US4292935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low nitrous oxide (NOX) precombustor
Assignee: Boeing North American Inc
•
Filing: 1980-03-31
•
Granted: 1981-10-06
•
Expires: 2000-03-31
Abstract
Abstract A geometrically optimized precombustion chamber 12 for a diesel or stratified charge engine is provided which limits the maximum gas temperature through transonic and/or supersonic flow to prevent the production of nitrous oxides and is defined in accordance with the following equation: ##EQU1##
Inventors
- 👤 William R. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:37
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/14; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A precombustor for use in diesel engines, wherein the improvement comprises defining the internal geometry of the precombustion chamber in accordance with the following equation: ##EQU5## where T is static temperature, A is area of precombustion chamber, γ is ratio of specific heats, and M is mach number of the gas flow.
Claim 2
Dependent Claim
52 words
A precombustor for use in diesel engines, wherein the improvement comprises defining the internal geometry of the precombustion chamber in accordance with the following equation: ##EQU5## where T is static temperature, A is area of precombustion chamber, γ is ratio of specific heats, and M is mach number of the gas flow.
Claim 3
Dependent Claim
10 words
The precombustion chamber of claim 1 wherein dT/T approaches zero.
Claim 4
Dependent Claim
15 words
The precombustion chamber of claim 1 wherein γ lies between about 1.1 and about 1.4.
Claim 5
Dependent Claim
22 words
The precombustion chamber of claim 1 further comprising a converging/diverging nozzle for controlling gas flow into and out of said precombustion chamber.
Claim 6
Dependent Claim
14 words
The precombustion chamber of claim 1 wherein said precombustor is a finned precombustor insert.
References Cited (Backward Citations)
US1413466A
Cited
US1464906A
Cited
US1477984A
Cited
FR552745A
Cited
US1525776A
Cited
US2067274A
Cited
GB764651A
Cited
US4122804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |