A Numerical Study on the Characteristics of a Thick Flapped Rudder depending on Various Geometric Parameters using Computational Fluid Dynamics Technique
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초록
A marine flapped rudder is designed to improve the effective lift generated by the rudder; this also improves the maneuverability of the ship. The flap is a high lift device installed at the trailing edge of the rudder to augment lift. In this paper, the characteristics of a thick flapped rudder are analyzed at a low Reynolds number with various ratios of flap chord length to total chord length and various aspect ratios, based on the computational fluid dynamics technique. The performance of the rudder with respect to lift, drag, and center of pressure are investigated, and the efficient ratio of flap chord length to total chord length and improved aspect ratio are determined. Ed: highlight – or ‘superior’. As a case study, the flow on the flapped rudder of an NACA0021 section shape in free stream condition is simulated. The standard k-epsilon turbulence model is used to model the flow around the flapped rudder. The results indicate that the efficient ratio of the flap chord length to total chord length and aspect ratio are 0.3 and 1.4, respectively.
Abstract
A marine flapped rudder is designed to improve the effective lift generated by the rudder; this also improves the maneuverability of the ship. The flap is a high lift device installed at the trailing edge of the rudder to augment lift. In this paper, the characteristics of a thick flapped rudder are analyzed at a low Reynolds number with various ratios of flap chord length to total chord length and various aspect ratios, based on the computational fluid dynamics technique. The performance of the rudder with respect to lift, drag, and center of pressure are investigated, and the efficient ratio of flap chord length to total chord length and improved aspect ratio are determined. Ed: highlight – or ‘superior’. As a case study, the flow on the flapped rudder of an NACA0021 section shape in free stream condition is simulated. The standard k-epsilon turbulence model is used to model the flow around the flapped rudder. The results indicate that the efficient ratio of the flap chord length to total chord length and aspect ratio are 0.3 and 1.4, respectively.
참고문헌 (7)
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- Molland, A. F., "Marine Rudders and Control Surfaces" (2007), Elsevier Ltd Publisher
- 서대원, "콴다효과를 이용한 전 가동 타의 양력성능 개선에 관한 연구", 대한조선학회 논문집, 50(1), pp.25~32 (2013), 대한조선학회
- Shigunov, V., "Criteria for minimum powering and maneuverability in adverse weather conditions", Journal of Ship Technology Research, 62, pp.140~147 (2015)
- Thua, N. T., "Effect of Flap on Hydrodynamic Characteristics of Rudder based on Computational Fluid Dynamics Analysis", Proceedings of The 8th Asia-Pacific Workshop on Marine Hydrodynamics, pp.187~192 (2016)