Mechanism of autorotation flight of maple samaras (Acer palmatum)

Mechanism of autorotation flight of maple samaras (Acer palmatum) Some winged seeds exhibit autorotation flight during their descent to migrate far away from their parent trees by using oncoming wind. The reduced descent speed of autorotating maple seeds is attributed to the high lift force generated by a leading-edge vortex (LEV). In this study, several prominent features of the autorotation flight of maple samaras (Acer palmatum) were investigated experimentally. The autorotation flight of each maple seed was observed to be very stable during its fall. The nominal values of the dynamic motion parameters were 1.2 m/s for descent velocity, 130.9 rad/s for spinning rate, 22° for coning angle, and 1.5° for pitch angle. Velocity fields of the flow around an autorotating maple samaras model were measured by particle image velocimetry; wind speed was controlled to be similar to the descending velocity. As a result, a highly stable LEV was attached on the leeward side of the autorotating seed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Mechanism of autorotation flight of maple samaras (Acer palmatum)

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-014-1718-4
Publisher site
See Article on Publisher Site

Abstract

Some winged seeds exhibit autorotation flight during their descent to migrate far away from their parent trees by using oncoming wind. The reduced descent speed of autorotating maple seeds is attributed to the high lift force generated by a leading-edge vortex (LEV). In this study, several prominent features of the autorotation flight of maple samaras (Acer palmatum) were investigated experimentally. The autorotation flight of each maple seed was observed to be very stable during its fall. The nominal values of the dynamic motion parameters were 1.2 m/s for descent velocity, 130.9 rad/s for spinning rate, 22° for coning angle, and 1.5° for pitch angle. Velocity fields of the flow around an autorotating maple samaras model were measured by particle image velocimetry; wind speed was controlled to be similar to the descending velocity. As a result, a highly stable LEV was attached on the leeward side of the autorotating seed.

Journal

Experiments in FluidsSpringer Journals

Published: Apr 11, 2014

References

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