The Comparison of Form Drag and Profile Drag of a Wind Turbine Blade Section in Pitching
Extensive wind tunnel tests have been conducted to investigate the unsteady flow field over and behind a 2D model of a 660 kW wind turbine blade section in pitching motion. The surface pressure and wake dynamic pressure variation at a distance of 1.5 chord length from trailing edge were measured by pressure transducers during several oscillating cycles at 3 reduced frequencies and oscillating amplitudes. Moreover, form drag and linear momentum deficit are extracted and compared at various conditions. The results show that the wake velocity field and surface pressure of the model have similar behavior before and after the airfoil beyond the static stall angle of attack. In addition, the effects of reduced frequency and oscillation amplitudes are discussed. Keywords—Pitching motion, form drag, Profile drag, wind turbine.
Unsteady wake measurements of an oscillating flap at transonic speeds
Mesure en soufflerie des profils de sillage stationnaire ou instationnaire d'un profil aerodynamique avec volet oscillant. Mesure des profils de pression et de vitesse en 4 points axiaux. Etude de l'influence de l'angle du volet
Technical Note: Accuracy of Straight-Line Segmentation Applied to Curvilinear Vortex Filaments
Electrical drive apparatus for a vehicle comprising a detachable battery pack and a further unit comprising an electric motor, a differential with output shafts to respective vehicle wheels and a transmission from the motor to the differential including a universally jointed shaft, the axes of the motor differential output shafts and the shaft being substantially parallel and the motor being on the sprung and the differential being on the unsprung part of the vehicle.