Abstract: Self-contained treatment apparatus for a body of water includes a mounting assembly having flotation elements for fixedly supporting a circulation or agitation device below the surface of the water and driving or motor mechanism above the water surface. Actuation of the motor mechanism operates the circulation or agitation device such that naturally occurring oxygen-saturated water near the surface is drawn downwardly and mixed with the lower oxygen deficient reaches of the body of water and effecting a net increase in dissolved oxygen content. Optionally, actuation of the motor mechanism operates a bubble generator adjacent the water surface so that the air bubbles generated are drawn down with the oxygen-saturated surface water, where oxygen from the bubbles dissolves into the surrounding oxygen-deficient water, thus accelerating the improvement in dissolved oxygen content.

Abstract: The invention is an energy-saving means for providing turbulence as well as circulation to liquids in a controlled natural purification system for advanced waste water treatment and algae farming. The wind-powered impeller-mixers are used in the algae growing reactors of a controlled natural purification system. The invention consists of a vertical vane type windmill that turns an impeller blade to cause turbulence in waste water being treated. The impeller blade may be geared to operate from a horizontal position to a vertical position to provide circulation movement. A motor-generator hook-up is combined with windmill-impeller system so that generated energy may be stored for use in turning the impeller blade when there is no wind or not enough wind to operate the system. A clutch arrangement is used to disengage the impeller when the algae growing reactor is to be drained.

Abstract: A bistable fluidic amplifier having high gain is disclosed. Power fluid is upplied through an inlet port and lobe-shaped feedback cavities downstream provide an oscillating differential pressure or flow between a pair of outlets. A pair of opposed control ports are provided between the inlet port and the feedback cavities and a differential control pressure or flow applied to the control ports creates a differential outlet pressure or flow having a gain in the range of 10-15.

Abstract: A fluidic angle-of-attack sensor for providing a differential output propional to the angle-of-attack of flow impinging on the sensor. An excitation flow nozzle discharges into a coanda-effect cavity which opens into a centrally oriented impingement cavity so that excitation flow penetrates and impinges on the ambient flow field. A pair of output ports alternately intercept part of the excitation stream to provide a differential output pressure. When the sensor is pointed across the flow field, the flow field augments the coanda effect in bending the stream one way while opposing it in bending it the other way to provide a differential output pressure proportional to angle-of-attack.