CA2719755A1 - Fan blades - Google Patents
Fan blades Download PDFInfo
- Publication number
- CA2719755A1 CA2719755A1 CA2719755A CA2719755A CA2719755A1 CA 2719755 A1 CA2719755 A1 CA 2719755A1 CA 2719755 A CA2719755 A CA 2719755A CA 2719755 A CA2719755 A CA 2719755A CA 2719755 A1 CA2719755 A1 CA 2719755A1
- Authority
- CA
- Canada
- Prior art keywords
- fan blade
- ellipse
- curvature
- top surface
- generally elliptical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 claims 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
Classifications
-
- Y02B60/50—
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A fan blade comprises an airfoil having a generally elliptical top surface and a generally elliptical bottom surface. The fan blade has a lower radius of curvature toward its leading edge as compared to a higher radius of curvature toward its trailing, edge. When mounted to a rotating hub member, elliptical fan blades may provide air movement at significant efficiencies.
Claims (20)
1. A fan blade configured to mount to a rotating fan hub, the fan blade comprising:
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a first ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
(c) a leading edge, wherein the top surface and bottom surface each terminate at the leading edge; and (d) a trailing edge, wherein the top surface and bottom surface each terminate at the trailing edge.
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a first ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
(c) a leading edge, wherein the top surface and bottom surface each terminate at the leading edge; and (d) a trailing edge, wherein the top surface and bottom surface each terminate at the trailing edge.
2. The fan blade of claim 1, further comprising: a first radius of curvature proximate the leading edge, and a second radius of curvature proximate the trailing edge, wherein the first radius of curvature is lower than the second radius of curvature.
3. The fan blade of claim 3, wherein the curvature of the second ellipse is dependent on the curvature of the first ellipse.
4. The fan blade of claim 1, wherein the fan blade is substantially hollow.
5. The fan blade of claim 1, wherein the fan blade is configured to receive a mounting member of a fan hub.
6. The fan blade of claim 5, wherein the fan blade is secured to the fan hub by at least one fastener.
7. The fan blade of claim 1, wherein the fan blade has a chord and a maximum thickness, wherein the maximum thickness is approximately 14.2% of the chord.
8. The fan blade of claim 1, wherein fan blade has a chord and a maximum camber, wherein the maximum camber is approximately 15.6% of the chord.
9. The fan blade of claim 1, wherein the fan blade is mounted to a hub at an angle of attack between approximately -1° and approximately 13°, inclusive.
10. The fan blade of claim 1, wherein the fan blade is formed of extruded aluminum.
11. The fan blade of claim 1, wherein the fan blade has a length between approximately 4 feet and approximately 14 feet, inclusive.
12. The fan blade of claim 1, wherein the fan blade has a uniform cross section along the entire length of the fan blade.
13. The fan blade of claim 1, wherein the fan blade has a hub mounting end, wherein an oblique cut is formed in the leading edge of the fan blade at the hub mounting end.
14. The fan blade of claim 1, wherein the fan blade is substantially straight along the entire length of the fan blade.
15. The fan blade of claim 1, wherein the first ellipse is generated based at least in part on the following equations:
[1] x = a(COS(t)), and [2) y = b(SIN(t)), wherein x and y provide an x-y plot of the first ellipse, wherein a = length of a primary radius, wherein b = length of a secondary radius, and wherein t = angle of rotation of a radius about an origin.
[1] x = a(COS(t)), and [2) y = b(SIN(t)), wherein x and y provide an x-y plot of the first ellipse, wherein a = length of a primary radius, wherein b = length of a secondary radius, and wherein t = angle of rotation of a radius about an origin.
16. The fan blade of claim 15, wherein the second ellipse is generated based at least in part on the following equations:
[3] x2 = x(COS(.THETA.))-y(SIN(.THETA.)), and [4] y2 = y(COS(.THETA.))-x(SIN(.THETA.)), wherein x2 and y2 provide an x-y plot of the second ellipse, wherein x and y are the same x and y obtained using equations [1] and [2], and wherein .THETA. = a degree to which the first ellipse is rotated about the origin.
[3] x2 = x(COS(.THETA.))-y(SIN(.THETA.)), and [4] y2 = y(COS(.THETA.))-x(SIN(.THETA.)), wherein x2 and y2 provide an x-y plot of the second ellipse, wherein x and y are the same x and y obtained using equations [1] and [2], and wherein .THETA. = a degree to which the first ellipse is rotated about the origin.
17. The fan blade of claim 16, wherein 0 is approximately 0.525 radians.
18. The fan blade of claim 1, wherein the first ellipse and the second ellipse intersect at four intersection points when the first ellipse and the second ellipse are plotted on a common graph, wherein the generally elliptical curvature of the top surface and the generally elliptical curvature of the bottom surface are based on the curvature of the first ellipse and the second ellipse, respectively, in a region between a pair of the intersection points.
19. A fan blade configured to mount to a rotating fan hub, the fan blade comprising:
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a lint ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
wherein the first ellipse and the second ellipse intersect at four intersection points when the first ellipse and the second ellipse are plotted on a common graph, wherein the generally elliptical curvature of the top surface and the generally elliptical curvature of the bottom surface are based on the curvature of the first ellipse and the second ellipse, respectively, in a region between an adjacent pair of the intersection points.
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a lint ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
wherein the first ellipse and the second ellipse intersect at four intersection points when the first ellipse and the second ellipse are plotted on a common graph, wherein the generally elliptical curvature of the top surface and the generally elliptical curvature of the bottom surface are based on the curvature of the first ellipse and the second ellipse, respectively, in a region between an adjacent pair of the intersection points.
20. A fan blade configured to mount to a rotating fan hub, the fan blade comprising:
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a first ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
wherein the formation of the second ellipse is based on the formation of the first ellipse.
(a) a top surface having a generally elliptical curvature, wherein the curvature of the top surface is based on a first ellipse;
(b) a bottom surface having a generally elliptical curvature, wherein the curvature of the bottom surface is based on a second ellipse;
wherein the formation of the second ellipse is based on the formation of the first ellipse.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58994504P | 2004-07-21 | 2004-07-21 | |
| US60/589,945 | 2004-07-21 | ||
| CA2574762A CA2574762C (en) | 2004-07-21 | 2005-01-28 | Fan blades and modifications |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2574762A Division CA2574762C (en) | 2004-07-21 | 2005-01-28 | Fan blades and modifications |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2719755A1 true CA2719755A1 (en) | 2006-03-02 |
| CA2719755C CA2719755C (en) | 2011-11-29 |
Family
ID=43303768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2719755A Active CA2719755C (en) | 2004-07-21 | 2005-01-28 | Fan blades |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2719755C (en) |
-
2005
- 2005-01-28 CA CA2719755A patent/CA2719755C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2719755C (en) | 2011-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |