[논문]선박 추진시스템 유동 소음원 상대적 기여도 분석

하준범; 구가람; 정철웅; 설한신; 정홍석; 정민석

doi:10.7776/ask.2022.41.3.268

[국내논문] 선박 추진시스템 유동 소음원 상대적 기여도 분석
Investigation on relative contribution of flow noise sources of ship propulsion system 원문보기

한국음향학회지= The journal of the acoustical society of Korea, v.41 no.3, 2022년, pp.268 - 277

하준범 (부산대학교 기계공학부) , 구가람 (부산대학교 기계공학부) , 정철웅 (부산대학교 기계공학부) , 설한신 (한국해양과학기술원부설 선박해양플랜트연구소) , 정홍석 (한국해양과학기술원부설 선박해양플랜트연구소) , 정민석 (한국해양과학기술원부설 선박해양플랜트연구소)

초록
AI-Helper

본 논문에서는 KVLCC2 선체 축소모형에 설치된 추진시스템의 세부 구성품별 유동 소음원을 분석하였으며, 각각의 소음원이 수중방사소음에 미치는 영향에 대해 정량적으로 분석하였다. 수치 해석 영역은 실험 결과와의 비교를 위하여 선박해양플랜트연구소 대형 캐비테이션 터널의 시험부와 동일하게 설정하였다. 먼저 유동장내 소음원을 정확하게 모사하기 위하여 고정밀 해석기법인 비압축성 다상 Delayed Detached Eddy Simulation 방법을 적용하였고, 유동해석 결과를 기반으로 Ffowcs Williams and Hawkings 적분방정식을 사용하여 수중방사소음을 예측하였으며, 터널 실험결과와의 비교를 통해 해석절차의 유효성을 확인하였다. 추진시스템의 유동 소음원별 영향을 정량적으로 비교하기 위하여 추진기 날개 끝-와류 공동, 날개 표면 그리고 방향타 표면을 소음원 영역으로 선정하였으며, 음압과 파워 스펙트럼 밀도, 음향 파워를 비교하였다. 공동에 의한 홀극 소음원의 기여도가 추진기 날개 및 방향타에 의한 쌍극 소음원에 비해 수중방사소음에 크게 기여하였으며, 추진기 후류의 영향으로 방향타에 의한 기여도가 추진기 보다 더 크게 발생함을 확인하였다.

Abstract ▼ AI-Helper

In this study, each component of flow noise source of underwater propeller installed to the scale model of the KVLCC2 is investigated and the effect of each noise source on underwater-radiated noise is quantitatively analyzed. The computation domain is set to be the same as the test section of the large cavitation tunnel in the Korea Research Institute of Ship and Ocean Engineering. First, for the high-resolution computation of flow field which is noise source region, the incompressible multiphase Delayed Detached Eddy Simulation is performed. Based on flow simulation results, the Ffowcs Williams and Hawkings integral equation is used to predict underwater-radiated noise and its validity is confirmed through the comparison with the tunnel experiment result. For the quantitative comparison on the contribution of each noise source, the spectral levels of sound pressure and power levels predicted using propeller tip-vortex cavitation, blade surface and rudder surface as the integral region of noise sources are investigated. It is confirmed that the cavitation which is monopole noise source significantly contributed to the underwater-radiated noise than propeller blades and rudder which is dipole noise source, and the rudder have more contribution than propeller blades due to the influence of the propeller wake.

Keyword

표/그림 (16)

그림 Fig. 1. (Color available online) Computational domain and geometries of KVLCC2 and propeller.
그림 Fig. 2. (Color available online) Computational grids around (a) KVLCC2 body, (b) propeller in computation domain.
표 Table 1. Dimensions of LCT, KVLCC2 and propeller.
그림 Fig. 3. (Color available online) Cavitation shape located at the tip of the propeller blade.
그림 Fig. 4. (Color available online) KVLCC2 hull wakefield at propeller plane.
그림 Fig. 5. (Color available online) Comparison of propeller cavitation shape between experimental and numerical results (α=0.1).
그림 Fig. 6. (Color available online) (a) Vorticity at the propeller tip, (b) pressure perturbation on the rudder surface.
그림 Fig. 7. (Color available online) Definition of noise source regions, (a) permeable FW-H including propeller and rudder, observer location, (b) cavitation volume, (c) propeller surface, (d) rudder surface.
그림 Fig. 8. (Color available online) Cavitation volume oscillation along the time variation.
그림 Fig. 9. (Color available online) Comparison of predicted power spectrum density using permeable integral surface with measured ones.
그림 Fig. 10. (Color available online) Comparison of predicted one-third octave band spectrum using permeable integral surface with measured ones.
표 Table 2. Comparison of OASPLs between experimental and numerical results.
그림 Fig. 11. (Color available online) Comparison of predicted power spectrum density for each noise source region defined by Fig. 7 with measured ones.
그림 Fig. 12. (Color available online) Comparison of predicted one-third octave band spectrum for each noise source region defined by Fig. 7 with measured ones.
그림 Fig. 13. (Color available online) Comparison of directivity for each noise source region defined by Fig. 7 along (a) xy-plane, (b) yz-plane, (c) zx-plane.
표 Table 3. Comparison of sound power level for each noise source region.

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