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Performance Improvement by Control of wingtip Vortices for Vertical Axis Type Wind Turbine

Open Journal of Fluid Dynamics 2018年第3期8卷 331-342页

作者： Shigeru Ogawa Yusuke Kimura Department of Mechanical Engineering National Institute of Kure College Kure Japan

The present paper describes control of wingtip vortices generated by vertical type wind turbine. The wind turbine consists of three circular cylinders. Each cylinder rotates on its own vertical axis and moves in orbit. It is known that wingtip vortices give rise to decrease of power generation performance as well as aerodynamic noise. Therefore, the goal of the study is to control wingtip vortices and to improve power generation performance. Numerical study was conducted for 14 models to find out control factors to suppress wingtip vortices. Numerical simulation visualized wingtips by streamlines as well as pressure distribution on the circular cylinder for evaluating Magnus effect. As a result, the following findings were obtained: 1) Installation of fully covered protection plates at both ends of the circular cylinder blades is greatly effective to suppress the wingtip vortices. 2) Curved wings attached to each cylinder are more effective to enhance power generation efficiency than flat ones, due to great increase in Magnus effect caused by large pressure difference on both sides of the curved wing. The power efficiency of the optimized model was improved up to 2.8%, which means 11 times that of the original model.

关键词： Vertical Axis Type Wind Turbine wingtip Vortex Magnus Effect

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The Swirling Jet Generation Method and Its Effect on the Velocity Distribution

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Journal of Mechanics Engineering and Automation 2020年第1期10卷 16-26页

作者： Fernández Roque Tiburcio Correa Arredondo JoséArturo Mejía Carmona Alejandro Sandoval Lezama Jorge Vázquez Flores JoséFélix Tiburcio Fernández Roque Instituto Politécnico Nacional Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad TicomanAv.Ticoman No.600Col.San JoséTicomanAlcaldía Gustavo A.MaderoC.P.07340 México DFMéxico 不详

The wing tip vortex has a great similarity with the swirling jets.Since these are generated of a simpler and more economic form in a laboratory,it is relevant to determine which the best method is for the generation of the swirling jet.In this paper,the velocity distribution obtained experimentally with the method of generation here proposed,which consists of the employment of an axial fan without stators,is compared with the velocity distribution of swirling jets generated with three different methods.It is observed that the velocity distribution obtained with the proposed method is similar with one of the methods found in the references,which uses fixed blades guides at the entry of the pipe.The proposed method is suitable for the generation of the swirling jet and it is considered that it is simpler and more economic to use blades fixed guides.

关键词： Swirling jet velocity distribution swirl intensity wingtip vortex tangential velocity

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