Novel inertance loop construction for air sweep fluidic oscillator

DETAILED DESCRIPTION OF THE INVENTION In general, fluidic oscillators according to the invention have an interaction region having an upstream end and a downstream end with a power nozzle for projecting a jet of air into the interaction region.
First and second spaced apart control ports at each side of the upstream end of the interaction region and at each side of the jet of air projected into the interaction region by the power nozzle are connected together by a continuous inertance loop with the inertance loop being substantially coplanar with the oscillator end including a substantially flat or thin loop section or portion thereof extending transversely to the direction of air flow and preferably in the throat of the power nozzle.
Substantial coplanarity of the inertance loop with the rest of the fluidic oscillator permits avoidance of molding and fabrication assembly problems, and achieves lower manufacturing costs.
In the preferred embodiment the cross-sectional area of the power nozzle is enlarged to permit air flow therewith without pressure loss due to passage of the loop section through the power nozzle throat.
Referring now to FIG.
1, the dashboard or instrument panel 10 of an automobile is adjacent the windscreen 11 and steering wheel 12 is on the driver's side and a gear shift 13 is positioned for convenient use by the driver.
An air distributing plenum 14 receives windshield clearing air (for either defrosting and/or defogging) from the heat exchanger (not shown) and delivery to the windshield depending upon the position of a control (not shown) in a position to be easily operable and accessible by the driver and/or passenger, all of which is conventional and form no part of the present invention other than being a controlled source of defrost/defog air under pressure.
The abuting or mating edges E of each molded oscillator half is formed to be self-coupling and sealing whereby the edges are generally double "U" shaped with the legs of the "U" slightly inwardly inclined so that when the upper "U" portion of mold part is nested in the bottom "U", the spring in the legs of the outer "U" retain the two molded halves in assembly