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

The Society of Naval Architects of Korea (대한조선학회)
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Vortex Cavitation Inception Delay by Attaching a Twisted Thread

Twisted thread에 의한 보텍스 캐비테이션 초생지연

  • Park, Sang-Il (The Republic of Korea Navy) ;
  • Lee, Seung-Jae (Research Institute of Marine Systems Engineering, Seoul National University) ;
  • You, Guek-Sang (Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Suh, Jung-Chun (Research Institute of Marine Systems Engineering, Seoul National University)
  • 박상일 (대한민국 해군) ;
  • 이승재 (서울대학교 해양시스템공학연구소) ;
  • 유극상 (서울대학교 조선해양공학과) ;
  • 서정천 (서울대학교 해양시스템공학연구소)
  • Received : 2014.01.14
  • Accepted : 2014.04.16
  • Published : 2014.06.20
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Abstract

Tip vortex cavitation (TVC) is important for naval ships and research vessels that require raising the cavitation inception speed to maximum possible values. The concepts for alleviating the tip vortex are summarized by Platzer and Souders (1979), who carried out a thorough literature survey. Active control of TVC involves the injection of a polymer or water from the blade tip. The main effect of such mass injection (both water and polymer solutions) into the vortex core is an increase in the core radius, consequently delaying TVC inception. However, the location of the injection port needs to be selected with great care in order to ensure that the mass injection is effective in delaying TVC inception. In the present study, we propose a semi-active control scheme that is achieved by attaching a thread at the propeller tip. The main idea of a semi-active control is that because of its flexibility, the attached thread can be sucked into the low-pressure region closer to the vortex core center. An experimental study using a scale model was carried out in the cavitation tunnel at the Seoul National University. It was found that a flexible thread can effectively suppress the occurrence of TVC under the design condition for a model propeller.

Keywords

References

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