Cross-flow wind turbine

Details Cross-flow wind turbine Cross-flow wind turbine

F - Mech Eng,Light,Heat,Weapons

03

D

F03D 3/04 (2006.01)

Patent

CA 2577738

Disclosed are various embodiments of cross wind turbines (100) that are capable of providing high efficiencies over a wide range of wind velocities. An airfoil stator (102) causes wind to accelerate along its surface and creates a low pressure area on the leading face of the rotor blade (110) during the power stroke. A blocking stator blocks wind from impeding the movement of the rotor blades during the return cycle and directs wind onto the trailing face (122) of the rotor blades (110, 112) during the power cycle. A large pressure differential is created between the leading face (120) of the rotor blade (110) and the trailing face (122) of the rotor blade (110) during the power cycle which creates a large amount of force that rotates the rotor blade (112) about the central shaft (114). In some embodiments, gaps (208) are provided between the inside edge of the rotor blade (206) and a stationary shaft (202) which vents wind collected by the rotor blade (204) during certain portions of the rotation cycle. The vented wind increases the pressure on the trailing face (212) of the rotor blades (204) during the return cycle to further assist in the efficiency of this system.

Dans divers modes de réalisation, l'invention concerne des éoliennes à flux transversal (100) pouvant être utilisées de manière hautement efficace sur une plage de vitesses de vent étendue. Un stator aérodynamique (102) fait accélérer le vent le long de sa surface et crée une zone basse pression sur la face avant de la pale (110) du rotor pendant la course motrice. Un stator de blocage bloque le vent afin d'empêcher le mouvement des pales du rotor pendant le cycle de retour et dirige le vent sur la face arrière (122) des pales (110, 112) du rotor pendant la course motrice. Un différentiel de pression important est créé entre la face avant (120) de la pale (110) du rotor et la face arrière (122) de la pale (110) du rotor pendant le cycle moteur, ce qui permet de créer une quantité de force importante qui entraîne la rotation de la pale (112) du rotor autour de l'arbre central (114). Dans certains modes de réalisation, des espacements (208) sont ménagés entre le bord intérieur de la pale (206) du rotor et un arbre stationnaire (202) qui évacue le vent collecté par la pale (204) du rotor pendant certaines parties du cycle de rotation. Le vent évacué fait augmenter la pression sur la face arrière (212) des pales (204) du rotor pendant le cycle de retour afin d'améliorer davantage l'efficacité du système.

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