CN102563705A - Direct-flow fuel nozzle capable of preventing carbon deposit - Google Patents
Direct-flow fuel nozzle capable of preventing carbon deposit Download PDFInfo
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- CN102563705A CN102563705A CN2012100334200A CN201210033420A CN102563705A CN 102563705 A CN102563705 A CN 102563705A CN 2012100334200 A CN2012100334200 A CN 2012100334200A CN 201210033420 A CN201210033420 A CN 201210033420A CN 102563705 A CN102563705 A CN 102563705A
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- nozzle
- carbon deposit
- fuel nozzle
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Abstract
The invention relates to a fuel nozzle applied to the field of combustion, in particular to a direct-flow fuel nozzle capable of effectively preventing carbon deposit. On account of the characteristic that a direct-flow nozzle is easy in carbon deposit and according to the requirement of a combustion device on carbon deposit prevention for the nozzle, the scheme of connecting a traditional fuel nozzle with a sleeve is proposed, and transfer of heat flow in the fuel nozzle is decreased, so that the direct-flow fuel nozzle is free of carbon deposit in long-time operation. The direct-flow fuel nozzle capable of preventing carbon deposit is used on a certain scramjet engine, achieves fine effects, and can be applied to combustion devices such as an aircraft engine, an internal-combustion engine and the like.
Description
Technical field
The present invention relates to a kind of fuel nozzle that is applied to combustion field, relate in particular to a kind of single flow fuel nozzle that can effectively prevent carbon deposit.
Background technology
Fuel nozzle is one of key equipment of burners such as Aero-Space engine, internal combustion engine; It mainly acts on is to change into small drop to fuel spray; The mixing and burning of oxidant in realization and the combustion chamber; Described oxidant is generally liquid oxygen or dinitrogen tetroxide in airspace engine, in other engine, be generally air.
The single flow fuel nozzle relies on pressure to atomize, and has advantages such as simple in structure, reliable operation, in various burners, widely adopts.But, and continue to nozzle and interior mobile fuel Heating thereof, in case heating-up temperature reaches the fuel oil splitting decomposition temperature because the high temperature in the combustion chamber can be delivered to nozzle; Make fuel oil splitting decomposition and in nozzle, form carbon deposit, the carbon deposit in the nozzle can influence the atomization and spraying distribution character of nozzle, reduces the efficiency of combustion in the combustion chamber; Cause fuel flow path to diminish simultaneously; Thereby the reduction fuel flow further quickens the formation of carbon deposit, when serious even can cause stopping working.
Carbon deposit in the nozzle can cause fuel flow path to diminish, thereby fuel flow diminishes, and this has quickened the formation of carbon deposit; Simultaneously, atomization that carbon deposit also has influence on nozzle and spraying distribution character have reduced the efficiency of combustion the combustion chamber in, in the time of seriously even can cause stopping working.
Chinese patent " a kind of anti-carbon deposit liquid fuel nozzle that is used for gas turbine " (application number: 201020179121.4) announced the fuel nozzle that prevents to occur carbon deposit at nozzle face; It carries out cooling protection through the air blowing mode to nozzle; Avoid high-temperature fuel gas to be back to nozzle face, to reach the purpose that prevents carbon deposit.
The shortcoming of such scheme is: on the one hand, the hot-fluid of high-temperature fuel gas is not only to be delivered on the nozzle from end face, and circumferentially also has the hot-fluid transmission to come at nozzle, and it is not enough therefore only protecting nozzle face; On the other hand, owing to adopt the air blowing mode need increase the supply and the control loop of scavenger system, thus increased the complexity of whole system.
Chinese patent " with the method for rare earth oxide coating fire resistant oil nozzle assembly carbon distribution " (application number: 200910060259.4) announced that a kind of rare earth catalyst that adopts quickens the method that fuel oil decomposes.It plates the anti-carbon deposit coating of rare earth oxide through retrofit fuel nozzle inner surface and at inner surface, makes fuel oil form gaseous products, and reduces colloid and carbon deposit formation probability.
It is overheated this essential reason of fuel oil that said method does not solve carbon deposit formation, and in addition, coating loss also can reduce the service life of nozzle.
Summary of the invention
The present invention is directed to the characteristics of carbon trumpet, to the anti-carbon requirement of nozzle, proposed a kind of scheme that adopts traditional fuel nozzle joint sleeve,, make it reach the not purpose of carbon deposit that works long hours through reducing to transmit the hot-fluid of fuel nozzle according to burner.
