Aerodynamic Wind-Turbine Blade Design for the National Rotor Testbed November 13, 2015 12:40 am Published by Admin The NRT blade shape as viewed from the tip and at an elevation angle of 30° above the suction surface. Sandia has designed a new wind-turbine blade for the National Rotor Testbed (NRT) project and for future experiments at the Scaled Wind Farm Technology (SWiFT) facility with a specific focus on scaled wakes. The new blades can produce a wake that has similitude to utility scale blades (of a 1.5 MW machine) despite the difference in size and location in the atmospheric boundary layer. The overall aerodynamic design philosophy ensures that the NRT blade has the same dimensionless circulation distribution as a full-scale blade so that the wake is created by the same shed vorticity. A predicted power coefficient of 0.47 is achieved through the use of efficient S825 and S814 airfoils, and a region 2 tip-speed-ratio of 9. The NRT preliminary design review took place in late October 2015 with an external review committee. Tags: efficient S825 and S814 airfoils, National Rotor Testbed, NRT, NRT preliminary design, SAND2015-9282O, Scaled Wind Farm Technology, SWIFT « Previous Next » Comments are closed here.