Blade flow deflector
An airfoil blade assembly including a blade which includes a lift generating section with a first profiled body defined between a pressure surface and a suction surface. The first profiled body extends from a first leading edge to a first trailing edge with a first chord extending form the first leading edge to the first trailing edge and being perpendicular to the radial direction. At least one flow deflector extends along either the pressure surface or the suction surface within the lift generating section of the blade. The at least one flow deflector defines a second profiled body extending between a second leading edge and a second trailing edge with a second chord extending between the second leading edge and the second trailing edge. The second profiled body defines an outer surface facing away from respective pressure surface or suction surface along which the flow deflector extends.
1. An airfoil blade assembly comprising:
a blade extending in a radial direction from a root towards a tip, the blade including a lift generating section with a first profiled body defined between a pressure surface and a suction surface, the first profiled body extending from a first leading edge to a first trailing edge with a first chord extending form the first leading edge to the first trailing edge and being perpendicular to the radial direction;
a plurality of flow deflectors extending along either the pressure surface or the suction surface within the lift generating section of the blade, the plurality of flow deflectors defining a second profiled body extending between a second leading edge and a second trailing edge with a second chord extending between the second leading edge and the second trailing edge, the second profiled body defining an outer surface facing away from respective pressure surface or suction surface along which the plurality of flow deflectors extend;
wherein the plurality of flow deflectors are positioned along a length of the blade so that a radial component of velocity of an incoming airflow is redirected to produce an additional amount of torque on a rotor, thereby increasing overall power produced by a turbine incorporating the airfoil blade assembly.
2. The airfoil blade assembly according to claim 1 wherein the second chord is at an angle α of between −5° and 45° relative to the first chord.
3. The airfoil blade assembly according to claim 1 wherein the second chord is at an angle α of between 0° and 15° relative to the first chord.
4. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are separated from one another by a given distance.
5. The airfoil blade assembly according to claim 4 wherein the given distance is equal to a length of the first chord.
6. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are positioned along the blade between the first leading edge and the first trailing edge.
7. The airfoil blade assembly according to claim 1 wherein the first profile body has a first height and the second profile body has a second height and wherein the second height is between 1/10 to 1 that of the first height.
8. The airfoil blade assembly according to claim 1 wherein the first profile body has a first height and the second profile body has a second height and wherein the second height is between ⅛ to ½ that of the first height.
9. The airfoil blade assembly according to claim 1 wherein the second profile body has a width that is equal to approximately 1-10% a length of the first chord.
10. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are formed integrally with the first profile body.
11. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are formed separately from the first profile body and are attached thereto.
12. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are attached to the first profile body utilizing aerospace double-sided tape.
13. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are attached to the first profile body utilizing flat head rivets.
14. The airfoil blade assembly according to claim 1 wherein the plurality of flow deflectors are adjustably connected to the profile body.
15. The airfoil blade assembly according to claim 1 wherein the blade has an in-plane curved configuration.
16. A turbine assembly comprising:
a hub configured to rotate in a direction of rotation;
a plurality of blade assemblies according to claim 1 attached to the hub assembly,
wherein the plurality of flow deflectors are configured so as to alter the incident airflow so that an additional force is produced in the direction of rotation and an additional power is generated.
17. A hydrofoil blade assembly comprising:
a blade extending in a radial direction from a root towards a tip, the blade including a lift generating section with a first profiled body defined between a pressure surface and a suction surface, the first profiled body extending from a first leading edge to a first trailing edge with a first chord extending form the first leading edge to the first trailing edge and being perpendicular to the radial direction;
a plurality of flow deflectors extending along either the pressure surface or the suction surface within the lift generating section of the blade, the plurality of flow deflectors defining a second profiled body extending between a second leading edge and a second trailing edge with a second chord extending between the second leading edge and the second trailing edge, the second profiled body defining an outer surface facing away from respective pressure surface or suction surface along which the plurality of flow deflectors extend;
wherein the plurality of flow deflectors are positioned along a length of the blade so that a radial component of velocity of an incoming water flow is redirected to produce an additional amount of torque on a rotor, thereby increasing overall power produced by a turbine incorporating the hydrofoil blade assembly.
18. The hydrofoil blade assembly of claim 17 wherein the plurality of flow deflectors are separated from one another by a given distance.
19. The hydrofoil blade assembly of claim 17 wherein the plurality of flow deflectors are formed integrally with the first profile body.
20. The hydrofoil blade assembly of claim 17 wherein the plurality of flow deflectors are formed separately from the first profile body and are attached thereto.
21. A turbine assembly comprising:
a hub configured to rotate in a direction of rotation;
a plurality of blade assemblies according to claim 17 attached to the hub assembly,
wherein the plurality of flow deflectors are configured so as to alter the incident water flow so that an additional force is produced in the direction of rotation and an additional power is generated.