Characteristics of Vortex Chamber Oscillation Device

抄録

Fluidic watering device has been developed, to which self-oscillaitng phenomena are applied, and which has a very simple structure. This device is named vortex chamber oscillation device. The jet is controlled only by a circular vortex chamber, and self-oscillation occurs due to a pressure difference between the left and right parts of the vortex chamber. By the momentum balance of main jet, the critical pressure difference to switch the jet left and right is calculated. By the difference between the masses of air flowing into the chamber through an air hole and air flowing out accompanying the jet, the time required for reaching the critical pressure is calculated, and the oscillation frequency is determined. This watering device gives appropriate size of water drops and uniform water distribution. This device was successfully used for the Shinkansen to melt snow on the track and the roofs of stations.