Review of Fluid Dynamic and Acoustic Performance of Biologically Inspired Passive Flow Control Trailing Edge Devices for Design Applications

Wolfe, Tristan

doi:10.2514/6.2017-0542

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…The propulsive flukes have a serrated trailing edge emulating battlements or crenelations. The pattern of crenelations is similar to measurements on the wings of owls for acoustic benefits (Wolfe 2017). Similarly, the trailing edge of the flippers of the California sea lion (Zalophus californianus) are crenelated (figure 6), although the hydrodynamic and hydroacoustics have not been investigated.…”

Section: Stealthsupporting

confidence: 66%

Advantages of aquatic animals as models for bio-inspired drones over present AUV technology

Fish

2020

Bioinspir. Biomim.

111

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Robotic systems are becoming more ubiquitous, whether on land, in the air, or in water. In the aquatic realm, aquatic drones including ROVs (remotely operated vehicles) and AUVs (autonomous underwater vehicles) have opened new opportunities to investigate the ocean depths. However, these technologies have limitations related to shipboard support, programing, and functionality in complex marine environments. A new form of AUV is being developed to become operational. These drones are based on animal designs and capabilities. Biological AUVs (BAUVs) promise to improve performance in the varied environments of the ocean. Comparison of animal swimming performance with conventional AUVs and BAUVs demonstrates that natural systems still have swimming capabilities beyond the current state of AUV technology. However, the performances of aquatic animals with respect to swimming speed, efficiency, maneuverability, and stealth can serve as benchmarks to direct the development of bio-inspired AUV technology with enhanced capabilities.

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Section: Stealthsupporting

confidence: 66%

Advantages of aquatic animals as models for bio-inspired drones over present AUV technology

Fish

2020

Bioinspir. Biomim.

111

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“…The flukes of humpback whales possess crenellations along their span, which could act as trailing-edge control surface modifications. These small extensions of the trailing edge are larger in height near the fluke midspan and then sharply decrease towards the tip of each fluke (Wolfe, 2017). It is unknown what the hydrodynamic effects of such crenellations are, but studies of wavy and serrated trailing edges, including those of owl wings, have implicated drag reduction, stall alleviation and noise abatement (Werle et al, 1987;Bachmann and Wagner, 2011;Wolfe, 2017).…”

Section: Tip and Trailing Edge Structuresmentioning

confidence: 99%

Control surfaces of aquatic vertebrates: active and passive design and function

Fish

Lauder

2017

Journal of Experimental Biology

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Aquatic vertebrates display a variety of control surfaces that are used for propulsion, stabilization, trim and maneuvering. Control surfaces include paired and median fins in fishes, and flippers and flukes in secondarily aquatic tetrapods. These structures initially evolved from embryonic fin folds in fishes and have been modified into complex control surfaces in derived aquatic tetrapods. Control surfaces function both actively and passively to produce torque about the center of mass by the generation of either lift or drag, or both, and thus produce vector forces to effect rectilinear locomotion, trim control and maneuvers. In addition to fins and flippers, there are other structures that act as control surfaces and enhance functionality. The entire body can act as a control surface and generate lift for stability in destabilizing flow regimes. Furthermore, control surfaces can undergo active shape change to enhance their performance, and a number of features act as secondary control structures: leading edge tubercles, wing-like canards, multiple fins in series, finlets, keels and trailing edge structures. These modifications to control surface design can alter flow to increase lift, reduce drag and enhance thrust in the case of propulsive fin-based systems in fishes and marine mammals, and are particularly interesting subjects for future research and application to engineered systems. Here, we review how modifications to control surfaces can alter flow and increase hydrodynamic performance.

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Review of Fluid Dynamic and Acoustic Performance of Biologically Inspired Passive Flow Control Trailing Edge Devices for Design Applications

Cited by 2 publications

References 38 publications

Advantages of aquatic animals as models for bio-inspired drones over present AUV technology

Advantages of aquatic animals as models for bio-inspired drones over present AUV technology

Control surfaces of aquatic vertebrates: active and passive design and function

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