Figure 5 - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
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The impact of AR on the (a) thrust coefficient and (b) efficiency of the single flipper, undergoing heave-to-pitch coupling. Simulation points are characterised by • while the best fit curve is depicted via a dashed line.
Source publication
In this work, we describe the impact of aspect ratio (AR) on the performance of optimally phased, identical flapping flippers in a tandem configuration. Three-dimensional simulations are performed for seven sets of single and tandem finite foils at a moderate Reynolds number, with thrust producing, heave-to-pitch coupled kinematics. Increasing slen...
Contexts in source publication
Context 1
... performance of the single flipper at varying AR can be seen in figure 5. Elongation leads to a sharp increase of the thrust coefficient until í µí°´í µí± ∼ 4 where the curve starts to asymtote for higher AR, where í µí»¿˜íµí»¿˜ µí»¿˜í µí° ¶ í µí± í µí»¿ í µí°´í µí± ≤ 3% (beyond AR > 6). ...
Context 2
... of the procedure can be found in Appendix B. As shown in figure 7a, the TEV appears to become more compact for higher AR, causing Γ to saturate at a constant value (see figure 7b). This in turn, leads to a constant velocity surplus across the flipper span which is reflected in behaviour of the thrust in figure 5. Here we should note that, similar˜ísimilar˜ similar˜í µí° ¶ í µí± − í µí°´í µí± relationships have been reported by Shao et al. (2010) despite the latters different planform geometry (no wingtip) and significantly lower í µí± í µí± C . ...
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