A passive bluff body is disposed in flowing fluid for generating power. The shape of the bluff body supports a predetermined oscillatory clockwise and counter clockwise movement about a pivot absent the influence of electrical or mechanical devices for biasing the bluff body's motion for a given vel
A passive bluff body is disposed in flowing fluid for generating power. The shape of the bluff body supports a predetermined oscillatory clockwise and counter clockwise movement about a pivot absent the influence of electrical or mechanical devices for biasing the bluff body's motion for a given velocity, or range of velocities, of the fluid flow.
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1. An apparatus for generating electric current, comprising: a pivot;a three dimensional triangular shaped bluff body having a triangular cross section and comprising: a first sidewall and a second sidewall coupled together at an apex for being directed into the fluid flow;an opening for mating with
1. An apparatus for generating electric current, comprising: a pivot;a three dimensional triangular shaped bluff body having a triangular cross section and comprising: a first sidewall and a second sidewall coupled together at an apex for being directed into the fluid flow;an opening for mating with the pivot for supporting rotation of the bluff body thereabout;at least a back wall;a second rounded corner opposite the apex and between the first sidewall and the back wall;a third rounded corner opposite the apex and between the second sidewall and the back wall;a first vortex separation vane along each of the first and second sidewalls, the vortex separation vane extending in a direction of fluid flow, for when disposed in a flowing fluid with velocity v1 resulting in vortex shedding for inducing a predetermined oscillating movement about the pivot for resulting in relative motion between the pivot and the bluff body; anda generator coupled between the pivot and the bluff body for generating electric current in response to the relative motion. 2. The apparatus according to claim 1, further comprising a second vortex separation vane spaced from the first vortex separation vane, wherein the second rounded corner and the third rounded corner each have a diameter of curvature, and wherein the first vortex separation vane and the second vortex separation vane are separated by a distance of between 7 and 20 times the diameter of curvature. 3. The apparatus according to claim 2, further comprising a top cap disposed at a top of the bluff body and extending beyond at least a back wall along the direction of fluid flow. 4. The apparatus according to claim 3, further comprising a bottom cap disposed at a bottom of the bluff body and extending beyond the at least a back wall along the direction of fluid flow. 5. The apparatus according to claim 4, wherein the top cap and the bottom cap are parts separate from the bluff body and disposed adjacent thereto for supporting relative movement between the bluff body and each of the top cap and the bottom cap. 6. An apparatus for generating electric current, comprising: a pivot;a bluff body for being disposed within a flow of a fluid, comprising: a first sidewall and a second sidewall joined via an apex;an opening defined within the bluff body at a location between the first sidewall and the second sidewall, the opening for receiving the pivot for supporting relative rotational movement between the bluff body and the pivot;at least a back wall;a second rounded corner opposite the apex and between the first sidewall and the back wall;a third rounded corner opposite the apex and between the second sidewall and the back wall;a vortex separation vane, which projects from the first side wall and extends between the apex and the second rounded corner, and which projects from the second side wall and extends between the apex and the third rounded corner; anda generator coupled between the pivot and the bluff body for generating electric current in response to the relative rotational movement. 7. The apparatus according to claim 6, further comprising a second vortex separation vane spaced from the first vortex separation vane, wherein the second rounded corner and the third rounded corner each have a diameter of curvature, and wherein the first vortex separation vane and the second vortex separation vane are separated by a distance of between 7 and 20 times the diameter of curvature. 8. The apparatus according to claim 7, further comprising a top cap disposed at a top of the bluff body and extending beyond at least a back wall along the direction of fluid flow. 9. The apparatus according to claim 8, further comprising a bottom cap disposed at a bottom of the bluff body and extending beyond the at least a back wall along the direction of fluid flow. 10. The apparatus according to claim 9, wherein the top cap and the bottom cap are parts separate from the bluff body and disposed adjacent thereto for supporting relative movement between the bluff body and each of the top cap and the bottom cap. 11. The apparatus according to claim 6, wherein the location of the opening is relatively closer to the apex than to the back wall and the apex is directed into the flow of the fluid. 12. The apparatus according to claim 6, wherein the location of the opening is relatively closer to the back wall than to the apex and the back wall is directed into the flow of the fluid. 13. An apparatus for generating electric current, comprising: a pivot;a bluff body for being disposed within a flowing fluid, the bluff body comprising: first and second sidewalls that converge one toward the other to form an apex of the bluff body;an opening defined within the bluff body at a location that is between the first and second sidewalls, the opening for receiving the pivot for supporting relative rotational movement between the bluff body and the pivot;a back wall disposed opposite the apex and extending between the first and second sidewalls;a first vortex separation vane projecting orthogonally from each of the first and second sidewalls and extending along each of the first and second sidewalls from the apex to the back wall;a second vortex separation vane projecting orthogonally from each of the first and second sidewalls and extending along each of the first and second sidewalls from the apex to the back wall, the second vortex separation vane being spaced-apart from and parallel to the first vortex separation vane; anda generator coupled between the pivot and the bluff body for generating electric current in response to the relative rotational movement. 14. The apparatus according to claim 13, wherein the back wall meets the first and second sidewalls at respective rounded corners each having a diameter of curvature, and wherein the first vortex separation vane and the second vortex separation vane are separated by a distance of between 7 and 20 times the diameter of curvature. 15. The apparatus according to claim 13, further comprising a top cap disposed at a top of the bluff body and extending beyond the back wall of the bluff body. 16. The apparatus according to claim 15, further comprising a bottom cap disposed at a bottom of the bluff body and extending beyond the back wall of the bluff body. 17. The apparatus according to claim 16, wherein the top cap and the bottom cap are parts separate from the bluff body and are disposed adjacent thereto for supporting relative movement between the bluff body and each of the top cap and the bottom cap. 18. The apparatus according to claim 13, wherein the location of the opening is relatively closer to the apex than to the back wall and the apex is directed into the flow of the flowing fluid. 19. The apparatus according to claim 13, wherein the location of the opening is relatively closer to the back wall than to the apex and the back wall is directed into the flow of the flowing fluid.
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