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Investigation of a canonical all-movable control surface in thickened boundary layers

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Ellis, CL, Clarke, DB, Butler, D and Brandner, P ORCID: 0000-0002-6721-878X 2018 , 'Investigation of a canonical all-movable control surface in thickened boundary layers', in TCW Lau and RM Kelso (eds.), Proceedings of the 21st Australasian Fluid Mechanics Conference 2018 , Australasian Fluid Mechanics Society, Adelaide, Australia, pp. 1-4 .

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Abstract

Submarine aft control surfaces are low aspect ratio appendagesthat operate, under normal conditions, with a significant portionof their span submerged in the hull boundary layer. These aftcontrol surfaces have a significant gap between the root and hullwhen placed at incidence. The loads and stall behaviour of thesecontrol surfaces are of interest as they directly influence asubmarines ability to maneuver, maintain stability and impact thespatial and temporal uniformity of the flow into the propeller.The hull boundary layer and the root-hull gap have a significantinfluence on the control surface performance.The cavitation tunnel at the Australian Maritime College (AMC)Cavitation Research Laboratory (CRL) can produce a range ofthickened and thinned boundary layers on its ceiling. Thiscapability was used to create a boundary layer with similarmomentum deficit to that which occurs at the aft of a submarine.This allows us to obtain force measurements more representativeof the conditions on a real submarine for a submarine aft controlsurface. The loads and stall behaviour of a canonical all-movablecontrol surface were investigated for a range of boundary layerthicknesses and root gap sizes. An increased root gap wasobserved to increase stall angles and reduce the lift curve slope atlow angles of incidence. The thickened boundary layers wereobserved to have a significant influence on the loadmeasurements during stall, with reduced hysteresis, increasedmaximum lift and increased stall angle. A momentum basedestimate was effective in accounting for the influence of thethickened boundary layer on the measured loads.

Item Type: Conference Publication
Authors/Creators:Ellis, CL and Clarke, DB and Butler, D and Brandner, P
Keywords: control surface, thickened boundary layer, root gap, hydrodynamic performance
Journal or Publication Title: Proceedings of the 21st Australasian Fluid Mechanics Conference 2018
Publisher: Australasian Fluid Mechanics Society
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