Experimental Progress

Atargis 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 1:300

The 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

Scale Testing 1:10

Atargis Energy has conducted two testing campains at 1:10 scale. While the first campaign in July/August 2011 was focused on wave generation, the second testing campaign in June/July of 2012 demonstrated successful conversion of wave power to electrical power. The model used for these tests had a diameter of 2m, as well as a hydrofoil span of 4.5m. Two off-the-shelve industrial 3 Phase gear motors connected to four quadrant capable motor controllers were used to convert the wave energy to electricity. The generated electricity with 370W of power was not just accurately measured by several independent means, but could be felt by touching the breaking resistor that converted the electicity to heat (as there were no means to feed it back to the power grid). This first ever wave power conversion by means of a Cycloidal Wave Energy Converter took place at the Texas A&M Offshore Technology Research Center's wave basin on July 12th, 2012. More details will be posted once data post processing has been finished.