Abstract
In this paper, the newly system that is decrease aerodynamic drag for supersonic flywheel at atmosphere is described. We produced flywheel energy storage system, using a CFRP composite flywheel and a newly designed motor/generator. This system be able to keep the rotation speed that circumferential velocity is supersonic, due to their high tip speed, the flywheel must operated in the specific shroud with regard to rotor aerodynamic drag. The present time, their operate in vacuum container as a example of the specific shroud, but the drag is decreased, temperature of the motor and the bearings with flywheel is increased. Therefore we take doing to study for aerodynamics that we put a newly theory on the practice them. We find a method that flywheel ring is operated in correspond number of the floating shrouds to the maximum rotor speed, and the temperature of system is easy to eliminate at atmosphere. I make a try to take analogical reasoning on electric circuit.
