency are calculated for model lunate tails with various combinations of mode shapes and morphological features to ascertain the viability of the proportional-feathering concept, and to determine the influence of sweep and centreline curvature. One of the principal conclusions concerns the interchangeability of the heaving amplitude of the peduncle (identified with the major pitching axis) with the centreline sweep, and its effect on the propulsive efficiency, while maintaining the same thrust. Hydrodynamic reasons are also offered for the apparent preference for the crescent-moon fin shape over the V-shape at moderate sweep angles, and for the large sweep angles often found in V-shaped fins.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 210 , January 1990 , pp. 329 - 351
Copyright
© 1990 Cambridge University Press

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