Abstract
throughout the entire cycle because of attachment of the ow to the ap. In contrast,however, instantaneousdCL=d® is not signi cantly affected. In addition to lift increases, the light-moment stall is eliminated, resulting in a 20% reduction in moment excursions, while excitation induces a further mean nose-down pitching moment of CM;mean » 0:05: Although intrinsically different from the preceding case, a similar control strategy was applied for ap-shoulder excitation. Here, excitation is initiated soon after the commencement of pitchup and terminated in the region where the continuous excitationdownstroke lift data begin to increase.As indicated in the gure, this control strategybroughtabout the maximumpossiblelift excursions, namely between the minimum baseline and maximum excitation limits (CL ;exc D 0:8). In addition, the light-moment stall, which was effectively eliminated by continuous excitation, is also eliminated by intermittent excitation.
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