Experimental ProgressAtargis Energy Corporation has developed a scaled approach to prepare for the ocean going product demonstration. The first is a 1:300 test model which was fabricated in Fall 2010, tested at the US Air Force Academy and is still in operation. The second is a 1:10 scale model which is currently being fabricated at Atargis Energy Corporation and tested at OTRC (Texas A&M University) in three consecutive campaigns during 2011 and 2012.
Scale Testing 1:300The wave tunnel was fabricated such that a flap paddle maker generated a wave which propagated to the right and was diffused on a sloped beach. The Cycloidal Wave Energy Converter was placed directly in the middle of the tunnel. The tunnel was designed so that the wavelength was sufficiently smaller than the depth of the water, thus simulating a deep ocean wave environment. The CycWEC was oriented for a deep ocean wave in that the main shaft was placed perpendicular to the incoming wave and parallel to the water surface. Up and down-wave surface elevation sensors were placed at a distance of three wavelengths from the center of the CycWEC. The upwave sensor is used to estimate the incoming wave characteristics and drive the CycWEC accordingly to extract energy. The downwave sensor is used only to measure the resulting wave surface.
The model consisted of two hydrofoils placed at 0o and 180o locations. The pitch of blades was controlled with Model servos controlled blade pitch by means of a belt drive system.
The efficiency of the CycWEC was determined from a control volume analysis. The measurements of the up and downwave sensors were used to estimate the power at those locations. The efficiency was then computed by the differential power from the two measurements normalized by the total power.The wave is propogating from left to right, and the CycWEC is in the middle. The wave height is drastically reduced from the upwave and downwave directions. The 1:300 scale has shown:
- Cancellation of harmonic waves with 95% efficiency
- Successful feedback control based on wave gauges
- Demonstrated irregular wave cancellation