Adiabatic positive displacement machinery

Details Adiabatic positive displacement machinery Adiabatic positive displacement machinery

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F01K 27/00 (2006.01) F02B 29/00 (2006.01) F02B 31/00 (2006.01) F02B 77/11 (2006.01) F25B 9/00 (2006.01) F02B 1/04 (2006.01) F02B 3/06 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1204290

-72- Adiabatic Positive Displacement Machinery Abstract Adiabatic positive displacement gas cycle machin- ery 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 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 posi- tive displacement machinery is imperfect control of heat flow.

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