Wind turbine system for power generation
A wind turbine system is disclosed. The wind turbine system includes a flow consolidating conduit and an air driven rotor assembly. The air driven rotor assembly includes a rotor housing, a rotor within the rotor housing, and an annular pre-rotor flow recirculation passage defined between the rotor housing and the rotor. The rotor has a plurality of air driven blades distributed around a rotor rotation axis. The rotor has a radially inward entry direction. The recirculation passage surrounds the rotor. The recirculation passage extends from a recirculation passage upstream end to a recirculation passage downstream end. The recirculation passage downstream end is open ended and provides fluid continuity from the recirculation passage downstream end to the recirculation passage upstream end. The recirculation passage has a passage cross-sectional area that decreases gradually from the recirculation passage upstream end to the recirculation passage downstream end.
1. A wind turbine system comprising:
a flow consolidating conduit that extends from an airflow capture inlet to a consolidating conduit downstream end; and
an air driven rotor assembly having a rotor assembly upstream end located downstream of the consolidating conduit downstream end, the air driven rotor assembly comprising:
a rotor housing;
a rotor within the rotor housing, the rotor having a plurality of air driven blades distributed around a rotor rotation axis and multiple air redirecting blades located radially inward of the air driven blades, the rotor having a radially inward entry direction, and each air redirecting blade:
being circumferentially spaced apart from each other air redirecting blade of the multiple air redirecting blades, and
extending radially outward of the rotation axis to a radially outermost blade tip, the blade tip extending axially and having a first tip portion connected to an axially adjacent second tip portion, the first and second tip portions being angled relative to the axis of rotation so that the blade tip has a V-shape; and
an annular pre-rotor flow recirculation passage defined between the rotor housing and the rotor,
the recirculation passage surrounding the rotor,
the recirculation passage extending from a recirculation passage upstream end to a recirculation passage downstream end,
the recirculation passage downstream end being open ended and providing fluid continuity from the recirculation passage downstream end to the recirculation passage upstream end,
the recirculation passage having a passage cross-sectional area that decreases gradually from the recirculation passage upstream end to the recirculation passage downstream end.
2. The wind turbine system of claim 1 , wherein the plurality of air driven blades have a radially inward discharge direction.
3. The wind turbine system of claim 1 , wherein the air redirecting blades have an axial discharge direction that is substantially parallel to the rotation axis.
4. The wind turbine system of claim 1 , wherein the air redirecting blades have a herringbone shape.
5. The wind turbine system of claim 1 , wherein the passage cross-sectional area decreases continually from the recirculation passage upstream end to the recirculation passage downstream end.
6. The wind turbine system of claim 1 , wherein a plurality of flow partitions subdivide a cross-sectional area of the flow consolidating conduit into three or more flow paths, the three or more flow paths gradually merging into a single flow path at the consolidating conduit downstream end.
7. The wind turbine system of claim 1 , further comprising an electric generator, the electric generator being connected to the air driven rotor.
8. The wind turbine system of claim 1 , further comprising a wind turbine housing that encloses the flow consolidating conduit and the air driven rotor assembly.
9. The wind turbine system of claim 8 , wherein at least a portion of an outer surface of the wind turbine housing is a dimpled surface.
10. The wind turbine system of claim 1 , further comprising an outlet conduit in fluid connection with the rotor to discharge airflow from the rotor out of the wind turbine system.
11. A building comprising the wind turbine system of claim 1 .
12. A method of generating energy in a wind turbine system, the method comprising:
capturing wind as airflow in an airflow capture inlet of the wind turbine system;
directing the airflow through a flow consolidating conduit of the wind turbine system to provide a consolidated airflow to an air driven rotor of the wind turbine system;
directing the consolidated airflow through an open-ended and annular pre-rotor flow recirculation passage that surrounds the rotor and directs airflow radially inward towards air driven blades distributed around a rotor rotation axis of the rotor, the pre-rotor flow recirculation passage having a passage cross-sectional area that decreases gradually from a recirculation passage upstream end to a recirculation passage downstream end, wherein the rotor has multiple air redirecting blades located radially inward of the air driven blades, each air redirecting blade:
being circumferentially spaced apart from each other air redirecting blade of the multiple air redirecting blades, and
extending radially outward of the rotation axis to a radially outermost blade tip, the blade tip extending axially and having a first tip portion connected to an axially adjacent second tip portion, the first and second tip portions being angled relative to the axis of rotation so that the blade tip has a V-shape;
driving an electric generator using the air driven blades of the rotor; and
generating the energy at the electric generator.
13. The method of claim 12 , wherein directing the airflow through the flow consolidating conduit of the wind turbine system comprises partitioning the airflow using a plurality of flow partitions that subdivide the cross-sectional area of the flow consolidating conduit into three or more flow paths, the three or more flow paths gradually merging into a single flow path so that the airflow exits the flow consolidating conduit as the consolidated airflow.
14. The method of claim 12 , wherein the plurality of air driven blades have a radially inward discharge direction.
15. The method of claim 14 , further comprising discharging airflow from the rotor in an axial discharge direction that is substantially parallel to the rotation axis of the rotor.
16. The method of claim 12 , wherein the air redirecting blades have a herringbone shape.
17. The method of claim 12 , wherein the passage cross-sectional area decreases continually from the recirculation passage upstream end to the recirculation passage downstream end.