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An axial flow positive displacement gas turbine engine component such as a compressor or a turbine or an expander includes a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet. The rotor assembly includes a main rotor and one or more gate ro

An axial flow positive displacement gas turbine engine component such as a compressor or a turbine or an expander includes a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet. The rotor assembly includes a main rotor and one or more gate rotors rotatable about parallel main and gate axes of the main and gate rotors respectively. The main and gate rotors having intermeshed main and gate helical blades extending radially outwardly from annular main and gate hubs, circumscribed about, and wound about the main and gate axes respectively. Intersecting main and gate annular openings in the axial flow inlet extend radially between a casing surrounding the rotor assembly and the main and gate hubs. The main helical blades transition from 0 to a full radial height in a downstream direction in an inlet transition section.

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1. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatab

1. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,central portions of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 2. An axial flow positive displacement gas turbine engine component as claimed in claim 1, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 3. An axial flow positive displacement gas turbine engine component as claimed in claim 1, further comprising the main and gate rotors being geared together. 4. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion,the main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section, andthe main and gate rotors being geared together. 5. An axial flow positive displacement gas turbine engine component as claimed in claim 4, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 6. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,central portions of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion,the main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section,an outlet transition section axially aft and downstream of the central portion,the main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section,a flowpath disposed radially between the main and gate hubs and the casing and extending axially downstream from the axial flow inlet to the axial flow outlet,the main and gate helical blades are rotatable within the flowpath,the flowpath including in serial downstream flow relationship an inlet flowpath section disposed in the inlet transition section, an annular central flowpath section, and an outlet flowpath section disposed in the outlet transition section, andan annular inlet area of the inlet flowpath section smaller than an annular outlet area of the inlet flowpath section. 7. An axial flow positive displacement gas turbine engine component as claimed in claim 6, further comprising the outlet flowpath section having an annular cross-sectional area decreasing in the downstream direction. 8. An axial flow positive displacement gas turbine engine component as claimed in claim 6, further comprising the main and gate rotors being geared together. 9. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 10. An axial flow positive displacement gas turbine engine component as claimed in claim 9, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 11. An axial flow positive displacement gas turbine engine component as claimed in claim 10, further comprising the main and gate rotors being geared together. 12. An axial flow positive displacement gas turbine engine component as claimed in claim 11, further comprising: a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 13. An axial flow positive displacement gas turbine engine component as claimed in claim 12, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 14. An axial flow positive displacement gas turbine engine component as claimed in claim 10, further comprising: a flowpath disposed radially between the main and gate hubs and the casing and extending axially downstream from the axial flow inlet to the axial flow outlet;the main and gate helical blades are rotatable within the flowpath;the flowpath including in serial downstream flow relationship an inlet flowpath section disposed in the inlet transition section, an annular central flowpath section, and an outlet flowpath section disposed in the outlet transition section, andan annular inlet area of the inlet flowpath section smaller than an annular outlet area of the inlet flowpath section. 15. An axial flow positive displacement gas turbine engine component as claimed in claim 14, further comprising the outlet flowpath section having an annular cross-sectional area decreasing in the downstream direction. 16. An axial flow positive displacement gas turbine engine component as claimed in claim 14, further comprising the main and gate rotors being geared together. 17. An axial flow positive displacement gas turbine engine compressor comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively,the first main and gate twist slopes being less than the second main and gate twist slopes respectively,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 18. An axial flow positive displacement gas turbine engine compressor as claimed in claim 17, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 19. An axial flow positive displacement gas turbine engine compressor as claimed in claim 17, further comprising the main and gate rotors being geared together. 