US Patent:
20030209006, Nov 13, 2003
Inventors:
Mory Gharib - Pasadena CA, US
Paul Krueger - Pasadena CA, US
Assignee:
California Institute of Technology
International Classification:
F02K007/02
Abstract:
A pump augmentation uses a nozzle output which is controlled in pulses to produce vortex rings and is controlled such that where m=the total mass of fluid emitted during a single pulse of duration t, =the average density of the fluid emitted in the pulse. A=the cross-section area of the nozzle orifice (= /4Dfor a circular nozzle), D=the primary dimension of the nozzle orifice (=the exit diameter of the nozzle for circular nozzles), t=pulse duration, and U=average velocity of the fluid at the nozzle exit during one pulse (during t).