선박저항성능연구실Outer-layer vertical blades
Disrupt regeneration mechanism of hairpin vortices→Drag reduction
Basic Research (Prof. Kwing-So Choi) : max. 25% local drag reduction
Applicability test : How large global drag reduction ?
Towing tank : max. 2.25%, Circulating water channel : max. 4.54%
Compliant Coating : Biomimetics (Dolphin’s skin)
Turbulent pressure → Surface deformation → Attenuation of Reynolds stress → Skin friction reduction (~7%)
Optimization of dynamic viscoelastic properties
Tuning to the frequency & wavelength of turbulent pressure field
5% drag reduction : further improvement expected
공기윤활기법 : Modular Carrier
Energy saving by air lubrication : visualization of air film → optimization of air injection
C-17st-5mm / Net Saving : -7.44%
C-17-13st-5mm(1-9)) / Net Saving : 33.87%
공기윤활기법 : 66k Bulk Carrier
Flat bottom area : 42.21% (WSA)
공기분사유량 최소화 → 에너지 저감효과 극대화
Optimal case : 19.2% net energy saving (pumping power = 1.65% of NCR)
저마찰 선박 방오도료
마찰저항 저감 고분자 신소재 (FDR-SPC) 세계 최초 합성 (공동개발 박현 교수) : 마찰저항저감율 13.5% 달성 (매끈한 표면 대비)
FDR-SPC 기반 저마찰 선박 방오도료 개발 : 마찰저항저감율 25.4% 달성 (기존 선박도료 대비)
저마찰 선박 방오도료 실선 적용 : Capesize bulk 선 (‘15.12)
장기간 마찰저항 성능 : 6개월
실선 적용성 (방오성능) 검증 : immersion panel & patch test
실선 운항성능 ISO19030 기반 평가 : 선속 증가 10.2%, DFOC (연료소모량) 저감 48.06%
| 입거 전 (8개월) | 입거 후 (8개월) | ||||||
|---|---|---|---|---|---|---|---|
| Speed | DFOC | Speed | DFOC | ||||
| Ballast | Laden | Ballast | Laden | Ballast | Laden | Ballast | Laden |
| -14.96% | -13.05% | 81.21% | 58.16% | -6.65% | -2.87% | 28.53% | 10.10% |