Technical scheme of the present invention is following:
A kind of single flow is prevented the carbon deposit fuel nozzle, is made up of single flow inner nozzle and sleeve pipe;
The structure of said single flow inner nozzle, operation principle and method for designing are that engine art is known, can be referring to " liquid-propellant rocket engine design (on) " (Zhu Ningchang, Yuhang Publishing House,, PP356～370 in 1994);
Said sleeve pipe is trapezoidal body of revolution structure, and the upper end is columnar structured, and casing inner diameter is the external diameter of single flow inner nozzle, and is preferred, and the cover external diameter of pipe is than the big 2～6mm of internal diameter;
For avoiding forming excessive recirculating zone, prevent fuel gas return-flow to end face, and be delivered in the nozzle at end face; The sleeve pipe lower end is a taper body of revolution structure; Awl point and inner nozzle end face, the angle of awl bus and axis generally are chosen for 30～60 degree, are preferably 40～50 degree; The sleeve pipe total length is the same with inner nozzle length.
The thickness of sleeve pipe confirms that by requirement of strength its method for designing is the structural design known.
The material of said single flow inner nozzle and sleeve pipe is stainless steel or carbon steel, can connect with welding manner, also can adopt engage thread to connect.
According to different instructions for uses, can seal between sleeve pipe and the inner nozzle and be vacuum, atmospheric air or nitrogen, wherein, the effect of heat insulation of sealing vacuum is best.
The inner nozzle housing directly contacted with the hot wall face originally; After adopting the present invention, the inner nozzle housing contacts with wall through vacuum sleeve, is completely cut off by sleeve pipe or is reduced to very low level from the hot-fluid of wall; Its heat is difficult to be delivered on the fuel oil that inner nozzle and Qi Nei flow; Fuel oil temperature will remain than low value, can not reach the fuel oil splitting decomposition temperature, thereby can effectively prevent carbon deposit.
Adopt the present invention can obtain following technique effect:
Single flow fuel nozzle of the present invention can effectively prevent the fuel oil carbon deposit, on certain scramjet engine, adopts and obtains good result, also may be used on burners such as aero-engine, internal combustion engine.
Description of drawings
Fig. 1: existing single flow fuel nozzle structural representation;
Fig. 2: single flow of the present invention is prevented the carbon deposit fuel nozzle;
Fig. 3: do not adopt to occur carbon deposit when of the present invention;
Fig. 4: after adopting the present invention, carbon deposit does not take place.
Reference numeral
1. fuel oil
2. single flow inner nozzle
3. the carbon deposit that generates
4. hot-fluid
5. vacuum sleeve
6. the gas of vacuum or sealing
The specific embodiment
Fig. 1 is existing single flow fuel nozzle structural representation.Fuel oil 1 flows into from the single flow upper end of nozzle, enters into inner nozzle 2, is injected in the combustion chamber through a constricted channel.The hot-fluid 4 that imports inner nozzle 2 into comprises the fuel gas calorie that imports into from end face and imports the heat of inner nozzle 2 from side wall surface into shown in arrow among the figure.These heats will cause carbon deposit 3 occurring in the nozzle constriction point, in case carbon deposit 3 occurs, the flow of fuel oil 1 will diminish, and quicken the formation of carbon deposit, and stop up whole passage.
Fig. 2 is the anti-carbon deposit fuel nozzle of single flow of the present invention.It is on single flow fuel oil inner nozzle 2 bases shown in Figure 1, coats vacuum sleeve 5, to reduce to import into from sidewall the heat of fuel oil 1.
Vacuum sleeve 5 is trapezoidal body of revolution structure; The internal diameter of body of revolution is the external diameter of single flow inner nozzle, and the body of revolution external diameter is than the big 3mm of internal diameter, and the length of body of revolution is the same with inner nozzle length; For avoiding forming excessive recirculating zone at end face, the body of revolution end face is taper, and awl point and inner nozzle end face, the angle of awl bus and axis are 45 degree; The thickness of vacuum sleeve calculates according to intensity and confirms as 2mm; Because the heat flow density of present embodiment is not very high, thus vacuum sleeve 5 directly weld with inner nozzle 2, its inner sealing atmospheric air 6.
