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A fluid working apparatus (130) includes a housing structure (130) with an inlet (132), an outlet (133), an outer housing member (134) defining a tubular portion with an inner surface and an inner housing member (138) within the outer housing member (130) and having an outer surface spaced from the

A fluid working apparatus (130) includes a housing structure (130) with an inlet (132), an outlet (133), an outer housing member (134) defining a tubular portion with an inner surface and an inner housing member (138) within the outer housing member (130) and having an outer surface spaced from the inner surface such that a working flow chamber (141) is defined between the radially inner most portions of the outer and inner surfaces and a return chamber (140) is defined between the radially outer most portions of the outer and inner surfaces. A working assembly is positioned in the housing with a rotor (114) thereof rotatably supported in the housing structure (130) and extending into the working flow chamber (141). At least one return assembly (140, 142) is positioned within the tubular portion and configured to return fluid flow from an outlet side to an inlet side of the working assembly (141). A method of defining a re-circulating working fluid apparatus is also provided.

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1. A fluid working apparatus, comprising: a housing structure with a housing inlet and a housing outlet, the housing structure including an outer housing member defining a circumferential tubular portion with an inner surface, and an inner housing member positioned within the outer housing member an

1. A fluid working apparatus, comprising: a housing structure with a housing inlet and a housing outlet, the housing structure including an outer housing member defining a circumferential tubular portion with an inner surface, and an inner housing member positioned within the outer housing member and having an outer surface spaced from the inner surface such that a working flow chamber is defined between the radially inner most portions of outer surface and the inner surface;a working assembly having an inlet side and an outlet side with at least one rotor having a plurality of blades directly coupled to a hub so as to be positioned between the inlet and outlet sides, the working assembly positioned in the housing structure such that the rotor is rotatably supported therein with the rotor blades extending into the working flow chamber; andat least one single return chamber positioned within the tubular portion and configured to return fluid flow from the outlet side of the working assembly to the inlet side of the working assembly, whereby all of a working fluid flows through (a) the housing inlet in a direction towards a first circumferential portion of a circumferential inlet area defined between the housing structure and the inlet side of the working assembly,(b) the first circumferential portion of the circumferential inlet area in a direction towards the outlet side of the working assembly while workingly engaging a first subset of the plurality of blades,(c) a first circumferential portion of a circumferential outlet area defined between the housing structure and the outlet side of the working assembly,(d) the single return chamber in a direction towards a second circumferential portion of the circumferential inlet area,(e) the second circumferential portion of the circumferential inlet area in a direction towards the outlet side of the working assembly while exclusively workingly engaging a second subset of the plurality of blades, and(f) the housing outlet. 2. The fluid working apparatus according to claim 1, wherein the working assembly further includes at least one stator positioned adjacent to the at least one rotor. 3. The fluid working apparatus according to claim 1, wherein the working assembly includes two or more rotors. 4. The fluid working apparatus according to claim 1, wherein the at least one single return chamber is defined by boundary vanes extending radially in the return chamber between the inner and outer housing members with each adjacent pair of boundary vanes defining a return zone therebetween, with each return zone having a respective circumferential width. 5. The fluid working apparatus according to claim 4, wherein one or more of the return zones includes guide vanes extending radially between the inner and outer housing members, the guide vanes guiding fluid flow through a given return zone but not defining the boundaries of the return zone. 6. The fluid working apparatus according to claim 4, comprising 1 to N return zones, wherein N is an integer equal to one or more, such that the working fluid passes from the inlet side to the outlet side at least N+1 times and thereby workingly engages at least N+1 subsets of the plurality of blades before passing out of the housing outlet. 7. The fluid working apparatus according to claim 6, wherein the circumferential width of each return zone is equal. 8. The fluid working apparatus according to claim 6, wherein the circumferential width of at least one of the return zones is different from the circumferential width of at least one other of the return zones. 9. The fluid working apparatus according to claim 8, wherein the circumferential width of the return zones progressively increases from the first working zone to the Nth working zone. 10. The fluid working apparatus according to claim 8, wherein the circumferential width of the return zones progressively decreases from the first working zone to the Nth working zone. 11. The fluid working apparatus according to claim 8, wherein the circumferential width of the housing inlet and the housing outlet are different. 12. The fluid working apparatus according to claim 4, wherein each boundary vane is circumferentially offset from the inlet side to the outlet side in a direction which is the same as the direction of rotation of the at least one rotor to create a pro-grade return flow. 13. The fluid working apparatus according to claim 4, wherein each boundary vane is circumferentially offset from the inlet side to the outlet side in a direction opposite from the direction of rotation of the at least one rotor to create a retro-grade return flow. 14. The fluid working apparatus according to claim 1, wherein the working flow chamber has a height, the at least one rotor has a radius, and the speed and torque of rotation of the at least one rotor is a function of the ratio of the radius to the height. 15. The fluid working apparatus according to claim 1, wherein the working flow chamber has a first height and the return chamber has a second height with the first and second heights being substantially equal. 16. The fluid working apparatus according to claim 1, wherein the working flow chamber has a first height and the return chamber has a second height with the second height being larger than the first height. 17. The fluid working apparatus according to claim 1, wherein the inner housing member outer surface has an elliptical configuration and the outer housing member inner surface has an elliptical configuration and the minor axes of both ellipsis are co-planar. 18. The fluid working apparatus according to claim 1, wherein the inner housing member outer surface has an elliptical configuration, the outer housing member inner surface has an elliptical configuration, and the minor axes of both ellipsis are offset relative to one another. 19. The fluid working apparatus according to claim 1, wherein the portion of the inner housing member facing the return chamber defines a recess such that a recessed area is defined within the return chamber. 20. The fluid working apparatus according to claim 1, wherein the plurality of blades taper from a smaller leading edge to a larger trailing edge and the working chamber is correspondingly tapered from a shorter inlet side to a taller outlet side. 21. The fluid working apparatus according to claim 1, wherein the plurality of blades taper from a larger leading edge to a smaller trailing edge and the working chamber is correspondingly tapered from a taller inlet side to a shorter outlet side. 22. A method of defining a re-circulating working fluid apparatus comprising the steps of: defining a housing structure with a housing inlet and a housing outlet, where the housing structure includes an outer housing member defining a circumferential tubular portion with an inner surface, andan inner housing member positioned within the outer housing member and having an outer surface spaced from the inner surface such that a working flow chamber is defined between the radially inner most portions of the inner housing member outer surface and the outer housing member inner surface;positioning a working assembly, having an inlet side and an opposite outlet side with at least one rotor having a plurality of blades positioned between the inlet and outlet sides, in the housing structure such that the rotor is rotatably supported therein with the plurality of blades extending into the working flow chamber; anddefining at least one single return chamber within the tubular portion and configured to return fluid flow from the outlet side of the working assembly to the inlet side of the working assembly, whereby all of the working fluid flows through (a) the housing inlet in a direction towards a first circumferential portion of a circumferential inlet area defined between the housing structure and the inlet side of the working assembly,(b) the first circumferential portion of the circumferential inlet area in a direction towards the outlet side of the working assembly while workingly engaging a first subset of the plurality of blades,(c) a first circumferential portion of a circumferential outlet area defined between the housing structure and the outlet side of the working assembly,(d) the single return chamber in a direction towards a second circumferential portion of the circumferential inlet area,(e) the second circumferential portion of the circumferential inlet area in a direction towards the outlet side of the working assembly while exclusively workingly engaging a second subset of the plurality of blades, and(f) the housing outlet.