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Fig. 17. Lift coefficients as functions of time for one wing moving with the same
clap and fling motion as shown in Fig.
16. The letters i–viii along the x axis correspond
to the times the streamlined plots labelled i–viii in
Fig. 15B were drawn. The angle
of attack during pure translation was set to 45°. The Reynolds number
(Re) was varied by changing the translational velocity of the wing
from 0.00375 to 0.06 m s–1. In general, lift coefficients
increase with Re. The lift forces generated during the initial
upstroke are very similar to those shown in the two-winged case (i–iii).
During fling, lift coefficients during rotation and the subsequent translation
(vi–viii) are significantly less than the two-winged case for
Re=32 and below.
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