초록 ▼

The fluidic oscillator consists of a resonant fluid circuit having a fluid inertance and a dynamic fluid compliance. The inertance is a conduit interconnecting two locations of a chamber on each side of a working fluid jet issuing into one end of the chamber, the inertance conduit serving to transfe

The fluidic oscillator consists of a resonant fluid circuit having a fluid inertance and a dynamic fluid compliance. The inertance is a conduit interconnecting two locations of a chamber on each side of a working fluid jet issuing into one end of the chamber, the inertance conduit serving to transfer working fluid between the two locations. Through one or more output orifices located approximately at the opposite end of the chamber, the fluid exits from a chamber exit region which is shaped to facilitate formation of a vortex (the dynamic compliance) from the entering fluid. The flow pattern in the chamber and particularly the vortex in the chamber exit region provide flow aspiration on one side and surplus of flow on the opposite side of the chamber, which effects accelerate and respectively decelerate the fluid in the inertance conduit such as to cause reversal of the vortex after a time delay given by the inertance. The vortex in the chamber exit region will thus cyclically alternate in the velocity and direction of rotation to direct outflow through the output orifice such as to produce a cyclically repetitive side-to-side sweeping stream our spray pattern whose direction is determined, at any instant in time, as a function of the vectorial sum, at the output orifice, of the tangential vortex flow spin velocity vector and the static pressure vector as well as the dynamic pressure component, both directed radially from the vortex. By changing these parameters by suitable design measures and operating conditions and by appropriately configuring the oscillator, sweep angle, oscillation frequency, distribution, outflow velocity, break up into droplets, etc. can be readily controlled over large ranges.

대표청구항 ▼

A fluidic spray device comprising: a chamber having sidewalls forming an upstream end and a downstream end thereof; fluid inlet means; inlet means for issuing a jet of working fluid into aid chamber; said sidewalls in the upstream end of said chamber converging toward said jet and substantially

A fluidic spray device comprising: a chamber having sidewalls forming an upstream end and a downstream end thereof; fluid inlet means; inlet means for issuing a jet of working fluid into aid chamber; said sidewalls in the upstream end of said chamber converging toward said jet and substantially spaced therefrom; said inertance means including an inertance flow conduit having an entry portion thereof entering directly into said upstream end of said chamber so that working fluid from said inertance means enters directly into said upstream end of said chamber at a location substantially spaced from said jet; outlet means for issuing working fluid from said chamber in a flow pattern and direction determined by the static pressure and flow velocity of working fluid in said chamber; dynamic compliance means including sidewalls which converge toward said outlet opening and near said outlet opening for establishing a vortical flow of the working flow issued into said chamber; and fluid inertance means for cyclically reversing said vortical flow between first and second flow directions, said fluid inertance means interconnecting first and second locations in said chamber on opposite sides of said jet proximate said inlet means such that vortical flow in said first flow direction aspirates fluid from said fluid inertance means at said first location and feeds fluid into said fluid inertance means at said second location, and such that vortical flow in said second direction aspirates fluid from said fluid inertance means at said second locations and feeds fluid into said fluid inertance means at said first location, said fluid inertance means including means establishing a flow inertia for delaying changes in flow conditions through said fluid inertance means in response to differential pressure changes across said first and second locations.