WO1996016272B1 - Fan blade with curved planform and high-lift airfoil having bulbous leading edge - Google Patents
Fan blade with curved planform and high-lift airfoil having bulbous leading edgeInfo
- Publication number
- WO1996016272B1 WO1996016272B1 PCT/US1995/014883 US9514883W WO9616272B1 WO 1996016272 B1 WO1996016272 B1 WO 1996016272B1 US 9514883 W US9514883 W US 9514883W WO 9616272 B1 WO9616272 B1 WO 9616272B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- airfoil
- blade
- nose section
- fan assembly
- Prior art date
Links
- 210000001331 Nose Anatomy 0.000 claims abstract 36
- 239000000203 mixture Substances 0.000 claims abstract 16
- 238000001816 cooling Methods 0.000 claims abstract 5
- 238000002156 mixing Methods 0.000 claims 6
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 claims 1
- 229910052705 radium Inorganic materials 0.000 claims 1
Abstract
A blade (100) for a vehicle engine-cooling fan assembly having a curved planform and a high-lift airfoil. The planform has a first region adjacent the root of the blade with forward curvature, a second region ajdacent the tip of the blade with backward curvature, and an intermediate region disposed between the first region and the second region with substantially straight curvature. The airfoil has a leading edge (106); a rounded, bulbous nose section (110) adjacent the leading edge (108); a trailing edge; a curved pressure surface (104) extending smoothly and without discontinuity from the nose section to the trailing edge; a curved suction surface (102) extending smoothly and without discontinuity from the nose section (110) to the trailing edge; and a thin, highly cambered aft section (112) formed adjacent the trailing edge (108) and between the pressure surface (104) and the suction surface (102). The nose section (110) has a thickness which is greater than the thickness of the airfoil between the pressure surface (104) and the suction surface (102) and the nose section (110) blends smoothly into the pressure surface (104) and the suction surface (102).
Claims
1. (Amended) An airfoil defining the shape of the blades of a vehicle engine-cooling fan assembly and comprising:
an unpointed leading edge;
a rounded, bulbous nose section adjacent said leading edge;
a trailing edge;
a continuously curved pressure surface extending smoothly, without discontinuity, and without a planar portion from said nose section to said trailing edge;
a continuously curved suction surface extending smoothly and without discontinuity from said nose section to said trailing edge; and
a thin, highly cambered aft section formed adjacent said trailing edge and between said pressure surface and said suction surface, said aft section having a location of maximum camber;
said nose section having a thickness which is greater than the thickness of said airfoil between said pressure surface and said suction surface and said nose section blending smoothly into said pressure surface via a first blend radius and a second blend radius approximately equal to said first blend radium and into said suction surface, said first blend radius forming a convex surface extending from said nose section adjacent said leading edge and said second radius forming a concave surface extending from said convex surface to said pressure surface of said airfoil.
2. (Cancelled)
3. (Cancelled)
4. (Cancelled)
5. (Amended) The airfoil according to claim 1 wherein said airfoil has a chord and said blend radii are no less than about 8% of said chord. 3 8
6. The airfoil according to claim S wherein said blend radii form a gradual transition region between said nose section and said pressure surface of said airfoil.
7. The airfoil according to claim 6 wherein said gradual transition region has a midpoint and the angle formed between the tangent to said nose section adjacent said pressure surface and the tangent to said midpoint of said gradual transition region is between 20 and 28°.
8. The airfoil according to claim 1 wherein the blades having said airfoil have a straight planform.
9. The airfoil according to claim 1 wherein the blades having said airfoil have a highly-curved planform.
10. The airfoil according to claim 1 wherein said airfoil has a chord and said camber at said location of maximum camber of said aft section is between 5 and 12% of said chord.
11. (Amended) An airfoil defining the shape of the blades of a vehicle engine-cooling fan assembly, having a chord, and comprising:
an unpointed leading edge;
a rounded, bulbous nose section adjacent said leading edge;
a trailing edge;
a continuously curved pressure surface extending smoothly, without discontinuity, and without a planar portion from said nose section to said trailing edge;
a continuously curved suction surface extending smoothly and without discontinuity from said nose section to said trailing edge; and
a thin aft section formed adjacent said trailing edge and between said pressure surface and said suction surface, said aft section having a location of maximum camber and a camber at said location of between 5 and 12% of said chord of said airfoil; said nose section having a thickness which is approximately twice as great as the thickness of said aft section, blending smoothly into said suction surface, and blending smoothly into said pressure surface via a first blend radius forming a convex surface extending from said nose section adjacent said leading edge and a second blend radius forming a concave surface extending from said convex surface to said pressure surface of said airfoil, said blend radii being approximately equal.
12. (Amended) The airfoil according to claim 11 wherein said blend radii are no less than about 8% of said chord.
13. The airfoil according to claim 12 wherein said blend radii form a gradual transition region between said nose section and said pressure surface of said airfoil, said gradual transition region having a midpoint and the angle formed between the tangent to said nose section adjacent said pressure surface and the tangent to said midpoint of said gradual transition region is between 20 and 28°.
