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

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on the Frequency Characteristics of Cloud Cavitation on Naval Ship Rudder

함정용 방향타에서 발생하는 구름(cloud) 캐비테이션의 주파수 특성에 대한 실험적 연구

  • Paik, Bu-Geun (Korea Research Institute of Ships & Ocean Engineering) ;
  • Ahn, Jong-Woo (Korea Research Institute of Ships & Ocean Engineering) ;
  • Jeong, Hongseok (Korea Research Institute of Ships & Ocean Engineering) ;
  • Seol, Hanshin (Korea Research Institute of Ships & Ocean Engineering) ;
  • Song, Jae-Yeol (Department of Mechatronics Engineering) ;
  • Ko, Yoon-Ho (Department of Mechatronics Engineering)
  • 백부근 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 안종우 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정홍석 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 설한신 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 송재열 (충남대학교 메카트로닉스공학과) ;
  • 고윤호 (충남대학교 메카트로닉스공학과)
  • Received : 2021.01.12
  • Accepted : 2021.04.12
  • Published : 2021.06.20
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the amount and frequency characteristics of cloud cavitation formed on a navy ship rudder were investigated through cavitation image processing technique and cavitation noise analysis. A high-speed camera with high time resolution was used to observe the cavitation on a full-spade rudder. The deflection angle range of the full-spade rudder was set to 8 to 15 degrees so that cloud cavitation was generated on the rudder surface. For images taken at 104 fps (frame per second), reference values for detecting cavitation were defined and detected in Red, Green, Blue and Hue, Saturation, Lightness color spaces to quantitatively analyze the amount of cavitation. Intrinsic frequency characteristics of cloud cavitation were detected from the time series data of the amount of cavitation. The frequency characteristics of cloud cavitation obtained by using the image processing technique were found to be the same through the analysis of the noise signal measured by the hydrophone installed on the hull above the rudder, and its peak value was in the frequency band of 30~60Hz.

Keywords

Acknowledgement

본 연구는 방위사업청의 민군기술협력사업 UM19206RD2(PNS3840)과제와 '고효율/저소음 선박을 위한 추진기소음 원천기술 개발 및 실선적용 연구 (PES3890)'과제의 지원으로 수행되었으며 이에 감사 드립니다.

References

  1. Ahn, K.S., Choi, G.H., Son, D.I., & Rhee, K.P., 2012. Hydrodynamic characteristics of X-Twisted rudder for large container carriers. International Journal of Naval Architecture and Ocean Engineering, 4, pp.322-334. https://doi.org/10.3744/JNAOE.2012.4.3.322
  2. Boo, K.T., Han, J.M., Song, I.H., & Shin, S.C., 2003. Viscous flow analysis for the rudder section using FLUENT code. Journal of the Society of Naval Architects of Korea, 40(4), pp.30-36. https://doi.org/10.3744/SNAK.2003.40.4.030
  3. Choi, J.E., Chung, S.H., & Lee, D.H., 2007. Cavitating flow characteristics around a 2-dimensional hydrofoil section. Journal of the Society of Naval Architects of Korea, 44(2), pp.74-82. https://doi.org/10.3744/SNAK.2007.44.2.074
  4. Choi, J.E., Kim, J.H., Lee, H.G., & Park, D.W., 2010. Hydrodynamic characteristics and speed performance of a full spade and a twisted rudder. Journal of the Society of Naval Architects of Korea, 47(2), pp.163-177. https://doi.org/10.3744/SNAK.2010.47.2.163
  5. Han, J.M., Kong, D.S., Song, I.H., 2001. Analysis of the cavitating flow around the horn-type rudder in the race of a propeller. CAV2001, Pasadena, 20-23 June, CA, USA.
  6. Jung, J.H. et al., 2013. Study on the angle-of-attack characteristics of the rudder in rotating propeller flow. Journal of the Society of Naval Architects of Korea, 50(6), pp.421-428. https://doi.org/10.3744/SNAK.2013.50.6.421
  7. Kim, M.G., Kim, M.C., Shin, Y.J., & Kang, J.G., 2018. Numerical study on optimization of bulb type twisted rudder for KCS. Journal of Ocean Engineering and Technology, 32(6), pp.419-426. https://doi.org/10.26748/KSOE.2018.32.6.419
  8. Kim, S.P. et al., 2006. An experimental research on gap cavitation erosion of semi-spade rudder. Journal of the Society of Naval Architects of Korea, 43(5), pp.578-585. https://doi.org/10.3744/SNAK.2006.43.5.578
  9. Natarajan, S., 2003. Computational modeling of rudder cavitation and propeller/rudder interaction. MS Thesis, University of Texas at Austin.
  10. Paik, B.G., et al., 2006. Experimental investigation on the gap cavitation of semi-spade rudder. Journal of the Society of Naval Architects of Korea, 43(4), pp.422-430. https://doi.org/10.3744/SNAK.2006.43.4.422
  11. Paik, B.G. et al., 2008. Cavitation observation and visualization of the gap Flows on a rudder influenced by propeller slipstream and hull wakes. Journal of the Society of Naval Architects of Korea, 45(3), pp.238-246. https://doi.org/10.3744/SNAK.2008.45.3.238
  12. Paik, B.G. et al., 2012. Measurements of the rudder inflow affecting the rudder cavitation. Ocean Engineering, 48, pp.1-9. https://doi.org/10.1016/j.oceaneng.2012.03.005
  13. Park, I.R. et al., 2018. Numerical analysis of tip vortex and cavitation of elliptic hydrofoil. With NACA662-415 cross section. Journal of Ocean Engineering and Technology, 32(4), pp.244-252. https://doi.org/10.26748/KSOE.2018.6.32.4.244
  14. Song, I.H., 2004. Cavitation characteristics on various 2-dimensional rudder with gap. Proceedings of the Annual Autumn Meeting SNAK, Sancheong, 20-22 October.
  15. Welch, P., 1967. Use of fast Fourier transform for the estimation of power spectra: a method based on time averaging over short, modified periodograms, IEEE Transactions on Audio and Electroacoustics, 15(2), pp.70-73. https://doi.org/10.1109/TAU.1967.1161901