대한조선학회논문집 (Journal of the Society of Naval Architects of Korea)

  • 제58권4호
  • /
  • Pages.243-252
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  • 2021
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  • 1225-1143(pISSN)
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  • 2287-7355(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
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예인수조 LDV를 이용한 평판 경계층과 와이어 타입 난류촉진장치의 상호작용에 관한 연구

Towed Underwater LDV Measurement of the Interaction of a Wire-Type Stimulator and the Boundary Layer on a Flat Plate

  • 박종열 (서울대학교 조선해양공학과) ;
  • 서정화 (충남대학교 선박해양공학과) ;
  • 이신형 (서울대학교 조선해양공학과)
  • Park, Jongyeol (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Seo, Jeonghwa (Department of Naval Architecture and Ocean Engineering, Chungnam National University) ;
  • Rhee, Shin Hyung (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • 투고 : 2021.03.11
  • 심사 : 2021.06.23
  • 발행 : 2021.08.20
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초록

The present study aims to investigate the interaction of a wire-type turbulence stimulator and the laminar boundary layer on a flat plate by flow field measurement. For the towing tank tests, a one-dimensional Laser Doppler Velocimetry (LDV) attached on a two-axis traverse was used to measure the streamwise velocity component of the boundary layer flow in zero pressure gradient, disturbed by a turbulence stimulator. The wire diameter was 0.5 and 1.0 mm according to the recommended procedures and guidelines suggested by the International Towing Tank Conference. Turbulence development by the stimulator was identified by the skin friction coefficient, mean and Root Mean Square (RMS) of the streamwise velocity. The laminar boundary layer with the absence of the wire-type stimulator was similar to the Blasius solution and previous experimental results. By the stimulator, the mean and RMS of the streamwise velocity were increased near the wall, showing typical features of the fully developed turbulent boundary layer. The critical Reynolds number was reduced from 2.7×105 to 1.0×105 by the disturbances caused by the wire. As the wire diameter and the roughness Reynolds number (Rek) increased, the disturbances by the stimulator increased RMS of the streamwise velocity than turbulent boundary layer.

키워드

과제정보

본 연구는 한국연구재단(NRF-2020R1I1A2074369, NRF-2021R1A6A3A13045434)의 지원을 받아 수행되었으며, 서울대학교 공학연구원의 지원에도 감사를 드립니다.

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