Flow field and cavitation characteristics of hydrofoils coated with hydrophilic and hydrophobic polymers

T. Mineshima, K. Onishi, Kazuyoshi Miyagawa

Research output: Contribution to journalConference article

Abstract

Tidal power turbines take advantage of tidal energy to generate renewable hydropower. Since the tidal turbines are fixed in the ocean, it is common to paint the blade and the structure of tidal energy generator with antifouling coating to prevent marine organisms from attaching to them. In this research, hydrophilic and hydrophobic coatings which are thought to be useful as countermeasures to prevent marine organisms' adhesion are studied. We focused on the influence of the (hydrophilic and hydrophobic) coatings on the cavitation and flow field characteristics. The hydrophilic coated foil restrained the cavitation inception and growth compared to the hydrophobic coated foil from our experiment. And then, FFT was carried out on the pressure fluctuation measured in each coating foil, and the absolute value of the pressure fluctuation amount and the difference in the fluctuation period were clarified. And as another characteristic of the coated foils, the flow field near the coating surface was investigated. The velocity distribution near the foil's surface was measured using Laser Doppler Velocimetry (LDV). In this experiment, a flat plate with or without the hydrophilic and hydrophobic coatings were used. As a result, differences in the boundary layer thickness and the velocity near the wall were revealed.

Original languageEnglish
Article number062055
JournalIOP Conference Series: Earth and Environmental Science
Volume240
Issue number6
DOIs
Publication statusPublished - 2019 Mar 28
Event29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 - Kyoto, Japan
Duration: 2018 Sep 162018 Sep 21

Fingerprint

cavitation
flow field
coating
polymer
turbine
tidal power
antifouling
adhesion
energy
boundary layer
experiment
laser
ocean

Keywords

  • Boundary layer thickness
  • Cavitation characteristic
  • Coating
  • Flow field
  • Hydrophilic
  • Hydrophobic
  • Laser doppler velocimetry
  • Velocity distribution
  • Wall friction

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Flow field and cavitation characteristics of hydrofoils coated with hydrophilic and hydrophobic polymers. / Mineshima, T.; Onishi, K.; Miyagawa, Kazuyoshi.

In: IOP Conference Series: Earth and Environmental Science, Vol. 240, No. 6, 062055, 28.03.2019.

Research output: Contribution to journalConference article

@article{5dd701ca3e1341fa93238288c9221560,
title = "Flow field and cavitation characteristics of hydrofoils coated with hydrophilic and hydrophobic polymers",
abstract = "Tidal power turbines take advantage of tidal energy to generate renewable hydropower. Since the tidal turbines are fixed in the ocean, it is common to paint the blade and the structure of tidal energy generator with antifouling coating to prevent marine organisms from attaching to them. In this research, hydrophilic and hydrophobic coatings which are thought to be useful as countermeasures to prevent marine organisms' adhesion are studied. We focused on the influence of the (hydrophilic and hydrophobic) coatings on the cavitation and flow field characteristics. The hydrophilic coated foil restrained the cavitation inception and growth compared to the hydrophobic coated foil from our experiment. And then, FFT was carried out on the pressure fluctuation measured in each coating foil, and the absolute value of the pressure fluctuation amount and the difference in the fluctuation period were clarified. And as another characteristic of the coated foils, the flow field near the coating surface was investigated. The velocity distribution near the foil's surface was measured using Laser Doppler Velocimetry (LDV). In this experiment, a flat plate with or without the hydrophilic and hydrophobic coatings were used. As a result, differences in the boundary layer thickness and the velocity near the wall were revealed.",
keywords = "Boundary layer thickness, Cavitation characteristic, Coating, Flow field, Hydrophilic, Hydrophobic, Laser doppler velocimetry, Velocity distribution, Wall friction",
author = "T. Mineshima and K. Onishi and Kazuyoshi Miyagawa",
year = "2019",
month = "3",
day = "28",
doi = "10.1088/1755-1315/240/6/062055",
language = "English",
volume = "240",
journal = "IOP Conference Series: Earth and Environmental Science",
issn = "1755-1307",
publisher = "IOP Publishing Ltd.",
number = "6",

}

TY - JOUR

T1 - Flow field and cavitation characteristics of hydrofoils coated with hydrophilic and hydrophobic polymers

AU - Mineshima, T.

AU - Onishi, K.

AU - Miyagawa, Kazuyoshi

PY - 2019/3/28

Y1 - 2019/3/28

N2 - Tidal power turbines take advantage of tidal energy to generate renewable hydropower. Since the tidal turbines are fixed in the ocean, it is common to paint the blade and the structure of tidal energy generator with antifouling coating to prevent marine organisms from attaching to them. In this research, hydrophilic and hydrophobic coatings which are thought to be useful as countermeasures to prevent marine organisms' adhesion are studied. We focused on the influence of the (hydrophilic and hydrophobic) coatings on the cavitation and flow field characteristics. The hydrophilic coated foil restrained the cavitation inception and growth compared to the hydrophobic coated foil from our experiment. And then, FFT was carried out on the pressure fluctuation measured in each coating foil, and the absolute value of the pressure fluctuation amount and the difference in the fluctuation period were clarified. And as another characteristic of the coated foils, the flow field near the coating surface was investigated. The velocity distribution near the foil's surface was measured using Laser Doppler Velocimetry (LDV). In this experiment, a flat plate with or without the hydrophilic and hydrophobic coatings were used. As a result, differences in the boundary layer thickness and the velocity near the wall were revealed.

AB - Tidal power turbines take advantage of tidal energy to generate renewable hydropower. Since the tidal turbines are fixed in the ocean, it is common to paint the blade and the structure of tidal energy generator with antifouling coating to prevent marine organisms from attaching to them. In this research, hydrophilic and hydrophobic coatings which are thought to be useful as countermeasures to prevent marine organisms' adhesion are studied. We focused on the influence of the (hydrophilic and hydrophobic) coatings on the cavitation and flow field characteristics. The hydrophilic coated foil restrained the cavitation inception and growth compared to the hydrophobic coated foil from our experiment. And then, FFT was carried out on the pressure fluctuation measured in each coating foil, and the absolute value of the pressure fluctuation amount and the difference in the fluctuation period were clarified. And as another characteristic of the coated foils, the flow field near the coating surface was investigated. The velocity distribution near the foil's surface was measured using Laser Doppler Velocimetry (LDV). In this experiment, a flat plate with or without the hydrophilic and hydrophobic coatings were used. As a result, differences in the boundary layer thickness and the velocity near the wall were revealed.

KW - Boundary layer thickness

KW - Cavitation characteristic

KW - Coating

KW - Flow field

KW - Hydrophilic

KW - Hydrophobic

KW - Laser doppler velocimetry

KW - Velocity distribution

KW - Wall friction

UR - http://www.scopus.com/inward/record.url?scp=85063965679&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063965679&partnerID=8YFLogxK

U2 - 10.1088/1755-1315/240/6/062055

DO - 10.1088/1755-1315/240/6/062055

M3 - Conference article

AN - SCOPUS:85063965679

VL - 240

JO - IOP Conference Series: Earth and Environmental Science

JF - IOP Conference Series: Earth and Environmental Science

SN - 1755-1307

IS - 6

M1 - 062055

ER -