Fan rotor for ram air fan
AssigneeHamilton Sundstrand Corporation
InventorsDarryl A. Colson, Roberto J. Perez
Life of this patent
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Abstract
A fan rotor for a ram air fan includes a hub and blades extending radially outwards from the hub. The hub includes an inner hub portion, a disk portion connected to a radially outer surface of the inner hub portion, and an outer hub portion connected to a radially outer surface of the disk portion. The outer hub portion has an upstream arm with a compound contoured surface. The compound contoured surface is configured to direct air flow around the compound contoured surface and along roots of the blades.
Claims20
An outer hub portion for a fan rotor, the outer hub portion comprising:
- an upstream arm with a radially inner surface, a radially outer surface opposite of the radially inner surface, and a compound contoured surface connecting the radially inner surface to the radially outer surface, wherein the compound contoured surface comprises:
- a first arcuate segment extends from the radially inner surface of the upstream arm and has a first radius R1;
- a second arcuate segment extends from the first arcuate segment and has a second radius R2;
- a chamfered segment extends from the second arcuate segment and has an angle A1;
- and
- a third arcuate segment extends from the chamfered segment to the radially outer surface and has a third radius R3;
- wherein a ratio of the first radius R1 to the second radius R2 is between 0.4545 and 0.7778;
- and
- a downstream arm opposite of the upstream arm.
An outer hub portion for a fan rotor, the outer hub portion comprising:
- an upstream arm with a radially inner surface, a radially outer surface opposite of the radially inner surface, and a compound contoured surface connecting the radially inner surface to the radially outer surface, wherein the compound contoured surface comprises:
- a first arcuate segment extends from the radially inner surface of the upstream arm and has a first radius R1;
- a second arcuate segment extends from the first arcuate segment and has a second radius R2;
- a chamfered segment extends from the second arcuate segment and has an angle A1;
- and
- a third arcuate segment extends from the chamfered segment to the radially outer surface and has a third radius R3;
- wherein a ratio of the second radius R2 to the third radius R3 is between 0.2195 and 0.2821;
- and
- a downstream arm opposite of the upstream arm.
An outer hub portion for a fan rotor, the outer hub portion comprising:
- an upstream arm with a radially inner surface, a radially outer surface opposite of the radially inner surface, and a compound contoured surface connecting the radially inner surface to the radially outer surface, wherein the compound contoured surface comprises:
- a first arcuate segment extends from the radially inner surface of the upstream arm and has a first radius R1;
- a second arcuate segment extends from the first arcuate segment and has a second radius R2;
- a chamfered segment extends from the second arcuate segment and has an angle A1;
- and
- a third arcuate segment extends from the chamfered segment to the radially outer surface and has a third radius R3;
- wherein the angle A1 of the chamfered section is between 19.5 degrees and 20.5 degrees;
- and
- a downstream arm opposite of the upstream arm.
Dependencies are inferred from the claim text.