PITCH RANGE FOR A VARIABLE PITCH FAN
First Claim
1. A variable pitch fan for a propulsion device, the variable pitch fan comprising:
- a plurality of fan blades coupled to a disk, each fan blade of the plurality of fan blades extending radially outward from the disk, each fan blade extending along a span from a root to a tip, a portion of the span adjacent the root defining a root span region, a portion of the span adjacent the tip defining a tip span region,wherein each fan blade is rotatable about a pitch axis to vary a pitch of the fan blade, the pitch axis extending radially through the fan blade, the pitch variable within a pitch range, the pitch range being at least about 80°
to about 130°
, andwherein a solidity of the variable pitch fan is at least 1.0 in the root span region.
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Accused Products
Abstract
A variable pitch fan for a propulsion device is provided. The variable pitch fan includes a plurality of fan blades coupled to a disk and a rotatable front hub covering the disk. Each fan blade is rotatable about a pitch axis to vary a pitch of the fan blade. The pitch is variable within a pitch range that is at least about 80° to about 130°. Each fan blade extends radially outward from the disk along a span from a root to a tip. A portion of the span adjacent the root defines a root span region, a portion of the span adjacent the tip defines a tip span region. A solidity of the variable pitch fan is at least 1.0 in the root span region.
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Citations
20 Claims
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1. A variable pitch fan for a propulsion device, the variable pitch fan comprising:
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a plurality of fan blades coupled to a disk, each fan blade of the plurality of fan blades extending radially outward from the disk, each fan blade extending along a span from a root to a tip, a portion of the span adjacent the root defining a root span region, a portion of the span adjacent the tip defining a tip span region, wherein each fan blade is rotatable about a pitch axis to vary a pitch of the fan blade, the pitch axis extending radially through the fan blade, the pitch variable within a pitch range, the pitch range being at least about 80°
to about 130°
, andwherein a solidity of the variable pitch fan is at least 1.0 in the root span region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A variable pitch fan for a propulsion device, the variable pitch fan comprising:
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a plurality of fan blades coupled to a disk, each fan blade of the plurality of fan blades extending radially outward from the disk, each fan blade extending along a span from a root to a tip, a portion of the span adjacent the root defining a root span region, a portion of the span adjacent the tip defining a tip span region; and a rotatable front hub covering the disk, wherein a solidity of the variable pitch fan is at least 1.0 in the root span region, wherein a fan pressure ratio of the variable pitch fan is less than about 1.5, wherein a fan hub radius ratio of the variable pitch fan is less than about 0.40, and wherein each fan blade is rotatable about a pitch axis to vary a pitch of the fan blade, the pitch axis extending radially through the fan blade, the pitch variable within a pitch range, the pitch range being at least about 80°
to about 130°
. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification