Abstract
Fluidic Watering device was developed, to which self-oscillating phenomena are applied, and which has very simple structure. This device was named vortex chamber oscillation device. The jet is controlled only by a circular vortex chamber, and self-oscillation occurs by the pressure difference of 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 was calculated. By the difference of the mass of air flow into the chamber through an air hole and flow out accompaning the jet, the time required for reaching the critical pressure was calculated, and the oscillation frequency was determined. This watering device attains appropriate size of water drops and uniform water distribution. This device was used for the SHINKANSEN to melt the snow on the tracks and the roofs of stations, and good results were obtained.
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