Reverse vane engine extracting work from hot gas entering an engine at an ambient pressure

A reverse vane engine operable via a gas comprising:

• a housing with an outer wall;
• a rotor, said rotor having a center, said rotor rotating relative to said housing about said center;
• and
• a cavity defined by a first vane, a second vane, said rotor and said outer wall, said first vane and said second vane being supported by said rotor wherein said first vane and said second vane move relative to said outer wall,
• wherein said cavity moves through an inlet region with an inlet, a chill region wherein said gas within said cavity cools resulting in a reduction of a cavity pressure in said chill region, and a work region with a work region start and a work region end, said work region having an end exhaust port at said work region end and an intermediate exhaust port between said work region start and said work region end as determined by a rotational direction of travel of said cavity, said intermediate exhaust port removably receiving an intermediate plug, said intermediate plug being biased to a closed position, wherein, when said cavity reaches said intermediate exhaust port, said intermediate plug opens when said cavity pressure exceeds an ambient pressure outside of said housing to allow at least some of said gas to exit through said intermediate exhaust port,
• wherein work is performed within said work region as said first vane has a shorter length than said second vane as said outer wall has a decreasing radius within said work region.

A reverse vane engine operable via a gas comprising:

• a housing with an outer wall;
• a rotor, said rotor having a center, said rotor rotating relative to said housing about said center;
• and
• a cavity defined by a first vane and a second vane, said rotor and said outer wall, said first vane and said second vane being supported by said rotor wherein said first vane and said second vane move relative to said outer wall,
• wherein said cavity moves through an inlet region with an inlet, a chill region wherein said gas within said cavity cools resulting in a reduction of a cavity pressure in said chill region, and a work region wherein said outer wall has a decreasing radius relative to said center of said rotor, said work region having a work region start and a work region end as determined by a rotational direction of travel of said cavity, said work region radially having at least two exhaust ports each with a plug operably associated therewith, each of said plug operably associated therewith opening when said cavity pressure exceeds an ambient pressure outside of said housing and remaining closed when said cavity pressure is less than said ambient pressure when said cavity respectively passes each of said at least two exhaust ports,
• wherein said reverse engine has an effective work region that is variable in length defined radially starting at said work region start and terminating at the first one of said at least two exhaust ports wherein said plug operably associated therewith is open, and
• wherein work is performed within said work region as said first vane has a shorter length than said second vane as said outer wall has said decreasing radius within said work region.