Contoured fan blades and associated systems and methods

1. A fan, comprising:

a hub; and

multiple fan blades arranged circumferentially around, and coupled to, the hub, with each fan blade having a tip, a first curved edge, and a second curved edge, the first and second curved edges extending over at least part of the length between the hub and the tip of the fan blade, wherein the first curved edge extends in a length direction of the fan blade, and repetitively varies in a direction perpendicular to the length direction and a width direction of the fan blade, by an amount greater than any repetitive variation in both the width and length directions;

wherein each of the fan blades is formed with multiple upper channels and multiple lower channels;

wherein the multiple upper channels extend from the first curved edge to the second curved edge; and

wherein the multiple lower channels extend from the first curved edge to the second curved edge.

2. The fan of claim 1 , wherein the first curved edge has a sine-wave shape.

3. The fan of claim 1 , wherein the second curved edge has a sine-wave shape.

4. The fan of claim 1 , wherein the first curved edge has a first sine-wave shape, and wherein the second curved edge has a second sine-wave shape, and wherein the first and second sine-wave shapes have the same wavelength and amplitude.

5. The fan of claim 1 , wherein the hub is configured to be rotated either in a first rotational direction or a second rotational direction opposite the first rotational direction.

6. The fan of claim 1 , wherein a shape of the first curved edge is formed from multiple sine waves.

7. The fan of claim 6 , wherein the multiple sine waves have the same amplitude.

8. The fan of claim 1 , wherein a shape of the first curved edge is formed from a first set of sine waves, and wherein a shape of the second curved edge is formed from a second set of sine waves.

9. The fan of claim 8 , wherein each sine wave of the first and second sets of sine waves has the same amplitude.

10. The fan of claim 1 , wherein each of the fan blades includes a first section, a second section, and a third section, and wherein the third section is coupled to the hub.

11. The fan of claim 10 , wherein the first section has a first width, and wherein the third section has a third width different than the first width.

12. The fan of claim 10 , wherein the first section has a first width, and wherein the second section has a second width different than the first width.

13. The fan of claim 10 , wherein the first curved edge is in the first section and the second section.

14. The fan of claim 13 , wherein the second curved edge is in the first section and the second section.

15. A fan, comprising:

a hub; and

multiple fan blades arranged circumferentially around, and coupled to, the hub, with each fan blade havinq a tip, a first curved edge, and a second curved edge, the first and second curved edges extending over at least part of the length between the hub and the tip of the fan blade;

wherein each of the fan blades is formed with multiple upper channels and multiple lower channels;

wherein the multiple upper channels extend from the first curved edge to the second curved edge;

wherein the multiple lower channels extend from the first curved edge to the second curved edge;

wherein a shape of the first curved edge is formed from multiple sine waves; and

wherein the multiple sine waves include a first sine wave having a first amplitude and a second sine wave having a second amplitude, and wherein the first amplitude is different than the second amplitude.

16. A fan, comprising:

a hub; and

multiple fan blades arranged circumferentially around, and coupled to, the hub, with each fan blade having a tip, a first curved edge, and a second curved edge, the first and second curved edges extending over at least part of the length between the hub and the tip of the fan blade;

wherein each of the fan blades is formed with multiple upper channels and multiple lower channels;

wherein the multiple upper channels extend from the first curved edge to the second curved edge;

wherein the multiple lower channels extend from the first curved edge to the second curved edge; and

wherein a shape of the first curved edge is formed from a first set of sine waves and a second set of sine waves, and wherein the first set of sine waves and the second set of sine waves have different wavelengths.

17. A fan, comprising:

a hub; and

multiple fan blades arranged circumferentially around, and coupled to, the hub, with each fan blade having a tip a first curved edge, and a second curved edge, the first and second curved edges extending over at least part of the length between the hub and the tip of the fan blade;

wherein each of the fan blades is formed with multiple upper channels and multiple lower channels;

wherein the multiple upper channels extend from the first curved edge to the second curved edge;

wherein the multiple lower channels extend from the first curved edge to the second curved edge;

wherein a shape of the first curved edge is formed from a first set of sine waves, and wherein a shape of the second curved edge is formed from a second set of sine waves; and

wherein each sine wave of the first set of sine waves has a first amplitude, and wherein each sine wave of the second set of sine waves has a second amplitude different than the first amplitude.

18. A method for manufacturing a fan, comprising:

forming a hub;

forming multiple fan blades, each fan blade having a tip, a first curved edge, and a second curved edge, the first and second curved edges extending over at least part of the length of the fan blade; and

attaching the multiple fan blades circumferentially around the hub;

wherein forming the multiple fan blades includes forming each of the fan blades with multiple upper channels and multiple lower channels, and

wherein the first curved edge extends in a length direction of the fan blade, and repetitively varies in a direction perpendicular to the length direction and a width direction of the fan blade, by an amount greater than any repetitive variation in both the width and length directions.

19. The method of claim 18 , wherein the multiple upper channels extend from the first curved edge to the second curved edge, and wherein the multiple lower channels extend from the first curved edge to the second curved edge.