The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Study on noise prediction of non-cavitating underwater propeller with hull-appendages effect

선체-부가물 영향을 고려한 비공동 수중추진기의 소음예측 연구

  • 최지훈 (서울대학교 기계항공공학부) ;
  • 설한신 (선박해양플랜트연구소) ;
  • 박일룡 (동의대학교 조선해양공학과) ;
  • 이수갑 (서울대학교 기계항공공학부)
  • Received : 2019.01.25
  • Accepted : 2019.04.16
  • Published : 2019.05.31
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Abstract

In this study, to predict the noise of a submarine propeller which is going to become bigger and faster, the non - cavitating propeller noise was predicted based on the numerical analysis which considering the interaction of the hull - appendages - propeller. In order to predict the radiated noise of the propeller, the flow field for the entire region of hull-appendages-propeller was computed by CFD (Computational Fluid Dynamics). And the noise for the thickness noise and the load noise was numerically predicted using FW-H (Ffwocs Williams-Hawkings) acoustic analogy. Numerical noise prediction results were verified by model tests and showed good agreement with the measurement results in predicting total noise level and low frequency noise.

본 연구에서는 대형화, 고속화되어가는 잠수함 추진기의 소음을 보다 정확하게 예측하기 위하여 선체-부가물-추진기의 상호작용이 묘사되는 유동 수치해석을 토대로 비공동 추진기 소음을 예측하였다. 추진기 방사 소음을 예측하기 위해 선체-부가물-추진기 전체영역에 대한 유동 정보를 전산유체역학 해석으로 얻은 뒤, FW-H(Ffowcs Williams-Hawkings) 음향상사법을 적용하여 두께소음, 하중소음에 대한 소음을 수치적으로 예측하였다. 수치적 소음예측 결과는 모형시험을 통해 검증하였으며, 전체 소음 수준과 저주파 대역 소음예측에 있어 계측결과와 좋은 일치를 보였다.

Keywords

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Fig. 1. Test set-up.

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Fig. 2. Grid for flow simulation.

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Fig. 3. Grid around propeller.

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Fig. 4. Nominal wake at propeller plane.

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Fig. 5. Averaged Velocity on propeller plane.

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Fig. 6. Spectrum of forces on control surface.

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Fig. 7. Numerical prediction result at the observer point.

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Fig. 8. Directivity pattern of numerical prediction.

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Fig. 9. Numerical and Experimental noise spectrum results.

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Fig. 10. Pressure time signal at an arbitrary point on the blade surface.

Table 1. Dimensions of DARPA Suboff and E1619.

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Table 2. LCT model test conditions.

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Table 3. Self-propulsion solution.

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