HEAL DSpace

Flexible Oscillating Duct: An approach to a novel propulsor

DSpace/Manakin Repository

Show simple item record

dc.contributor.author Politis, G en
dc.contributor.author Tsarsitalidis, V en
dc.date.accessioned 2014-03-01T02:09:11Z
dc.date.available 2014-03-01T02:09:11Z
dc.date.issued 2012 en
dc.identifier.issn 01411187 en
dc.identifier.uri http://hdl.handle.net/123456789/29777
dc.subject Biomimetic propulsion en
dc.subject Boundary element method en
dc.subject Unconventional propulsion en
dc.subject Unsteady wake rollup en
dc.subject.other A-train en
dc.subject.other Concept-based en
dc.subject.other Data generation en
dc.subject.other Design method en
dc.subject.other Design parameters en
dc.subject.other Free vortices en
dc.subject.other Hydrodynamic performance en
dc.subject.other Induced velocity en
dc.subject.other Motion data en
dc.subject.other Nonlinear pressure en
dc.subject.other Open water en
dc.subject.other Optimum designs en
dc.subject.other Oscillatory motion en
dc.subject.other Propulsors en
dc.subject.other Time stepping algorithms en
dc.subject.other Trailing edges en
dc.subject.other Unsteady wake en
dc.subject.other Vortex rings en
dc.subject.other Algorithms en
dc.subject.other Biomimetics en
dc.subject.other Boundary element method en
dc.subject.other Ducts en
dc.subject.other Ship propellers en
dc.subject.other Ships en
dc.subject.other Vortex flow en
dc.subject.other Ship propulsion en
dc.subject.other algorithm en
dc.subject.other boundary element method en
dc.subject.other hydrodynamics en
dc.subject.other oscillating flow en
dc.subject.other ship design en
dc.subject.other unsteady flow en
dc.subject.other vortex en
dc.subject.other wake en
dc.subject.other Scyphozoa en
dc.title Flexible Oscillating Duct: An approach to a novel propulsor en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.apor.2012.01.006 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.apor.2012.01.006 en
heal.publicationDate 2012 en
heal.abstract Inspired by a jellyfish, where a bulk muscle oscillatory motion produces thrust, the initiative was taken to explore the propulsion capabilities of a new propulsor concept based on an oscillating/pulsating flexible duct. We name this device 'Flexible Oscillating Duct' (FOD). In this paper our purpose is threefold. Firstly, to understand the FOD's basic thrust producing mechanisms, secondly to present systematic FOD hydrodynamic performance results, necessary for its optimum design, and thirdly to compare the powering performance of ships equipped with FODs with those with conventional propellers. To this end, the problem of an actively deforming FOD, travelling with a given velocity in an infinitely extended fluid, is formulated and solved using an indirect Source-Doublet 3D-BEM, together with a time stepping algorithm capable of tracing the free vortex sheet geometry. A nonlinear pressure type Kutta condition is applied at the trailing edge of the FOD. With a mollifier based filtering of the induced velocities, the unsteady rollup pattern, created by the FOD motion, emerges. The produced pattern indicates that FOD thrust is produced through a train of coaxial vortex rings with circulations of alternating signs. FOD design parameters are then introduced and discussed and decisions were taken regarding creation of a FOD systematic series. A special data generation algorithm has been developed, capable of generating the unsteady thrust-producing motions for the FOD, including chord-wise flexibility. Using this data-generation code, we feed the BEM with systematic geometric and motion data and calculate the open water thrust, power and efficiency for the proposed FOD series. The solution of the FOD optimum design problem for real ships is then presented. The design method has been applied for three ship types. Comparisons show that the FOD is a promising system with propulsive coefficients superior to that of a conventional propeller. © 2012 Elsevier Ltd. en
heal.journalName Applied Ocean Research en
dc.identifier.doi 10.1016/j.apor.2012.01.006 en
dc.identifier.volume 36 en
dc.identifier.spage 36 en
dc.identifier.epage 50 en


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record