Adiabatic positive displacement machinery

Details Adiabatic positive displacement machinery Adiabatic positive displacement machinery

1985-01-02

1987-05-12

Hart, Douglas

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

Fluid motor means is expansible chamber type with movable...

91 50, 91188, 91457, 123 70V, 123 81C, 123308, 123559, 417457, 417490, 417542, F02B 3700, F01L 1502, F01L 702, F04B 3910

Patent

active

046639381

ABSTRACT:
Adiabatic positive displacement gas cycle machinery is designed with explicit control of the heat flow between the gas and the walls. The control is achieved by maintaining near-laminar flow and a small wall area to volume ratio. The most stable near-laminar flow in a cylinder is an axial vortex because of symmetry, and hence the induction port design should establish an axial vortex and a low velocity. Induction and exhaust port designs to achieve this flow are applied to a vane pump, an adiabatic air compressor, a diesel engine, and two and four stroke Otto cycle engines. The gain in thermal efficiency for these designs can be significant, up to a factor of 2, since the largest inefficiency in nearly all positive displacement machinery is imperfect control of heat flow.

REFERENCES:
patent: 1662597 (1928-03-01), Baldwin
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patent: 2044522 (1936-06-01), Wurtele
patent: 2054963 (1936-09-01), Atteslander
patent: 2239922 (1941-04-01), Martinka
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patent: 2309968 (1943-02-01), Marburg
patent: 3267661 (1966-08-01), Petrie
patent: 3362391 (1968-01-01), Lindsay
patent: 4138931 (1979-02-01), Hermann
Judge, A. W. High Speed Diesel Engines, pp. 126, 127, 1957.
Annand et al., Gas Flow in the Internal Combustion Engine, p. 13, 1974.

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