20. An axial flow positive displacement gas turbine engine compressor comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively,the first main and gate twist slopes being less than the second main and gate twist slopes respectively,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,the main and gate rotors being geared together,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 21. An axial flow positive displacement gas turbine engine compressor as claimed in claim 20, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 22. An axial flow positive displacement gas turbine engine compressor comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet;the rotor assembly including a main rotor and one or more gate rotors;the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively;the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively;the main helical blades intermeshed with the gate helical blades;the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors;the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively;the first main and gate twist slopes being less than the second main and gate twist slopes respectively;the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively;a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub;an inlet transition section axially forward and upstream of the central portion;the main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section;an outlet transition section axially aft and downstream of the central portion;the main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section;a flowpath disposed radially between the main and gate hubs and the casing and extending axially downstream from the axial flow inlet to the axial flow outlet;the main and gate helical blades are rotatable within the flowpath;the flowpath including in serial downstream flow relationship an inlet flowpath section disposed in the inlet transition section, an annular central flowpath section, and an outlet flowpath section disposed in the outlet transition section, andan annular inlet area of the inlet flowpath section smaller than an annular outlet area of the inlet flowpath section. 23. An axial flow positive displacement gas turbine engine compressor as claimed in claim 22, further comprising the outlet flowpath section having an annular cross-sectional area decreasing in the downstream direction. 24. An axial flow positive displacement gas turbine engine compressor as claimed in claim 22, further comprising the main and gate rotors being geared together. 25. An axial flow positive displacement gas turbine engine expander comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively,the first main and gate twist slopes being greater than the second main and gate twist slopes respectively,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 26. An axial flow positive displacement gas turbine engine expander as claimed in claim 25, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 27. An axial flow positive displacement gas turbine engine expander as claimed in claim 26, further comprising: a flowpath disposed radially between the main and gate hubs and the casing and extending axially downstream from the axial flow inlet to the axial flow outlet;the main and gate helical blades are rotatable within the flowpath;the flowpath including in serial downstream flow relationship an inlet flowpath section disposed in the inlet transition section, an annular central flowpath section, and an outlet flowpath section disposed in the outlet transition section, andan annular inlet area of the inlet flowpath section smaller than an annular outlet area of the inlet flowpath section. 28. An axial flow positive displacement gas turbine engine expander as claimed in claim 27, further comprising the outlet flowpath section having an annular cross-sectional area decreasing in the downstream direction. 29. An axial flow positive displacement gas turbine engine expander as claimed in claim 27, further comprising the main and gate rotors being geared together. 30. An axial flow positive displacement gas turbine engine expander as claimed in claim 25, further comprising the main and gate rotors being geared together. 31. An axial flow positive displacement gas turbine engine expander comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including a main rotor and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the main helical blades of the rotor assembly having different first and second main twist slopes in first and second sections respectively and the gate helical blades of the rotor assembly having different first and second gate twist slopes in the first and second sections respectively,the first main and gate twist slopes being greater than the second main and gate twist slopes respectively,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,the main and gate rotors being geared together,a central portion of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 32. An axial flow positive displacement gas turbine engine expander as claimed in claim 31, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 33. An axial flow positive displacement gas turbine engine component comprising: a rotor assembly extending from a fully axial flow inlet to a downstream axially spaced apart axial flow outlet,the rotor assembly including one or more main rotors and one or more gate rotors,the main and gate rotors being rotatable about parallel main and gate axes of the main and gate rotors respectively,the main and gate rotors having two or more main helical blades and two or more gate helical blades wound about the main and gate axes respectively,the main helical blades intermeshed with the gate helical blades,the main and gate helical blades extending radially outwardly from annular main and gate hubs circumscribed about the main and gate axes of the main and gate rotors,the axial flow inlet including intersecting main and gate annular openings extending radially between a casing surrounding the rotor assembly and the main and gate hubs respectively,central portions of the main helical blades extending axially and downstream and having a full radial height as measured radially outwardly from the main hub,an inlet transition section axially forward and upstream of the central portion, andthe main helical blades transitioning from 0 radial height to a fully developed blade profiles having the full radial height as measured radially from the main hub in a downstream direction in the inlet transition section. 34. An axial flow positive displacement gas turbine engine component as claimed in claim 33, further comprising: an outlet transition section axially aft and downstream of the central portion, andthe main helical blades transitioning from the fully developed blade profiles having the full radial height to the 0 radial height as measured radially from the main hub in the downstream direction in the outlet transition section. 35. An axial flow positive displacement gas turbine engine component as claimed in claim 33, further comprising the main and gate rotors being geared together. 36. An axial flow positive displacement gas turbine engine component as claimed in claim 33, further comprising the main and gate axes being co-planar. 37. An axial flow positive displacement gas turbine engine component as claimed in claim 33, further comprising the main and gate axes being non-planar.