14. The airfoil according to claim 11 wherein the blades having said airfoil have a straight planform.
15. The airfoil according to claim 11 wherein the blades having said airfoil have a highly-curved planform.
16. (Amended) A vehicle fan assembly for circulating air to cool an engine, said fan assembly comprising:
a central hub; and
a plurality of blades with an airfoil and extending generally radially outward from said hub, each said airfoil having:
(a) an unpointed leading edge;
(b) a rounded, bulbous nose section adjacent said leading edge;
(c) a trailing edge; (d) a continuously curved pressure surface extending smoothly, without discontinuity, and without a planar portion from said nose section to said trailing edge;
(e) a continuously curved suction surface extending smoothly and without discontinuity from said nose section to said trailing edge; and
(f) a thin, highly cambered aft section formed adjacent said trailing edge and between said pressure surface and said suction surface;
said nose section having a thickness which is greater than the thickness of said airfoil between said pressure surface and said suction surface and said nose section blending smoothly into said pressure surface via a first blend radius and a second blend radius approximately equal to said first blend radius and into said suction surface, said first blend radius forming a convex surface extending from said nose section adjacent said leading edge and said second radius forming a concave surface extending from said convex surface to said pressure surface of said airfoil.
17. The vehicle fan assembly according to claim 16 further comprising an outer ring, said blades extending generally radially outward from said hub to said ring.
18. The vehicle fan assembly according to claim 17 wherein said ring has an axial depth of about 23 mm.
19. The vehicle fan assembly according to claim 16 wherein said blades have a straight planform.
20. The vehicle fan assembly according to claim 16 wherein said blades have a highly-curved planform.
21. (Amended) A planform defining the shape of blades of a vehicle engine-cooling fan assembly, each blade having a root, a tip, and a span between die root and tip, said planform comprising:
a first region adjacent the root of the blade having forward curvature;
a second region adjacent the tip of the blade having backward curvature; and 4 1
an intermediate region disposed between said first region and said second region having substantially straight curvature.
22. (Amended) The planform according to claim 21 wherein said first region having forward curvature extends from the root to a terminus located about forty- percent of the span of the blade.
23. (Amended) The planform according to claim 22 wherein said intermediate region having substantially straight curvature extends from said terminus of said first region to an end point located about sixty-percent of the span of the blade and said second region having backward curvature extends from said end point of said intermediate region to the tip of the blade.
24. (Amended) The planform according to claim 21 wherein said second region having backward curvature extends from the tip to an end point of said intermediate region located between about sixty and seventy-percent of the span of the blade.
25. A vehicle fan assembly for circulating air to cool an engine, said fan assembly comprising:
a central hub; and
a plurality of blades with a planform, a root joined to said hub, a tip, and a span between said root and said tip, said blades extending generally radially outward from said hub and each said planform having:
(a) a first region adjacent said root of said blade with forward curvature;
(b) a second region adjacent said tip of said blade with backward curvature; and
(c) an intermediate region disposed between said first region and said second region with substantially straight curvature. 42
26. The vehicle fan assembly according to claim 25 further comprising an outer ring, said blades extending generally radially outward from said hub to said ring.
27. The vehicle fan assembly according to claim 26 wherein said ring has an axial depth of about 23 mm.
28. (Amended) The vehicle fan assembly according to claim 25 wherein said first region with forward curvature extends from said root to a terminus located about forty-percent of said span of said blade.
29. (Amended) The vehicle fan assembly according to claim 28 wherein said intermediate region with substantially straight curvature extends from said terminus of said first region to an end point located about sixty-percent of said span of said blade and said second region with backward curvature extends from said end point of said intermediate region to said tip of said blade.
30. (Amended) The vehicle fan assembly according to claim 25 wherein said second region with backward curvature extends from said tip to an end point of said intermediate region located between about sixty and seventy-percent of said span of said blade.
31. (Amended) A blade for a vehicle engine-cooling fan assembly composing:
a root;
a tip;
a span between said root and said tip;
a planform having:
(a) a first region adjacent said root of said blade with forward curvature,
(b) a second region adjacent said tip of said blade with backward curvature, and 43
(c) an intermediate region disposed between said first region and said second region with substantially straight curvature; and
an airfoil section having:
(a) a leading edge,
(b) a rounded, bulbous nose section adjacent said leading edge,
(c) a trailing edge,
(d) a curved pressure surface extending smood ly and without discontinuity from said nose section to said trailing edge,
(e) a curved suction surface extending smoothly and without discontinuity from said nose section to said trailing edge, and
(f) a thin, highly cambered aft section formed adjacent said trailing edge and between said pressure surface and said suction surface, said aft section having a location of maximum camber,
said nose section having a thickness which is greater than the thickness of said airfoil section between said pressure surface and said suction surface and said nose section blending smoothly into said pressure surface and said suction surface.
32. (Amended) The blade according to claim 31 wherein said first region with forward curvature extends from said root to a terminus located about forty- percent of said span of said blade.
