Agitating – Stationary deflector in flow-through mixing chamber
Patent
1994-06-30
1996-05-28
Cooley, Charles E.
Agitating
Stationary deflector in flow-through mixing chamber
181213, B01F 500
Patent
active
055204597
ABSTRACT:
A shear layer of a fluid flow has relatively large vortical structures generated by acoustic forcing from oscillations induced in a cavity closely adjacent to the flow so that these structures enhance mixing at the layer. The forcing frequency is selected by varying the dimensions of the cavity, and several cavities of different dimensions may be provided for forcing at different frequencies, including beat frequencies. The cavity provides passive, high amplitude forcing effective with a compressible shear layer due to high speed flow, including supersonic flow. Cavities of differing configuration provide forcing for fluid flow from nozzles of different geometries. The most effective enhancement is provided by particular excitation frequencies generated by a cavity having a size selected in accordance with dimensionless relations between the flow parameters and nozzle geometry.
REFERENCES:
patent: H1007 (1992-01-01), Schadow et al.
patent: 3671208 (1972-06-01), Medsker
patent: 4100993 (1978-07-01), Feder
K. Yu, E. Gutmark and K. Schadow; "Passive Control of Coherent Vortices in ompressible Mixing Layers"; American Institute of Aeronautics and Astronautics, Washington, D.C.; paper 93-3262 Jul. 6, 1993.
K. Yu, E. Gutmark, R. Smith and K. Schadow; "Supersonic Jet Excitation Using Cavity-Actuated Forcing"; American Institude of Aeronautics and Astronautics, Washington, D.C.; paper 94-0185, Jan. 10, 1994.
K. Yu and K. Schadow; "Cavity-Actuated Supersonic Mixing and Combustion Control"; to be presented at the 25th International Symposium on Combustion; Jul. 31, 1994 and to appear in Combustion & Flame (1994).
Schadow Klaus C.
Smith Robert A.
Yu Kenneth H.
Church Stephen J.
Cooley Charles E.
Forrest John
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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