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Regression Models of 3D Wakes for Propellers
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Regressionsmodeller av 3D medströmsfält för propellrar (Swedish)
Abstract [en]

In this work, regression models for the wake field entering a propeller at certain axial andnominal position have been proposed. Wakes are non-uniform flows following a body immersedin a viscous fluid. We have proposed models for the axial and tangential velocity distribution asfunctions of ship hull and propeller measures. The regression models were modelled using Fourierseries and parameter estimations based on skewed-Gaussian and sine functions. The wake fieldis an important parameter in propeller design. The regression models are based on experimentaldata provided by the Rolls-Royce Hydrodynamic Research Center in Kristinehamn. Also we havestudied the flow in the axial velocity distribution in the propeller plane using the coherent structurecoloring method. The coherent structure coloring is used to study coherent patterns by looking atfluid particle kinematics. Using this type of analysis, we observed that the velocity distributionbehaves kinematically similar in the different regions of the wake distribution, which according tothe coherent structure coloring indicate coherence.

Abstract [sv]

I det här arbetet, har regressionsmodeller för medströmsfältet in i en propeller vid viss axielloch nominell position utvecklats. Medströmsfältet är ojämn strömning efter en kropp nedsänkt i enviskös vätska. Vi har föreslagit modeller för axiell och tangentiell hastighetsfördelning som funktionerför fartygsskrov-och propeller-parametrar. Regressionsmodellerna modellerades med hjälpav Fourier-serier och parameterskattning baserade på skeva Gaussfördelningar och sinusfunktioner.Medströmsfältet är en viktig parameter i propeller design. Regressionsmodellerna är baserade påexperimentella data från Rolls-Royces Hydrodynamiska Forskningscenter i Kristinehamn. Vi harockså studerat flödet i axialhastighetsfördelningen i propellplanet med hjälp av den koherenta struktureringsfärgmetoden.Den koherenta struktureringsfärgmetoden används för att studera koherentamönster genom att titta på vätskepartikelkinematik. Med hjälp av denna typ av analys observeradevi att hastighetsfördelningen uppför sig kinematiskt lika i de olika regionerna i medströmsfältet,vilket enligt koherenta strukturfärgmetoden indikerar koherens.

Place, publisher, year, edition, pages
2018. , p. 59
Keywords [en]
Propeller design, Wake, Velocity distribution, Regression analysis, Fourier series, Skewed-Gaussians, Coherent structure coloring
Keywords [sv]
Propeller design, Medströmsfält, Hastighetsfördelning, Regressionsanalys, Fourierserier, Skeva-Gaussfördelningar, Koherenta struktureringsfärgmetoden
National Category
Other Physics Topics Computational Mathematics
Identifiers
URN: urn:nbn:se:kau:diva-67785OAI: oai:DiVA.org:kau-67785DiVA, id: diva2:1220475
External cooperation
Rolls-Royce Hydrodynamic Research Centre
Subject / course
Physics
Educational program
Engineering: Engineering Physics (300 ECTS credits)
Supervisors
Examiners
Available from: 2018-06-25 Created: 2018-06-18 Last updated: 2018-06-27Bibliographically approved

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Other Physics TopicsComputational Mathematics

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