Method and apparatus for controlling the mixing of two fluids
AssigneeRemot University Authority for Applied Research & Industrial Develop. Ltd.
InventorsIsrael Wygnanski, Heinrich Fiedler
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Abstract
A method and apparatus are described for controlling the mixing of two fluids in which an active element is driven to induce, in the vicinity of the beginning of the mixing region, oscillations of the two fluids about an axis substantially normal to the mixing region flow axis. The active element may be driven by an external drive, or by the kinetic energy in the fluids. Several applications of the invention are described including promoting combustion in jet engines, suppressing audible jet noise, and increasing the output of ejector pumps or thrust augmentors.
Claims21
A method of controlling the mixing of two fluids of the same state or of substantially the same state in a mixing region having a flow axis, in which method at least one of the fluids is directed to flow into direct contact with the other fluid at the beginning of the mixing region;
- characterized in that an active element is driven to induce, in the vicinity of the beginning of the mixing region, oscillations of the two fluids about an axis substantially normal to said mixing region flow axis so as to produce, at the boundaries of said mixing region, small flow fluctuations substantially perpendicular to the flow axis.
Apparatus for controlling the mixing of two fluids of the same state or substantially the same state in a mixing region having a flow axis, which apparatus includes means for directing at least one of the fluids to flow into direct contact with the other fluid at the beginning of the mixing region;
- characterized in that the apparatus includes an active element and means for driving same to induce, in the vicinity of the beginning of the mixing region, oscillations of the two fluids about an axis substantially normal to said mixing region flow axis so as to produce at the boundaries of said mixing region, small flow fluctuations substantially perpendicular to the flow axis.
Dependencies are inferred from the claim text.