Validation of a flow channel to investigate velocity profiles of friction-reducing ship coatings

• Autorzy: Weisheit J. , Schneider V. E. , Serr J. M. , Hagemeister N. , Oeffner J.

Identyfikatory

DOI

10.12716/1001.15.01.24

• Języki publikacji: EN

Abstrakty

EN

Reducing friction with specialised hull coatings or air lubrication technologies has a potential reducing energy consumption and emissions in shipping. The EU project AIRCOAT combines both by developing a passive air lubrication technology inspired by nature that is implemented on a self-adhesive foil system. Besides validating the friction reduction it is of high interest to understand the underlying mechanism that causes the reduction. Therefore, a flow channel was designed, that creates a stationary turbulent flow within a square duct allowing for non-invasive measurements by laser doppler velocimetry. The high spatial resolution of the laser device makes recording velocity profiles within the boundary layer down to the viscous sublayer possible. Determination of the wall shear stress τ enables direct comparison of different friction reduction experiments. In this paper we validate the methodology by determining the velocity profile of the flat channel wall (without coatings). We further use the results to validate a CFD model in created in OpenFOAM. We find that velocities along the longitudinal axis are generally in good agreement between numerical and experimental investigations.

Słowa kluczowe

EN

ship coatings; flow Channel; vessel velocity; laser Doppler velocimeter; computational fluid dynamics; AIRCOAT project; reynolds averaged navier stokes; measurement volume

• Wydawca: Faculty of Navigation, Gdynia Maritime University
• Czasopismo: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
• Rocznik: 2021
• Tom: Vol. 15 No. 1
• Strony: 225--231
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Weisheit J.

• Fraunhofer Centre for Maritime Logistics and Services CML, Hamburg, Germany

autor

Schneider V. E.

• Fraunhofer Centre for Maritime Logistics and Services CML, Hamburg, Germany

autor

Serr J. M.

• Fraunhofer Centre for Maritime Logistics and Services CML, Hamburg, Germany

autor

Hagemeister N.

• Fraunhofer Centre for Maritime Logistics and Services CML, Hamburg, Germany

autor

Oeffner J.

• Fraunhofer Centre for Maritime Logistics and Services CML, Hamburg, Germany

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).