로터 세일의 표면 형상과 조도 변화에 따른 마그누스 효과에 관한 실험연구
Experimental Study on the Effects of Surface Shape and Roughness on the Magnus Effect of Rotor Sails
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In this study, we devised methods to enhance the efficiency of rotor sails which have been applied as one of the energy saving devices of ships. The idea of the study originated from the notion that installing protrusions or increasing the surface roughness on the smooth surface of the rotor sail could delay the separation of the incoming wind flow and consequently increase the lift force. Five cylinder models were considered and tested in an open-type wind tunnel at Chungnam National University. A smooth surface cylinder exhibits the highest lift-to-drag ratio at a specific Reynolds number, and as the Reynolds number increases this value decreases sharply. The variation in this typical Magnus force can be significantly improved by altering the surface shape and roughness of the rotor sail. It has been observed that increasing the surface roughness improves the lift characteristics, resulting in increased efficiency. Furthermore, it revealed that the reverse Magnus effect which may occur during actual operation in the low spin ratio region can be significantly enhanced.
Abstract
In this study, we devised methods to enhance the efficiency of rotor sails which have been applied as one of the energy saving devices of ships. The idea of the study originated from the notion that installing protrusions or increasing the surface roughness on the smooth surface of the rotor sail could delay the separation of the incoming wind flow and consequently increase the lift force. Five cylinder models were considered and tested in an open-type wind tunnel at Chungnam National University. A smooth surface cylinder exhibits the highest lift-to-drag ratio at a specific Reynolds number, and as the Reynolds number increases this value decreases sharply. The variation in this typical Magnus force can be significantly improved by altering the surface shape and roughness of the rotor sail. It has been observed that increasing the surface roughness improves the lift characteristics, resulting in increased efficiency. Furthermore, it revealed that the reverse Magnus effect which may occur during actual operation in the low spin ratio region can be significantly enhanced.
참고문헌 (11)
- "Anemoi-Marine-Technologies-Brochure"[URL]
- Badalamenti, C., "Effects of endplates on a rotating cylinder in crossflow", 26th AIAA Applied Aerodynamics Conference (2008)
- Bordogna, G., "Experiments on a flettner rotor at critical and supercritical reynolds numbers", Journal of Wind Engineering and Industrial Aerodynamics, 188, pp.19~29 (2019)
- Bordogna, G., "The effects of the aerodynamic interaction on the performance of two flettner rotors", Journal of Wind Engineering and Industrial Aerodynamics, 196, pp.104024~ (2020)
- Magnus effect In the case of rotating cylinders and shell, "Buford, W. E.", MEMORANDUM, ~, pp.MEMORANDUM Report No. 821 (1954)
- Enercon Wind Company, "Enercon E-ship 1 wind hybrid commercial cargo ship", 4th Conference on Ship Efficiency (2013)
- 김정은, "선박용 로터세일 주위의 난류 유동특성에 관한 수치해석적 연구", 해양환경안전학회지, 28(4), pp.648~656 (2022), 해양환경안전학회[DOI]
- 권창섭, "A parametric study for a flettner rotor in standalone condition using CFD", International Journal of Naval Architecture and Ocean Engineering, 14, pp.1~11 (2022), 대한조선학회[DOI]
- Muto, M., "Negative magnus effect on a rotating sphere at around the critical Reynolds number", Journal of Physics : Conference Series, 318, pp.032021~ (2011)
- Park, H. S., "International Maritime Organization(IMO), 40% greenhouse gas by 2030Reduction target, new propulsion fuel(fossil fuel-OUT)means development and use", KMI trend analysis Report, 137 (2019)
- Peter, N., "The magnus effect and flettner rotor: potential application for future oceanic shipping", Journal of Pacific Studies, 36(2), pp.161~182 (2016)