Wavy 형상 적용에 따른 대 각도에서의 러더 성능에 대한 수치해석 연구
A Numerical Performance Study on Rudder with Wavy Configuration at High Angles of Attack
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참고문헌
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초록
This study deals with numerically comparing performance according to rudder shape called 'Twisted rudder and Wavy twisted rudder'. In comparison with conventional rudder, rudder with wavy shape has showed a better performance at high angles of attack(∘~∘ ) due to delaying stall. But most of study concerned with wavy shape had been performed in uniform flow condition. In order to identify the characteristics behind a rotating propeller, the present study numerically carries out an analysis of resistance and self-propulsion for KCS with twisted rudder and wavy twisted rudder. The turbulence closure model, Realizable , is employed to simulate three-dimensional unsteady incompressible viscous turbulent and separation flow around the rudder. The simulation of self-propulsion analysis is performed in two step, because of finding optimization case of wavy shape. The first step presents there are little difference between twisted rudder and case of H_0.65 wavy twisted rudder in delivered power. So two kind of rudders are employed from first step to compare lift-to-drag ratio and torque at high angles of attack. Consequently, the wavy twisted rudder is presented as a possible way of delaying stall, allowing a rudder to have a better performance containing superior lift-to-drag ratio and torque than twisted rudder at high angles of attack. Also, as we indicate the flow visualization, check the quantity of separation flow around the rudder.
Abstract
This study deals with numerically comparing performance according to rudder shape called 'Twisted rudder and Wavy twisted rudder'. In comparison with conventional rudder, rudder with wavy shape has showed a better performance at high angles of attack(∘~∘ ) due to delaying stall. But most of study concerned with wavy shape had been performed in uniform flow condition. In order to identify the characteristics behind a rotating propeller, the present study numerically carries out an analysis of resistance and self-propulsion for KCS with twisted rudder and wavy twisted rudder. The turbulence closure model, Realizable , is employed to simulate three-dimensional unsteady incompressible viscous turbulent and separation flow around the rudder. The simulation of self-propulsion analysis is performed in two step, because of finding optimization case of wavy shape. The first step presents there are little difference between twisted rudder and case of H_0.65 wavy twisted rudder in delivered power. So two kind of rudders are employed from first step to compare lift-to-drag ratio and torque at high angles of attack. Consequently, the wavy twisted rudder is presented as a possible way of delaying stall, allowing a rudder to have a better performance containing superior lift-to-drag ratio and torque than twisted rudder at high angles of attack. Also, as we indicate the flow visualization, check the quantity of separation flow around the rudder.
참고문헌 (5)
- Anh, H.P., "Effect of waviness on the conventional rudder performance", Proceedings of the Annual Autumn Meeting, pp.880~886 (2009), SNAK
- Kyoungsoo Ahn, "Hydrodynamic characteristics of X-Twisted rudder for large container carriers", International Journal of Naval Architecture and Ocean Engineering, 4(3), pp.322~334 (2012), 대한조선학회
- 김인환, "대형 컨테이너선용 Twist 일체형 타 개발", 대한조선학회 논문집, 46(5), pp.479~487 (2009), 대한조선학회
- 이원준, "대형 컨테이너선용 고양력 웨이브형 트위스트 타 개발", 석사, 조선해양공학, pp.2011
- Yoon, H.S, "Effect of the wavy leading edge on hydrodynamic characteristics for flow around low aspect ratio wing", Computers & Fluids, 49, pp.276~289 (2011)