Abstract
Underwater machinery withstands great resistance in the water, which can result in consumption of a large amount of power. Inspired by the character that loach could move quickly in mud, the drag reduction mechanism of Paramisgurnus dabryanus loach is discussed in this paper. Subjected to the compression and scraping of water and sediments, a loach could not only secrete a lubricating mucus film, but also importantly, retain its mucus well from losing rapidly through its surface micro structure. In addition, it has been found that flexible deformations can maximize the drag reduction rate. This self-adaptation characteristic can keep the drag reduction rate always at high level in wider range of speeds. Therefore, even though the part of surface of underwater machinery cannot secrete mucus, it should be designed by imitating the bionic micro-morphology to absorb and store fluid, and eventually form a self-lubrication film to reduce the resistance. In the present study, the Paramisgurnus dabryanus loach is taken as the bionic prototype to learn how to avoid or slow down the mucus loss through its body surface. This combination of the flexible and micro morphology method provides a potential reference for drag reduction of underwater machinery.
Highlights
Underwater machinery withstands great resistance in the water, which can result in consumption of a large amount of power
The loach was placed in the solution for 10 min to remove the mucus on its body surface
ICEM software was used to divide the grid, and it was imported into Fluent
Summary
Underwater machinery withstands great resistance in the water, which can result in consumption of a large amount of power. Even though the part of surface of underwater machinery cannot secrete mucus, it should be designed by imitating the bionic micro-morphology to absorb and store fluid, and eventually form a self-lubrication film to reduce the resistance. The Paramisgurnus dabryanus loach is taken as the bionic prototype to learn how to avoid or slow down the mucus loss through its body surface This combination of the flexible and micro morphology method provides a potential reference for drag reduction of underwater machinery. Chen et al adopted the replica molding method to form a stripe structure like the bird feather on a polymer material They found that, when the flow rate was 5.5 m/s, the underwater drag reduction rate of the striped material reached 16%17. These coatings had poor mechanical strength and the drag reduction function was neither sustainable nor recoverable from failure[21,22,23]
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