Power plants – Motor operated by expansion and/or contraction of a unit of...
Reexamination Certificate
2011-03-22
2011-03-22
Nguyen, Hoang M (Department: 3748)
Power plants
Motor operated by expansion and/or contraction of a unit of...
C060S517000, C060S522000, C060S523000, C060S524000
Reexamination Certificate
active
07908855
ABSTRACT:
The invention relates to fluidic oscillators including compressed gas driven pumps and liquid piston and thermoacoustic heat engines and heat pumps in which the intention is to generate large amplitude oscillations by eliminating the dependence of the oscillations on inertia. According to the principle embodiment represented by circuit200pressure or temperature variations27′ drive pressure variations in vessel11′ causing a flow of further working fluid between vessel11′ and load12′ wherein useful work is consumed. Said flow varies out of phase with said pressure variations in vessel11′ by a first phase angle determined by inter alia the dissipative load12′ and the capacity of vessel11′. Oscillations are sustained due to a second phase angle determined by inter alia subcircuit13′ comprising dissipative processes260, 262and capacitive processes261, 263wherein each said dissipative process comprises any one, or combination of the following: viscous drag, thermal resistance or mechanical friction and each capacitive process comprises any one, or combination of the following: hydrostatic pressure change due to a flow, fluid compressibility, thermal capacitance, or elasticity; and wherein, the magnitude of the pressure changes in the working fluid increases or remains constant with time due to at least one mechanism giving rise to a gain.
REFERENCES:
patent: 3574475 (1971-04-01), Wolff
patent: 3765182 (1973-10-01), Warren
patent: 27 56 585 (1979-06-01), None
patent: 2 518 184 (1983-06-01), None
patent: 2 017 227 (1979-10-01), None
International Search Report for corresponding PCT/GB2005/002278, completed Aug. 30, 2005 by L. Kolby of the EPO.
Nguyen Hoang M
Thermofluidics Ltd.
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