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Patent US3904308A successfully refreshed from Google Patents.
US3904308A
Expired / Lapsed
US
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Supersonic centrifugal compressors
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1974-05-13
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Granted: 1975-09-09
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Expires: 1994-05-13
Abstract
Abstract A supersonic centrifugal compressor comprises a rotor located in a housing having a fluid intake eye. The fluid (air for instance) successively travels through an intake region wherein the rotor has a small number of blades which deflect the fluid tangentially by a small amount only, then through a compression region wherein the rotor has a higher number of blades producing tangential and meridian flow deflection. Last, the fluid flows substantially radially with respect to the rotor into a stationary diffuser.
Inventors
- 👤 Yves Ribaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
F; F04; F04D; F04D21/00; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D29/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
219 words
A supersonic centrifugal compressor comprising a rotor provided with at least first blades and second blades and with a stationary diffuser surrounding the rotor and carried by a housing having at least one axial fluid inlet, wherein said rotor and housing limit an intake region, a compression region and a radial flow region through which the fluid flows successively and wherein said blades each have a tip portion and a root portion and extend continuously from a leading edge to a trailing edge, the trailing edges of all said blades being located in said radial flow region, said intake region extending from the leading edges of said first blades to the leading edges of said second blades, said second blades being shorter than the first blades, said first blades having a stag variation in the intake region which is such as to produce a tangential fluid deflection which is small as compared with the tangential flow deflection in the compression region, and having a substantial stag at their leading edges, said first and second blades being so shaped in the compression region as to produce the major portion of the tangential flow deflection and azimuthal flow deflection, and said first and second blades having trailing end portions directed radially with respect to the rotor in said radial flow region.
Claim 2
Dependent Claim
219 words
A supersonic centrifugal compressor comprising a rotor provided with at least first blades and second blades and with a stationary diffuser surrounding the rotor and carried by a housing having at least one axial fluid inlet, wherein said rotor and housing limit an intake region, a compression region and a radial flow region through which the fluid flows successively and wherein said blades each have a tip portion and a root portion and extend continuously from a leading edge to a trailing edge, the trailing edges of all said blades being located in said radial flow region, said intake region extending from the leading edges of said first blades to the leading edges of said second blades, said second blades being shorter than the first blades, said first blades having a stag variation in the intake region which is such as to produce a tangential fluid deflection which is small as compared with the tangential flow deflection in the compression region, and having a substantial stag at their leading edges, said first and second blades being so shaped in the compression region as to produce the major portion of the tangential flow deflection and azimuthal flow deflection, and said first and second blades having trailing end portions directed radially with respect to the rotor in said radial flow region.
Claim 3
Dependent Claim
52 words
A compressor according to claim 1, wherein the deflection along the upper surfaces of the blades between the intake and the orthogonal projection of the leading edge of the next blade is about 7* at the tip of the blade, and the divergence between the tips of adjacent blades is about 7*.
Claim 4
Dependent Claim
39 words
A compressor according to claim 1, wherein the diffuser comprises a vaneless diffuser surrounded by a vaned diffuser and the ratio of the outer diameter of the vaneless diffuser to the rotor outlet diameter is between 1.15 and 1.30.
Claim 5
Dependent Claim
29 words
A compressor according to claim 1, wherein in the radial flow region, the rotor has third blades whose leading edges are located at the outlet of the compression region.
Claim 6
Dependent Claim
31 words
A compressor according to Claim 4, wherein the thickness of the first blades increases from their leading edges up to a cross-section level with the leading edges of the second blades.
Claim 7
Dependent Claim
35 words
A compressor according to claim 4, wherein the rotor has from six to 12 first blades, from 24 to 32 blades in the compression region, and at least 36 blades in the radial flow region.
Claim 8
Dependent Claim
28 words
A compressor according to claim 1, wherein the absolute outlet angle of the fluid from the rotor is between 6* and 12* with respect to the tangential direction.
Claim 9
Dependent Claim
33 words
A compressor according to claim 7, wherein the diffuser has vanes and the angular position of the diffuser vanes can be adjusted so as to alter the cross-section of throats of said diffuser.
Claim 10
Dependent Claim
23 words
A compressor according to claim 1, wherein the hub ratio in the compressor intake cross-section is of the order of 2 to 2.2.
Claim 11
Dependent Claim
29 words
A compressor according to claim 1, wherein the stag angle of the leading edges of the rotor blades at the tip of the blades is from 60* to 65*.
Claim 12
Dependent Claim
32 words
A compressor according to claim 4, wherein the rotor consists of an upstream wheel bearing a front fraction of the first blades, and a wheel which carries the balance of the blades.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |