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US3724968A
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US
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Axial supersonic compressor
Assignee: Alcatel CIT SA
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Filing: 1971-03-23
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Granted: 1973-04-03
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Expires: 1991-03-23
Abstract
Abstract An axial supersonic fluid compressor has ducts incorporating both mobile and fixed blades that are designed to receive essentially normal shock waves. This is accomplished by having the angles of incidence upstream from the fixed and mobile blades relatively small; the passage cross sections of the ducts between the blades of the mobile wheel convergent; the passage cross sections of the ducts between the fixed blades divergent, and the profile of the leading edges of the fixed and mobile blades rounded off with a small radius of curvature.
Inventors
- 👤 Jean-Marie Friberg
- 👤 Pierre Maginot
- 👤 Jean-Marie Merigoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:28
CPC Classifications
F; F04; F04D; F04D21/00; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/544; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
284 words
A supersonic axial flow fluid compressor comprising means defining a fluid inlet opeNing, including a cylindrical sleeve and an internally-mounted cap diverging in the downstream flow direction; a compressor housing; a mobile wheel rotatably mounted in said compressor housing, said mobile wheel having relatively thin pumping blades mounted thereon, said thin pumping blades having a leading and a trailing edge; means for rotatably driving the mobile wheel; distributing means including a plurality of fixed blades mounted in the fluid inlet opening upstream of the mobile wheel, said fixed blades having a leading edge and a trailing edge; a plurality of first fixed blades mounted downstream of the mobile wheel, each of said first fixed blades mounted downstream of said wheel having a leading edge and a trailing edge, the angles of incidence of the fixed blades upstream and downstream of the mobile wheel and the blades of the mobile wheel with the direction of flow of fluid being relatively small within the range of 0*-10*, the cross-sectional thickness of the blades on the mobile wheel increasing in the direction of the trailing edges to cause the cross-sectional flow area between the blades of the mobile wheel to be convergent in the direction of the trailing edges, the cross-sectional thickness of the fixed blades of both sets decreasing toward the trailing edges thereof to cause the cross-sectional flow area between the fixed blades to be divergent toward the trailing edges thereof, the profile of the leading edges of the fixed and mobile blades being rounded off with a small radius of curvature, whereby essentially normal shock waves at right angles to the direction of fluid flow are produced with a minimum of boundary flow separation.
Claim 2
Dependent Claim
284 words
A supersonic axial flow fluid compressor comprising means defining a fluid inlet opeNing, including a cylindrical sleeve and an internally-mounted cap diverging in the downstream flow direction; a compressor housing; a mobile wheel rotatably mounted in said compressor housing, said mobile wheel having relatively thin pumping blades mounted thereon, said thin pumping blades having a leading and a trailing edge; means for rotatably driving the mobile wheel; distributing means including a plurality of fixed blades mounted in the fluid inlet opening upstream of the mobile wheel, said fixed blades having a leading edge and a trailing edge; a plurality of first fixed blades mounted downstream of the mobile wheel, each of said first fixed blades mounted downstream of said wheel having a leading edge and a trailing edge, the angles of incidence of the fixed blades upstream and downstream of the mobile wheel and the blades of the mobile wheel with the direction of flow of fluid being relatively small within the range of 0*-10*, the cross-sectional thickness of the blades on the mobile wheel increasing in the direction of the trailing edges to cause the cross-sectional flow area between the blades of the mobile wheel to be convergent in the direction of the trailing edges, the cross-sectional thickness of the fixed blades of both sets decreasing toward the trailing edges thereof to cause the cross-sectional flow area between the fixed blades to be divergent toward the trailing edges thereof, the profile of the leading edges of the fixed and mobile blades being rounded off with a small radius of curvature, whereby essentially normal shock waves at right angles to the direction of fluid flow are produced with a minimum of boundary flow separation.
Claim 3
Dependent Claim
33 words
A compressor as in claim 1 where the fluid inlet opening is a ring-shaped conduit and the angle of the mobile blades at their leading edge is about 10* with the fluid flow.
Claim 4
Dependent Claim
35 words
A compressor as in claim 2 where the fixed blades are short, the cross-sectional flow area between the fixed blades being divergent toward the trailing edges thereof so that essentially normal shock waves are produced.
Claim 5
Dependent Claim
53 words
A compressor as in claim 2 where the cross-sectional flow area between the fixed blades has a slightly divergent passage cross section in the direction of the trailing edges thereof, the lengths of the blades between the leading and trailing edges being of sufficient length so that a progressive flow transformation is produced.
Claim 6
Dependent Claim
36 words
A compressor as in claim 2 where the radius of curvature of the profile of the leading edges of the first fixed blades and mobile blades is about 0.5 percent of the chord of the blades.
Claim 7
Dependent Claim
101 words
A compressor as in claim 2, wherein the surface profile of each of said blades of said rotating wheel between said leading and trailing edges thereof is defined by an infinite number of points where the successive angles formed between the tangent at each point on the profile of the blades and a common reference direction are such that the product of the ratios of the relative input speed of the fluid with respect to the blades at a critical speed of sound in the fluid at the input and at the output of each stage of blades is near unity.
Claim 8
Dependent Claim
30 words
A compressor as in claim 6 further including means to slow the speed of the fluid including a second set of fixed blades mounted downstream of the first fixed blades.
Claim 9
Dependent Claim
34 words
A compressor as in claim 7 where the first fixed blades and the second set of fixed blades have staggered profiles with respect to each other to straighten the direction of the fluid flow.
Claim 10
Dependent Claim
26 words
A compressor as in claim 8, further including a supersonic centrifugal compressor connected in the air flow stream downstream of the second set of fixed 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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |