Stepped leading edge fan blade
A fan blade apparatus for use in a high-volume, low-speed fan wherein the fan blade includes a body portion, a leading edge portion and a trailing portion. The fan blade coupled to an electric motor configured to rotate in an intended direction wherein the leading portion of the fan blade is at the forefront of the rotation of the blade. The leading edge portion of the fan blade includes a series of steps extending along the length of the leading edge. The stepped configuration creates turbulent air flow when the electric motor rotates in the intended direction.
1. A high-volume, low-speed fan comprising:
a fan blade mount affixed to an electromagnetic motor wherein the electromagnetic motor rotates in a single direction around an axis of rotation;
a plurality of fan blades coupled to the fan blade mount each of the plurality of fan blades having a length measureable along a longitudinal edge of the fan blade and a width measurable along an end edge of the fan blade;
a leading edge attached to the longitudinal edge of the fan blade, the leading edge comprising a first step, a second step, and a third step extending along a length of the leading edge at predetermined intervals, wherein a width of the first step is narrower than a width of the second step, and a width of the third step is narrower than the width of the second step, and a leading edge of each of the first step, the second step, and third step includes a straight portion positioned parallel to the longitudinal edge of the fan blade, and:
the first step including a foremost edge surface, the second step including a foremost edge surface, and the third step including a foremost edge surface, wherein the foremost edge surface of the first step, the foremost edge surface of the second step, and the foremost edge surface of the third step are aligned in a plane formed by a chord direction of the fan blade and a non-axial transverse direction of the fan blade;
and the first step, the second step, and the third step are each configured to create a vortex.
2. The high-volume, low-speed fan of claim 1 , wherein each of the first step, the second step, and the third step are configured to be an equal length along the leading edge of the fan blade such that each of the first step, the second step, and the third step is proportional to a total length of the leading edge of the fan blade.
3. The high-volume low-speed fan of claim 2 , wherein the first step, the second step, and the third step are configured to be an equal width along the leading edge of the fan blade such that the width of the each of the first step, the second step and the third step is proportional to an overall width of the leading edge of the fan blade, wherein each step decreases in width as the first step, the second step and the third step span at predetermined intervals from a centerline of the high-volume, low-speed fan.
4. The high-volume low-speed fan of claim 2 , a ratio of length of the first step, second, and the third step along the leading edge is 3:2:1 and a ratio of a width along the leading edge is 3:2:1.
5. The high-volume, low-speed fan of claim 4 , wherein the leading edge is made of material, from the group consisting of graphite, fiberglass, extruded polymer, high-impact polystyrene, or carbon fiber.
6. The high-volume, low speed fan of claim 1 , wherein each of the first step, the second step, and the third step are configured to be an equal width along a leading portion such that each of the first step, the second step and the third step is proportional to an overall width of the leading edge of the fan blade.
7. The high-volume, low-speed fan of claim 1 , wherein the fan blade is configured to have a pitch of between 18° to 22°.
8. A fan blade comprising:
a body portion having a hub side, an exterior side, a leading edge portion measurable along a longitudinal edge of the fan blade;
a tail portion measurable along a trailing edge portion of the fan blade;
the body portion having a width measureable between the leading edge portion and the trailing edge portion;
a leading edge comprising three steps along a length of the leading edge, wherein each step decreasing in a width edge of the fan blade between the leading edge and the trailing edge portion:
each step is configured such that a ratio of a length of each step is proportional with respect to the length of the leading edge each of the first step, the second step, and third step include a straight portion positioned parallel to the longitudinal edge of the fan blade: and
the first step including an air contact surface, the second step including an air contact surface, and the third step including an air contact surface, wherein the air contact surface of the first step, the air contact surface of the second step, and the air contact surface of the third step are aligned in a plane formed by a chord direction of the fan blade and a non-axial transverse direction of the fan blade;
and the first step, the second step, and the third step are each configured to create a vortex.
9. The fan blade of claim 8 , wherein the body portion is aluminum.
10. The fan blade of claim 9 , wherein the leading edge is made of a material, from the group consisting of fiberglass, graphite, composite plastic material, extruded polymer material, carbon fiber, or high-impact polystyrene.
11. The fan blade of claim 10 , wherein a ratio of a width of the first step, the second step, and the third step are proportional along the leading edge.