VTechWorks staff will be away for the Independence Day holiday from July 4-7. We will respond to email inquiries on Monday, July 8. Thank you for your patience.
 

Influence of Propulsion Type on the Stratified Near Wake of an Axisymmetric Self-Propelled Body

Simple item page
dc.contributor.authorJones, Matthew C.en
dc.contributor.authorPaterson, Eric G.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2018-06-25T12:21:16Zen
dc.date.available2018-06-25T12:21:16Zen
dc.date.issued2018-05-01en
dc.date.updated2018-06-25T07:43:30Zen
dc.description.abstractTo better understand the influence of swirl on the thermally-stratified near wake of a self-propelled axisymmetric vehicle, three propulsor schemes were considered: a single propeller, contra-rotating propellers (CRP), and a zero-swirl, uniform-velocity jet. The propellers were modeled using an Actuator-Line model in an unsteady Reynolds-Averaged Navier&ndash;Stokes simulation, where the Reynolds number is <math display="inline"> <semantics> <mrow> <mi>R</mi> <msub> <mi>e</mi> <mi>L</mi> </msub> <mo>=</mo> <mn>3.1</mn> <mo>&times;</mo> <msup> <mn>10</mn> <mn>8</mn> </msup> </mrow> </semantics> </math> using the freestream velocity and body length. The authors previously showed good comparison to experimental data with this approach. Visualization of vortical structures shows the helical paths of blade-tip vortices from the single propeller as well as the complicated vortical interaction between contra-rotating blades. Comparison of instantaneous and time-averaged fields shows that temporally stationary fields emerge by half of a body length downstream. Circumferentially-averaged axial velocity profiles show similarities between the single propeller and CRP in contrast to the jet configuration. Swirl velocity of the CRP, however, was attenuated in comparison to that of the single propeller case. Mixed-patch contour maps illustrate the unique temperature distribution of each configuration as a consequence of their respective swirl profiles. Finally, kinetic and potential energy is integrated along downstream axial planes to reveal key differences between the configurations. The CRP configuration creates less potential energy by reducing swirl that would otherwise persist in the near wake of a single-propeller wake.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationJones, M.C.; Paterson, E.G. Influence of Propulsion Type on the Stratified Near Wake of an Axisymmetric Self-Propelled Body. J. Mar. Sci. Eng. 2018, 6, 46.en
dc.identifier.doihttps://doi.org/10.3390/jmse6020046en
dc.identifier.urihttp://hdl.handle.net/10919/83718en
dc.language.isoenen
dc.publisherMDPIen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectactuator lineen
dc.subjectnear wakeen
dc.subjectstratifieden
dc.subjectnet-zero momentumen
dc.subjectself-propelleden
dc.subjectmixed patchen
dc.subjectenergy budgeten
dc.subjectaxisymmetricen
dc.titleInfluence of Propulsion Type on the Stratified Near Wake of an Axisymmetric Self-Propelled Bodyen
dc.title.serialJournal of Marine Science and Engineeringen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
jmse-06-00046.pdf
Size:
14.35 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
Name:
license.txt
Size:
1.5 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Journal Articles, Multidisciplinary Digital Publishing Institute (MDPI)
Scholarly Works, Aerospace and Ocean Engineering