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Characterizing influence of transition to turbulence on the propulsive performance of underwater gliders

Characterizing influence of transition to turbulence on the propulsive performance of underwater gliders
Characterizing influence of transition to turbulence on the propulsive performance of underwater gliders
Two models of underwater gliders were tested in a wind tunnel, one corresponding to a legacy shape commonly used in contemporary vehicles, the other being a scaled-down version of a new design. Performance of the two vehicles was characterised over a range of speeds and angles of attack. Particular attention was paid to the effect of sharp features along the hulls of the two vehicles and how they affect the observed flow regime. It has been shown that the new design, which employs a bow shaped to encourage natural laminar flow, benefits from a 10% reduction of parasitic drag and 13%
increase in L/D when the hull surface is smooth. The legacy glider, made up of a faired bow and a cylindrical hull, suffers from laminar separation and up to 100% increase in induced drag if the flow over its bow is prevented from transitioning to a turbulent state before encountering adverse pressure gradient at lower Reynolds numbers. This results in lowering of attainable speed at shallow glide path angles while the associated parasitic drag reduction is demonstrated to increase the maximum velocity of the glider when moving at glide slopes above approximately 30.
autonomous underwater vehicle, experimental fluid dynamics, hydrodynamic performance, Underwater glider
0022-4502
1-8
Lidtke, Artur
5570c46b-09b5-4345-9f5c-7a5ed2a29ffc
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Downes, Jonathan
ebc0f09b-9d33-4815-bedf-bc77df59c822
Lidtke, Artur
5570c46b-09b5-4345-9f5c-7a5ed2a29ffc
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Downes, Jonathan
ebc0f09b-9d33-4815-bedf-bc77df59c822

Lidtke, Artur, Turnock, Stephen and Downes, Jonathan (2019) Characterizing influence of transition to turbulence on the propulsive performance of underwater gliders. Journal of Ship Research, 1-8. (doi:10.5957/JOSR.09180050).

Record type: Article

Abstract

Two models of underwater gliders were tested in a wind tunnel, one corresponding to a legacy shape commonly used in contemporary vehicles, the other being a scaled-down version of a new design. Performance of the two vehicles was characterised over a range of speeds and angles of attack. Particular attention was paid to the effect of sharp features along the hulls of the two vehicles and how they affect the observed flow regime. It has been shown that the new design, which employs a bow shaped to encourage natural laminar flow, benefits from a 10% reduction of parasitic drag and 13%
increase in L/D when the hull surface is smooth. The legacy glider, made up of a faired bow and a cylindrical hull, suffers from laminar separation and up to 100% increase in induced drag if the flow over its bow is prevented from transitioning to a turbulent state before encountering adverse pressure gradient at lower Reynolds numbers. This results in lowering of attainable speed at shallow glide path angles while the associated parasitic drag reduction is demonstrated to increase the maximum velocity of the glider when moving at glide slopes above approximately 30.

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Accepted/In Press date: 29 January 2019
e-pub ahead of print date: 21 February 2019
Keywords: autonomous underwater vehicle, experimental fluid dynamics, hydrodynamic performance, Underwater glider

Identifiers

Local EPrints ID: 430450
URI: https://eprints.soton.ac.uk/id/eprint/430450
ISSN: 0022-4502
PURE UUID: afa5d4db-0755-42cd-bf4e-aaf0d4be2eb0
ORCID for Artur Lidtke: ORCID iD orcid.org/0000-0002-2687-3083
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400
ORCID for Jonathan Downes: ORCID iD orcid.org/0000-0003-2027-4474

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Date deposited: 01 May 2019 16:30
Last modified: 02 May 2019 00:42

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