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Tubercle effect
Aerodynamic phenomenon / From Wikipedia, the free encyclopedia
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The tubercle effect is a phenomenon where tubercles or large 'bumps' on the leading edge of an airfoil can improve its aerodynamics. The effect, while already discovered, was analyzed extensively by Frank E. Fish et al in the early 2000 onwards.[1][2][dubious ā discuss][citation needed] The tubercle effect works by channeling flow over the airfoil into more narrow streams, creating higher velocities. Another side effect of these channels is the reduction of flow moving over the wingtip and resulting in less parasitic drag due to wingtip vortices. Using computational modeling, it was determined that the presence of tubercles produces a delay in the angle of attack until stall, thereby increasing maximum lift and decreasing drag.[1] Fish first discovered[2][citation needed] this effect when looking at the fins of humpback whales. These whales are the only known organisms to take advantage of the tubercle effect. It is believed that this effect allows them to be much more manoeuvrable in the water, allowing for easier capture of prey. The tubercles on their fins allow them to do aquatic maneuvers to catch their prey.[1]
This article may rely excessively on sources too closely associated with the subject, potentially preventing the article from being verifiable and neutral. (September 2017) |
![]() | This article may lend undue weight to the work of a particular author. The effect was well known before Fish et al. analysed it.. (September 2017) |
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The tiny hooklets on the fore edge of an owl's wing have a similar effect that contributes to its aerodynamic manoeuvrability and stealth.[3][4]