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

Designing of Safe Duct for Leisure Boat with Wing Section

익형 형상을 적용한 레저 선박용 안전 덕트 개발

  • Sang-Jun Park (Pusan National University Naval Architecture and Ocean Engineering) ;
  • Jin-Wook Kim (Pusan National University Naval Architecture and Ocean Engineering) ;
  • Moon-Chan Kim (Pusan National University Naval Architecture and Ocean Engineering) ;
  • Woo-Seok Jin (Pusan National University Naval Architecture and Ocean Engineering) ;
  • Sa-Kyo Jung (Able ENC)
  • 박상준 (부산대학교 조선해양공학과) ;
  • 김진욱 (부산대학교 조선해양공학과) ;
  • 김문찬 (부산대학교 조선해양공학과) ;
  • 진우석 (부산대학교 조선해양공학과) ;
  • 정사교 (에이블 이앤씨)
  • Received : 2023.07.07
  • Accepted : 2023.09.27
  • Published : 2023.12.20
Download PDF
⟨ Previous Next ⟩

Abstract

This study deals with the design of a safety device around a leisure boat propeller. The safety device is to be designed to minimize performance degradation attached to propulsors in coastal waters. These devices, important for preventing propeller accidents, negatively gives influence boat performance, especially at higher speeds. In order to minimize the negative effect, the accelerating ducts, normally used in ESDs (Energy Saving Devices) have been chosen as a safety device. The present study aims to design an optimal duct (minimizing negative effect) through the parametric study. Based on the Marine 19A nozzle, the nozzle's thickness and angle were varied to obtain the optimum parameter in the preliminary design by the computational fluid dynamics program Star-CCM+ Ver. 15.02. In the detailed design, a NACA 4-digit Airfoil shape resembling the Marine 19A by modification at the trailing edge was chosen and the optimum shape was chosen according to variation of camber, thickness, and incidence angle for optimization. The optimally designed duct shows a speed decrease of about 10% in the sea trial result, which is much smaller than the normal speed decrease of at least 30%. The present designing method can give wide applications to the leisure boat because the wake is almost the same due to using the outboard propulsor.

Keywords

Acknowledgement

이 과제는 부산대학교 기본연구지원사업(2년) 및 부산대학교 BK21 4단계 스마트 조선해양공학 교육연구단의 지원에 의하여 연구되었음.

References

  1. Abbott, I.H. and Von Doenhoff, A.E., 1959. Theory of wing sections : Including a Summary of Airfoil Data. Dover Publications, Inc : New York.
  2. Bontempo, R. and Manna, M., 2018. Performance analysis of ducted marine propellers. Part II-Accelerating duct. Applied Ocean Research, 75, pp.153-164. https://doi.org/10.1016/j.apor.2018.03.005
  3. Celik, F., Dogrul, A. and Arikan, Y., 2011. Investigation of the optimum duct geometry for a passenger ferry. In: Proceedings of the 9th Symposium on High Speed Marine Vehicles. Naples, 25-27 May 2011.
  4. Gaggero, S., Villa, D., Tani, G., Viviani, M. and Bertetta, D., 2017. Design of ducted propeller nozzles through a RANSE-based optimization approach. Ocean Engineering, 145, pp.444-463. https://doi.org/10.1016/j.oceaneng.2017.09.037
  5. International Towing Tank Conference(ITTC), 2017. High speed marine vehicles resistance test [Online]. (Updated June 2017) Available at: https://www.ittc.info/media/9665/75-02-05-02.pdf[Accessed 12 April 2022].
  6. International Towing Tank Conference(ITTC), 2017. High speed marine vehicles propulsion test [Online]. (Updated March 2017) Available at: https://www.ittc.info/media/9663/75-02-05-01.pdf [Accessed 12 April 2022].
  7. International Towing Tank Conference(ITTC), 2021. 1978 ITTC performance prediction method [Online]. (Updated March 2021) Available at: https://www.ittc.info/media/9872/75-02-03-014.pdf [Accessed 12 April 2022].
  8. Markets and Markets, 2021. Recreational boat market by boat type (sailboats, PWC, inflatables), size (<30 feet,>50 feet), engine placement (outboards, inboards), engine (ICE, electric), material (aluminium, fiberglass), activity type, power source & region-global forecast to 2027, Pune:Markets and Markets
  9. Mancini, S., Luca, F.D. and Ramolini, A., 2017. Towards CFD guidelines for planing hull simulations based on the Naples Systematic Series. VII International Conference on Computational Methods in Marine Engineering, Marine 2017, pp.1071-1085.
  10. National Fire Research Agency, 2020. Fire and rescue boat also requires a propeller guard, Fire Prevention News, 2020.5, pp.66-74.
  11. Oosterveld, M.W.C., 1970. Wake adapted ducted propellers. Ph.D. Delft: Technische Universiteit Delft.
  12. Shin, S.W., 2020. A study on the performance characteristics of planning hull with spray rail. PH.D. Busan: Pukyong National University.