Importance

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Abstract

A defrost/defog air supply system for issuing a sweeping jet of air upon a windshield or other surface to be defrosted or defogged comprises a fluidic oscillator having a power nozzle coupled to receive the defrost/defog air and an outlet for issuing a sweeping stream of defrost/defog air onto the surface. The fluidic oscillator is short in length (in the preferred embodiment the distance from the power nozzle to the end of the outlet is less than twice the width of the power nozzle) and has a pair of control ports immediately adjacent the downstream side of the power nozzle of the fluidic and a continuous inertance loop interconnecting the control ports with the continuous inertance loop being of a length and cross-section such as to maintain the frequency of oscillation below about 12 Hz to thereby avoid mixing with ambient air prior to impingement upon the surface to be defrost. The downstream edges of the control ports are set back to permit ambient air to enter the control port when the defrost-defog air issuing from the nozzle is at the opposite sides. Flow straighteners are provided upstream of the power nozzle and just as the air exits from the manifold or supply to assure uniform and symmetrical flow velocity profile in the power nozzle. Sweep angle enhancers are provided at the outlet so that very short diverging sidewalls reduce the amount of underdash space required.

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First Claim