US5110285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic burner
Assignee: Praxair Technology Inc
•
Filing: 1990-12-17
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Granted: 1992-05-05
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Expires: 2010-12-17
Abstract
Abstract Method and apparatus for changing the direction of a fluid stream injected into a combustion zone wherein a flow of biasing fluid is provided to a high velocity fuel or oxidant stream in a perpendicular direction proximate the inlet of an outwardly tapered cavity, causing the fluid stream to be deflected toward a wall of the cavity and to flow in a direction along the wall by a pressure differential across the fluid stream.
Inventors
- 👤 William J. Snyder
- 👤 John E. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:26
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/38; F23D14/00; F23D14/32; F23D14/20; F23D14/22; Y; Y10; Y10S; Y10S239/00; Y10S239/07
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
181 words
Apparatus for changing the flow direction of a high velocity fluid stream injected into a combustion zone comprising: (A) a fluidic cavity having a restricted flow area communicating downstream thereof with an expanded flow area, said restricted flow area having a diameter D at said point of communication sufficient to enable fluid passing therethrough to have a supersonic velocity, said expanded flow area having a length of from 3 D to 9 D, so as to establish a reduced pressure zone adjacent a portion of the surface of the fluidic cavity; and (B) means for providing biasing fluid into the fluidic cavity in a direction substantially perpendicular to the axial centerline of the fluidic cavity, said means having a diameter d such that d/D is within the range of from 0.18 to 0.75, said biasing fluid provision means communicating with the fluidic cavity at a point within the range of from 3d/4 upstream to d/4 downstream of the point of communication between the restricted flow area and the expanded flow area, where D and d are measured in the same units.
Claim 2
Dependent Claim
181 words
Apparatus for changing the flow direction of a high velocity fluid stream injected into a combustion zone comprising: (A) a fluidic cavity having a restricted flow area communicating downstream thereof with an expanded flow area, said restricted flow area having a diameter D at said point of communication sufficient to enable fluid passing therethrough to have a supersonic velocity, said expanded flow area having a length of from 3 D to 9 D, so as to establish a reduced pressure zone adjacent a portion of the surface of the fluidic cavity; and (B) means for providing biasing fluid into the fluidic cavity in a direction substantially perpendicular to the axial centerline of the fluidic cavity, said means having a diameter d such that d/D is within the range of from 0.18 to 0.75, said biasing fluid provision means communicating with the fluidic cavity at a point within the range of from 3d/4 upstream to d/4 downstream of the point of communication between the restricted flow area and the expanded flow area, where D and d are measured in the same units.
Claim 3
Dependent Claim
23 words
The apparatus of claim 1 wherein the expanded flow area of the fluidic cavity has an inner surface which has a conical shape.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein the expanded flow area of the fluidic cavity has an inner surface which is curved.
Claim 5
Dependent Claim
36 words
The apparatus of claim 1 wherein the biasing fluid provision means provides biasing fluid into the fluidic cavity at or upstream of the point of communication between the restricted flow area and the expanded flow area.
Claim 6
Dependent Claim
17 words
The apparatus of claim 1 wherein the biasing fluid provision means comprises a plurality of injection points.
Claim 7
Dependent Claim
20 words
The apparatus of claim 5 wherein the number of injection points is within the range of from 2 to 8.
Claim 8
Dependent Claim
9 words
The apparatus of claim 1 employed within a burner.
Claim 9
Dependent Claim
9 words
The apparatus of claim 1 employed within a lance.
Claim 10
Dependent Claim
16 words
The apparatus of claim 1 wherein d/D is within the range of from 0.18 to 0.25.
Claim 11
Dependent Claim
35 words
The apparatus of claim 1 wherein the surface of the expanded flow area forms an angle with the axial centerline of the fluidics cavity which is within the range of from 10 to 30 degrees.
Claim 12
Dependent Claim
178 words
Method for changing the flow direction of a high velocity main fluid stream injected into a combustion zone comprising: (A) providing a flow of main fluid through a fluidic cavity having a restricted flow area of diameter D communicating downstream thereof with an expanded flow area wherein the main fluid flows through the restricted flow area at a supersonic velocity and through the expanded flow area for a length of from 3 D to 9 D to establish a reduced pressure zone adjacent a portion of the surface of the fluidic cavity; (B) injecting a biasing fluid stream having a diameter d into the fluidic cavity at the reduced pressure zone in a direction substantially perpendicular to the flow direction of the main fluid passing through the restricted flow area at a point within the range of from 3d/4 upstream to d/4 downstream of the point of communication between the restricted flow area and the expanded flow area, where D and d are measured in the same units; and (C) changing the flow direction of the main fluid.
Claim 13
Dependent Claim
178 words
Method for changing the flow direction of a high velocity main fluid stream injected into a combustion zone comprising: (A) providing a flow of main fluid through a fluidic cavity having a restricted flow area of diameter D communicating downstream thereof with an expanded flow area wherein the main fluid flows through the restricted flow area at a supersonic velocity and through the expanded flow area for a length of from 3 D to 9 D to establish a reduced pressure zone adjacent a portion of the surface of the fluidic cavity; (B) injecting a biasing fluid stream having a diameter d into the fluidic cavity at the reduced pressure zone in a direction substantially perpendicular to the flow direction of the main fluid passing through the restricted flow area at a point within the range of from 3d/4 upstream to d/4 downstream of the point of communication between the restricted flow area and the expanded flow area, where D and d are measured in the same units; and (C) changing the flow direction of the main fluid.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein the main fluid is an oxidant.
Claim 15
Dependent Claim
17 words
The method of claim 11 wherein the main fluid and the biasing fluid are the same species.
Claim 16
Dependent Claim
16 words
The method of claim 11 wherein both the main fluid and the biasing fluid are gaseous.
Claim 17
Dependent Claim
30 words
The method of claim 11 wherein the flow rate of the biasing fluid is within the range of from 0.5 to 3.0 percent of the flowrate of the main fluid.
Claim 18
Dependent Claim
33 words
The method of claim 11 wherein the biasing fluid is injected into the fluidic cavity at or upstream of the point of communication between the restricted flow area and the expanded flow area.
Claim 19
Dependent Claim
25 words
The method of claim 14 further comprising entraining fuel into the oxidant within the combustion zone and combusting the resulting mixture of fuel and oxidant.
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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) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |