Study On The Characteristics Of Marine Current Machine With Co-horizontal Axis Based On Magnus Effect

Marine current energy refers to the kinetic energy of seawater movement,the seawater movement is regular,and the seawater flow rate is stable.The reserves of marine current energy is rich,which have great potential for exploitation.Research on energy acquisition devices and their performance is not only the hot but also the difficulty,especially to improve the current technology of marine current turbines to make full use of low flow current.The research of horizontal axial marine current turbine with single-impeller has been relatively mature,the advantage is that the high effectiveness can be achieved under the commercial flow rate,but the turbines of Magnus effect can be applied under lower flow conditions.It is of great significance to develop turbines with Magnus effects to make full use of lower velocity marine currents.The energy acquisition devices of marine current machine with co-horizontal axis based on Magnus effect consists of two parts,namely the upstream variable cross-section bending blade with blunt trailing edge impeller and the downstream Magnus cylindrical blade impeller.Some factors are the key to the operational performance of the patented "A kind of marine current power generation device based on Magnus effect",including the hydrodynamic characteristics of the Magnus impeller under the action of the marine current and the rotational angular velocity around the shaft of the Magnus cylindrical,and some important theoretical problems that related to this kind of marine current machine need to be studied and discussed in depth.In this paper,the hydrodynamic characteristics of the marine current machine with co-horizontal axis based on Magnus effect are studied by means of theoretical analysis and numerical simulation.Firstly,the design and optimization of the variable cross-section bending blades with blunt trailing edge are carried out based on the BEM theory,the hydrodynamic characteristics of the optimized blades are obtained by CFD and theory analysis.Secondly,the cylindrical force and the energy acquisition characteristics of the Magnus cylinder are obtained by simulation analysis.Then,the variable cross-section bending blade and Magnus cylinder are combined to form a marine current machine with co-horizontal axial based on the Magnus effect.Through the comparative analysis after Fluent simulation,the optimal performance structure is obtained.The force characteristics of the upstream and downstream blades in the marine current machine with co-horizontal axis are studied.The main factors affecting the hydrodynamic characteristics of the marine current machine with co-horizontal axis based on Magnus effect are analyzed,and the parameters are optimized.This paper provides a basis for the application of the marine current machine with co-horizontal axis based on Magnus effect in ocean current power generation engineering,and provides a certain method for the dynamic analysis and numerical simulation of the interaction between Magnus blades and Marine current machine.All those provide a certain guiding significance for the optimization design of the new type of marine current machine.