Tubular wave power device
View Patent ↗A tubular wave energy converter configured to remain afloat near the surface of a wave field and trap a water column oscillating asymmetrically to the wave field in which the converter is located. Water column oscillations create a pressure flux providing motive power for a generator. The converter, generator and a powered payload making up an autonomous wave powered device are packaged to fit within and be deployed by a torpedo launcher. The autonomous device may be deployed above or beneath the surface. Device buoyant characteristics are configured to maintain the device afloat and self-righting toward an upright oriented for operation in the wave field.
1. A tubular wave power device comprising:
a tubular structure configured to be torpedo tube launchable and capable of powering an autonomous device;
wherein the tubular structure comprises:
a power take-off internal to the tubular structure that comprises an impeller, wherein the impeller is driven by oscillating pressurized air flow in and out of the tubular structure caused by action of surrounding water wave field and buoyant oscillations of the tubular structure; and
a power output system connected to the power take off.
2. The tubular wave power device of claim 1 , wherein the power take-off comprises an oscillating water column style wave energy converter drivetrain.
3. The tubular wave power device of claim 2 , wherein the tubular structure has mass and buoyancy geometrically distributed in the tubular structure to cause asymmetric relative oscillation of a water column contained within the tubular structure when the tubular structure and water column are excited by the surrounding water wave field surrounding the wave power device.
4. The tubular wave power device of claim 3 , wherein the geometric distribution of the tubular structure mass and buoyancy may be tuned to wave characteristics at an operation location.
5. A wave power device comprising:
a hollow tube structure with an open end and a power take-off end; and
a power output system connected to the power take-off end;
the hollow tube structure and power output system configured to be torpedo tube launchable with mass and buoyancy configured to keep the tube structure and power output system afloat with the tube structure in a generally upright, open end downward orientation, the tube structure buoyantly oscillating in a surrounding wave field when placed therein causing asymmetric oscillation of a water column contained therein, water column oscillation creating a varying pressure differential at the power take-off end and thereby provide motive force to the power output system;
wherein the power take-off comprises an impeller disposed within the hollow tube structure, wherein the impeller is driven by oscillating pressurized air flow in and out of the tubular structure caused by action of surrounding water wave field and buoyant oscillations.
6. The wave power device of claim 5 , wherein the wave power device is free floating in the wave field.
7. The wave power device of claim 5 , wherein the tube structure is configured to cause sympathetic oscillation of the tube structure and the water column contained therein in response to the surrounding wave field.
8. The wave power device of claim 7 , wherein the tube structure is configured such that the tube structure and water column contained therein have a coupled natural frequency matching the predominant frequency of the surrounding wave field.
9. A method of operating a wave energy powered device comprising:
providing a wave energy powered device comprising a wave energy power device and an autonomous device, the wave energy device having a tubular structure configured to fit within a torpedo tube dimensional envelope and capable of powering the autonomous device;
providing a delivery vehicle having a torpedo launcher sized to launch the wave energy powered device, transporting the wave energy powered device to a desired geographic location using the delivery vehicle;
loading the wave energy powered device into the torpedo launcher; and
ejecting the wave energy powered device from the torpedo launcher into a body of water;
wherein the wave energy powered device comprises a power take-off comprising an impeller disposed within the tubular structure, wherein the impeller is driven by oscillating pressurized air flow in and out of the tubular structure caused by action of surrounding water wave field and buoyant oscillations.
10. The method of claim 9 , wherein the delivery vehicle is a surface marine vessel, a sub-surface marine vessel, or an aircraft.