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

  • 제60권1호
  • /
  • Pages.31-37
  • /
  • 2023
  • /
  • 1225-1143(pISSN)
  • /
  • 2287-7355(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
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함정의 평판형 방향타 캐비테이션 침식에 대한 모형 시험 연구

Study on the Model Tests of Cavitation Erosion Occurring in Navy Ship's Flat-Type Rudder

  • 백부근 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 안종우 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 박영하 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • ;
  • 송재열 (충남대학교 메카트로닉스공학과) ;
  • 고윤호 (충남대학교 메카트로닉스공학과)
  • Bu-Geun Paik (Korea Research Institute of Ships & Ocean Engineering) ;
  • Jong-Woo Ahn (Korea Research Institute of Ships & Ocean Engineering) ;
  • Young-Ha Park (Korea Research Institute of Ships & Ocean Engineering) ;
  • So-Won Jeong (Korea Research Institute of Ships & Ocean Engineering) ;
  • Jae-Yeol Song (Department of Mechatronics Engineering, Chungnam National University) ;
  • Yoon-Ho Ko (Department of Mechatronics Engineering, Chungnam National University)
  • 투고 : 2022.11.24
  • 심사 : 2023.01.05
  • 발행 : 2023.02.20
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초록

In the present study, a method of performing cavitation erosion test directly on the anodized surface of the rudder model is proposed, not applying ink or paint on its surface. An image processing technique is newly developed to quantitatively evaluate the erosion damages on the rudder model surface after erosion test. The preprocessing saturation image, image smoothing, adaptive hysteresis thresholding and eroded area detection algorithms are in the image processing program. The rudder cavitation erosion tests are conducted in the rudder deflection angle range of 0° to -4°, which is used to maintain a straight course at the highest speed of the targeted navy ship. In the case of the conventional flat-type full-spade rudder currently being used in the target ship, surface erosion can occur on the model rudder surface in the above rudder deflection angle range. The bubble type of cavitation occurs on rudder surface, which is estimated to be the main reason of erosion damage on the rudder surface.

키워드

과제정보

본 연구는 민군겸용기술개발사업 19-CM-MU-10 (PNS4520, 3차원 곡면형 비틀림 방향타 기술) 과제의 지원으로 수행되었으며 이에 감사드립니다.

참고문헌

  1. Aktas, B., Usta, O. and Atlar, M., 2020. Systematic investigation of coating application methods and soft paints types to detect cavitation erosion on marine propellers. Applied Ocean Research, 94, 101868.
  2. Keller, A.P., 2001. Cavitation scale effects empirically found relations and the correlation of cavitation number and hydrodynamic coefficients. CAV2001, Paris, France, 18-22 July.
  3. Kim, K.S. et al., 2014. Base technology of test estimation for propeller and rudder performance (5th year). KRISO Report.
  4. Paik, B.G., Ahn, J.W., Jeong, H.S., Seol, H.S., Song, J.Y. and Ko, Y.H., 2021. An experimental study on the frequency characteristics of cloud cavitation on naval ship rudder. Journal of the Society of Naval Architecture of Korea, 58(3), pp.167-174. https://doi.org/10.3744/SNAK.2021.58.3.167
  5. Pfitsch, W., Gowing, S., Fry, D., Donnelly, M. and Jessup, S., 2009. Development of measurement techniques for studying propeller erosion damage in severe wake fields. CAV2009, Ann Arbor, Michigan, USA, 17-22 August.