Abstract
The author introduces a new oscillation phenomenon in which a three-dimensional rectangular jet oscillates periodically when it is issued from a rectangular nozzle with a height lower than that of the flow passage into an abruptly expanded flow passage. In this paper, a new fluidic oscillator or flowmeter without control port or feedback loop is proposed by utilizing the phenomenon mentioned above. Also, this paper clarifies the various conditions for the oscillation to occur, the relation between the oscillation frequency and various conditions such as dimensions of nozzle and flow passage or jet velocity for a trial model of the above-mentioned fluidic oscillator, and the mechanisms for oscillation and determination of oscillation frequency. The effect of nozzle shape on this oscillation phenomenon is also clarified by using both rectangular-and round-shaped nozzles.
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