Design And Fabrication Of High-speed Composite Energy Storage Flywheel

The energy issue is one of the major projects in the world.While continuously developing new energy sources,in order to use existing energy more efficiently,it is necessary to develop advanced energy-saving and energy storage technologies.As an efficient and convenient way of storing energy,flywheel energy storage has been widely used in varied fields.In recent years,the use of carbon fiber composite materials to produce highspeed energy storage flywheel has become a major research trend.However,there is still no breakthrough in the domestic design and fabrication of highspeed composite energy storage flywheel,and there are still major restrictions on the increasing flywheel speed and storage energy density.In order to improve the energy storage density,this paper systematically studied the design and preparation technology of composite high-speed energy storage flywheel,and achieved the following main results:(1)Static analytical model of energy storage flywheelCommon composite rotors are primarily single-ring rotors with a circumferential winding of fibers or multi-ring rotors with multi-ring interference fits.The stress state of the carbon fiber composite rotors of these two structures under high-speed rotation was analyzed and analyzed,and the static model of the energy storage flywheel rotor has been established.(2)Optimization design of energy storage density of flywheel rotorFor the two-structure carbon fiber composite rotor,a mathematical model of the corresponding energy storage density optimization is established based on the static analytical model.The finite element analysis is used to analyze the influence of the geometric shape of the flywheel rotor and the process parameters on its stress state,so as to summarize the general structure optimization process.At the same time,combined with the particle swarm optimization algorithm,the storage density of the composite rotor is finally completed by MATLAB programming.Finally,the energy storage density of the optimized flywheel rotor increased by more than 20%.(3)Finite element analysis of high-speed energy storage flywheelThe ANSYS Workbench finite element analysis software is used as a platform to simulate and verify the designed flywheel rotor,including the static and dynamic characteristics of the rotor.Statics analytical simulation,consists of three steps,would simulate the whole assembly process of the flywheel rotor.The dynamics analysis is mainly for the modal analysis of the rotor.The simulation results show that the static and dynamic performance of the optimized flywheel rotor meet the structural and design requirements.(4)Fabrication process of composite high-speed energy storage flywheelAccording to the basic characteristics and molding process of carbon fiber reinforced resin matrix composites,the molding process of composite wheel rings has been designed and completed,including the selection of raw materials,preparation of prepreg,mold design and winding forming process,and the forming process of the composite wheel ring and the metal hub.