Wind turbine system using twin savonius-type rotors

A Savonius rotor assembly for interacting with a moving fluid, comprising:

• a support framework;
• a first rotor rotatably mounted on the support framework for rotation about a first central, vertically extending axis, the first rotor having two blades disposed symmetrically about the first central, vertically extending axis, each of the blades having an outer edge and an inner edge with respect to the first central, vertically extending axis, the outer edges of the blades lying on a circle defining a diameter of the first rotor, the blades further having a first curved portion and a second curved portion, the first curved portion beginning at the outer edge and terminating at the second curved portion with the first curved portion defining a surface generally concave with respect to the first central, vertically extending axis, the first curved portion having a radius of curvature which becomes progressively less from the outer edge to the second curved portion, the second curved portion coming progressively closer to a plane containing the first central, vertically extending axis and the outer edge of the blade as the second curved portion extends from the first curved portion to the inner edge of the blade, the maximum displacement of the blades from the plane being less than one quarter of the diameter of the first rotor;
• a second rotor rotatably mounted on the support framework for rotation about a second central, vertically extending axis the second rotor being positioned at substantially the same horizontal level as the first rotor, the second rotor having two blades disposed symmetrically about the second central, vertically extending axis, each of the blades having an outer edge and an inner edge with respect to the second central, vertically extending axis, the outer edges of the blades lying on a circle defining a diameter of the second rotor, the blades further having a first curved portion and a second curved portion, the first curved portion beginning at the outer edge and terminating at the second curved portion with the first curved portion defining a surface generally concave with respect to the second central, vertically extending axis, the first curved portion having a radius of curvature which becomes progressively less from the outer edge to the second curved portion, the second curved portion coming progressively closer to a plane containing the second central, vertically extending axis and the outer edge of the blade as the second curved portion extends from the first curved portion to the inner edge of the blade, the maximum displacement of the blades from the plane being less than one quarter of the diameter of the second rotor;
• and
• a deflector member having a width and extending substantially along the heights of the first and second rotors and positioned on the side of the first and second rotors facing the direction from which the fluid is flowing.

A Savonius rotor assembly for interacting with a moving fluid, comprising:

• a support framework;
• a first rotor rotatably mounted on the support framework for rotation about a first central, vertically extending axis, the first rotor having a shaft, a top, a bottom, a height and at least two blades, each blade having an inner and an outer edge with respect to the first central, vertically extending axis, the blades positioned to allow fluid flow between the inner edges thereof;
• a second rotor rotatably mounted on the support framework for rotation about a second central, vertically extending axis, the second rotor having a shaft, a top, a bottom, a height and at least two blades, each blade having an inner and an outer edge with respect to the second central, vertically extending axis, the blades positioned to allow fluid flow between the inner edges thereof, the blades of the first rotor and the blades of the second rotor configured so that the first rotor rotates in the opposite direction as the second rotor rotates, the second rotor being positioned at substantially the same horizontal level as the first rotor;
• a deflector member extending substantially along the heights of the first and second rotors and positioned on the side of the first and second rotors facing the direction from which the fluid is flowing, the deflector member having a width less than the horizontal distance between the first central, vertically extending axis and the second central, vertically extending axis and being centered between a first plane extending through the first central, vertically extending axis of the first rotor substantially perpendicular to a line drawn through the first and second central, vertically extending axes and a plane drawn through the second central, vertically extending axis of the second rotor substantially perpendicular to the line drawn through the first and second central, vertically extending axes, the deflector member further being substantially parallel to a plane drawn through the first and second central, vertically extending axes.

A Savonius rotor assembly for interacting with a moving fluid, comprising:

• a support framework;
• a first rotor rotatably mounted on the support framework for rotation about a first central, vertically extending axis, the first rotor having a shaft, a top, a bottom, a height and at least two blades, each blade having an inner and an outer edge with respect to the first central, vertically extending axis, the blades positioned to allow fluid flow between the inner edges thereof;
• a second rotor rotatably mounted on the support framework for rotation about a second central, vertically extending axis, the second rotor having a shaft, a top, a bottom, a height and at least two blades, each blade having an inner and an outer edge with respect to the second central, vertically extending axis, the blades positioned to allow fluid flow between the inner edges thereof, the blades of the first rotor and the blades of the second rotor configured so that the first rotor rotates in the opposite direction as the second rotor rotates, the second rotor being positioned at substantially the same horizontal level as the first rotor;
• a deflector member extending substantially along the heights of the first and second rotors and positioned on the side of the first and second rotors facing the direction from which the fluid is flowing, the deflector member having a width less then the horizontal distance between the first central, vertically extending axis and the second central, vertically extending axis and being positioned so that a line drawn anywhere along the height of the surface of the deflector member facing the direction from which the fluid is flowing is a substantially vertical line, the deflector member further being symmetrical about a plane centered between the first and second central, vertically extending axes perpendicular to a plane drawn through the first and second central, vertically extending axes.