جستجوی مقالات مرتبط با کلیدواژه « ایرفویل naca0015 » در نشریات گروه « مکانیک »

The The wind turbine converts the kinetic energy of the wind current into the rotational energy of the rotor shaft. The use of vertical axis wind turbines as a source of clean energy production is of great importance. Among the advantages of vertical axis wind turbine over horizontal axis wind turbine are low production cost, lightweight, the efficiency of the installation, and use in residential zones. The darriues blades of vertical axis wind turbines are more in the kind of straight or helical blades. The central difficulty of Darius vertical axis wind turbines is their primary self-starting, which is the basis of this study. They increase self-initiation at low speeds. For this purpose, Darius vertical axis wind turbine was designed and built-in CATIA software. NACA0015 is made for airfoils and the material used for straight and porous blades is plain aluminum sheet and porcelain embossed sheet, both of which are series alloys of aluminum and the equipment used in manufactured and calibrated Manufacturing and calibrating. The result showed that the Ambas blade wind turbine needs less torque to start up to a speed of 9m/s than the vertical blade axis wind turbine.

In present study the effects of plasma actuation on the position of the separation point by using the different types of voltage functions including the sinusoid, square and triangular has been investigated. Also, the ability of this actuator for increasing the lift coefficient of airfoil NACA 0015 at angles of attack 0, 5.3, 11.5 and 17.5 has been studied and the best voltage function type for increasing of lift coefficient and removing or weakening the separation point has been determined. At first the pressure coefficient over the airfoil was calculated when actuation was applied and was validated by comparing with experimental data of Sosa. Then the variation of the velocity profiles and position of separation point in the three regions over the airfoil and a region behind the airfoil according to the voltage types sinusoid, square and triangular for different angles of attack have been predicted time-dependent numerically by COMSOL Multiphysics.