33. (Amended) The blade according to claim 32 wherein said intermediate region with substantially straight curvature extends from said terminus of said first region to an end point located about sixty-percent of said span of said blade and said second region with backward curvature extends from said end point of said intermediate region to said tip of said blade. 44
34. (Amended) The blade according to claim 31 wherein said second region with backward curvature extends from said tip to an end point of said intermediate region located between about sixty and seventy-percent of said span of said blade.
35. (Amended) A vehicle fan assembly for circulating air to cool an engine, said fan assembly comprising:
a central hub; and
a plurality of blades, each blade having:
(a) a root,
(b) a tip,
(c) a span between said root and said tip,
(d) a planform including:
(1) a first region adjacent said root of said blade with forward curvature;
(2) a second region adjacent said tip of said blade with backward curvature; and
(3) an intermediate region disposed between said first region and said second region with substantially straight curvature, and
(e) an section airfoil including:
(1) a leading edge;
(2) a rounded, bulbous nose section adjacent said leading edge;
(3) a trailing edge;
(4) a curved pressure surface extending smoothly and without discontinuity from said nose section to said trailing edge; 45
(5) a curved suction surface extending smoothly and widiout discontinuity from said nose section to said trailing edge; and
(6) a thin, highly cambered aft section formed adjacent said trailing edge and between said pressure surface and said suction surface, said aft section having a location of maximum camber,
said nose section having a thickness which is greater than the thickness of said airfoil section between said pressure surface and said suction surface and said nose section blending smoothly into said pressure surface and said suction surface.
36. The vehicle fan assembly according to claim 35 further comprising an outer ring, said blades extending generally radially outward from said hub to said ring.
37. The vehicle fan assembly according to claim 36 wherein said ring has an axial depth of about 23 mm.
38. (Amended) The vehicle fan assembly according to claim 35 wherein said first region with forward curvature extends from said root to a terminus located about forty-percent of said span of said blade.
39. (Amended) The vehicle fan assembly according to claim 38 wherein said intermediate region with substantially straight curvature extends from said terminus of said first region to an end point located about sixty-percent of said span of said blade and said second region with backward curvature extends from said end point of said intermediate region to said tip of said blade.
40. (Amended) The vehicle fan assembly according to claim 35 wherein said second region with backward curvature extends from said tip to an end point of said intermediate region located between about sixty and seventy-percent of said span of said blade.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8516966A JPH10510021A (en) | 1994-11-18 | 1995-11-15 | Cooling fan blades with a high lift airfoil with a bulbous leading edge and a curved planar shape |
| DE69520963T DE69520963T2 (en) | 1994-11-18 | 1995-11-15 | CURVED FAN BLADES AND HIGH-FLOATING SUPPORT BLADE PROFILE WITH THICKEN FLOWING EDGE |
| AT95941403T ATE201253T1 (en) | 1994-11-18 | 1995-11-15 | CURVED FAN BLADE AND HIGH-LIFT WING PROFILE WITH THICKENED FLAWING EDGE |
| EP95941403A EP0839286B1 (en) | 1994-11-18 | 1995-11-15 | Fan blade with curved planform and high-lift airfoil having bulbous leading edge |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/342,358 | 1994-11-18 | ||
| US08/342,358 US5588804A (en) | 1994-11-18 | 1994-11-18 | High-lift airfoil with bulbous leading edge |
| US08/471,270 US5624234A (en) | 1994-11-18 | 1995-06-06 | Fan blade with curved planform and high-lift airfoil having bulbous leading edge |
| US08/471,270 | 1995-06-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996016272A1 WO1996016272A1 (en) | 1996-05-30 |
| WO1996016272B1 true WO1996016272B1 (en) | 1996-08-15 |
Family
ID=26992971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/014883 WO1996016272A1 (en) | 1994-11-18 | 1995-11-15 | Fan blade with curved planform and high-lift airfoil having bulbous leading edge |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5624234A (en) |
| EP (1) | EP0839286B1 (en) |
| JP (1) | JPH10510021A (en) |
| AT (1) | ATE201253T1 (en) |
| DE (1) | DE69520963T2 (en) |
| WO (1) | WO1996016272A1 (en) |
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| US5352092A (en) * | 1993-11-24 | 1994-10-04 | Westinghouse Electric Corporation | Light weight steam turbine blade |
| US5454695A (en) * | 1994-07-05 | 1995-10-03 | Ford Motor Company | High output engine cooling fan |
-
1995
- 1995-06-06 US US08/471,270 patent/US5624234A/en not_active Expired - Lifetime
- 1995-11-15 DE DE69520963T patent/DE69520963T2/en not_active Expired - Lifetime
- 1995-11-15 JP JP8516966A patent/JPH10510021A/en not_active Ceased
- 1995-11-15 WO PCT/US1995/014883 patent/WO1996016272A1/en active Search and Examination
- 1995-11-15 AT AT95941403T patent/ATE201253T1/en not_active IP Right Cessation
- 1995-11-15 EP EP95941403A patent/EP0839286B1/en not_active Expired - Lifetime
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