Fig. 3 is the single flow nozzle that does not adopt when of the present invention, after working long hours, cuts the back open along axis and observes, and serious carbon deposit is arranged in it;
Fig. 4 is the single flow nozzle behind employing the present invention, after the identical time with Fig. 3 work, does not have carbon deposit in it basically.
Claims (5)
1. the anti-carbon deposit fuel nozzle of single flow is made up of single flow inner nozzle and sleeve pipe, and said sleeve pipe is trapezoidal body of revolution structure, and the upper end is columnar structured, and internal diameter is the external diameter of centrifugal inner nozzle, and external diameter is than the big 2～6mm of internal diameter; The sleeve pipe lower end is a taper body of revolution structure, and awl point and inner nozzle end face, the angle of awl bus and axis are 30～60 degree, and the sleeve pipe total length is the same with inner nozzle length.
2. the anti-carbon deposit fuel nozzle of the described single flow of claim 1 is characterized in that: overlap external diameter of pipe than the big 2～6mm of casing inner diameter.
3. claim 1 or 2 described single flow are prevented the carbon deposit fuel nozzle, it is characterized in that: the angle of awl bus and axis is chosen for 40～50 degree.
4. the described single flow of claim 3 is prevented the carbon deposit fuel nozzle, it is characterized in that: the angle of awl bus and axis is chosen for 45 degree.
5. the anti-carbon deposit fuel nozzle of claim 1 or 2 described single flow is characterized in that: can seal a kind of in vacuum, atmospheric air or the nitrogen between sleeve pipe and the inner nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100334200A CN102563705A (en) | 2012-02-15 | 2012-02-15 | Direct-flow fuel nozzle capable of preventing carbon deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100334200A CN102563705A (en) | 2012-02-15 | 2012-02-15 | Direct-flow fuel nozzle capable of preventing carbon deposit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102563705A true CN102563705A (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100334200A Pending CN102563705A (en) | 2012-02-15 | 2012-02-15 | Direct-flow fuel nozzle capable of preventing carbon deposit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520711A (en) * | 2020-03-17 | 2020-08-11 | 西北工业大学 | Structure for improving carbon deposition of centrifugal nozzle |
| CN112050253A (en) * | 2020-09-18 | 2020-12-08 | 中国航发四川燃气涡轮研究院 | Multiple thermal-insulated fuel nozzle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4817873A (en) * | 1985-11-13 | 1989-04-04 | Orbital Engine Company Proprietary Limited | Nozzles for in-cylinder fuel injection systems |
| JP2000205523A (en) * | 1999-01-14 | 2000-07-25 | Chugai Ro Co Ltd | Burner for manufacturing inorganic spheroidized particles and its burner device |
| JP2002130613A (en) * | 2000-10-20 | 2002-05-09 | Taiheiyo Cement Corp | Combustion nozzle and method for combustion of combustible synthetic resin in which the nozzle is used |
| CN201697162U (en) * | 2010-05-05 | 2011-01-05 | 中国航空工业集团公司沈阳发动机设计研究所 | Carbon deposit prevention liquid fuel nozzle for gas turbine |
-
2012
- 2012-02-15 CN CN2012100334200A patent/CN102563705A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4817873A (en) * | 1985-11-13 | 1989-04-04 | Orbital Engine Company Proprietary Limited | Nozzles for in-cylinder fuel injection systems |
| JP2000205523A (en) * | 1999-01-14 | 2000-07-25 | Chugai Ro Co Ltd | Burner for manufacturing inorganic spheroidized particles and its burner device |
| JP2002130613A (en) * | 2000-10-20 | 2002-05-09 | Taiheiyo Cement Corp | Combustion nozzle and method for combustion of combustible synthetic resin in which the nozzle is used |
| CN201697162U (en) * | 2010-05-05 | 2011-01-05 | 中国航空工业集团公司沈阳发动机设计研究所 | Carbon deposit prevention liquid fuel nozzle for gas turbine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520711A (en) * | 2020-03-17 | 2020-08-11 | 西北工业大学 | Structure for improving carbon deposition of centrifugal nozzle |
| CN112050253A (en) * | 2020-09-18 | 2020-12-08 | 中国航发四川燃气涡轮研究院 | Multiple thermal-insulated fuel nozzle |
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Application publication date: 20120711 |