What are the aerodynamic characteristics that define the performance of a Wells turbine in an OWC WEC?

The performance of a Wells turbine in an Oscillating Water Column (OWC) Wave Energy Converter (WEC) is defined by several key aerodynamic characteristics. First, its ability to rotate continuously in the same direction regardless of the direction of the airflow. This is crucial because the air in an OWC oscillates back and forth as the water column rises and falls. Second, the turbine's starting torque and running torque characteristics. A high starting torque is needed to overcome inertia and begin rotation when the airflow changes direction. The running torque, which is related to the power output, should be high across a wide range of airflow velocities. Third, the turbine's efficiency, which is the ratio of mechanical power output to the aerodynamic power input. Maximizing efficiency is critical for maximizing energy capture from the waves. Fourth, the turbine's pressure drop characteristics. The turbine should be designed to minimize the pressure drop across it, as a high pressure drop reduces the airflow and overall energy capture. Finally, the turbine's stall characteristics are important. Stall occurs when the angle of attack of the airflow on the turbine blades becomes too high, causing a sudden loss of lift and a decrease in efficiency. The turbine should be designed to delay stall and maintain stable performance over a wide range of operating conditions. These characteristics are interlinked and are optimized through careful blade design and turbine geometry.