CN112146126A - Combined type atomized oil injection structure of air-breathing detonation engine - Google Patents
Combined type atomized oil injection structure of air-breathing detonation engine Download PDFInfo
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- CN112146126A CN112146126A CN202011014599.6A CN202011014599A CN112146126A CN 112146126 A CN112146126 A CN 112146126A CN 202011014599 A CN202011014599 A CN 202011014599A CN 112146126 A CN112146126 A CN 112146126A
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- pipe section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
- F02K7/02—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof the jet being intermittent, i.e. pulse-jet
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a combined atomized oil injection structure of an air-breathing detonation engine, which comprises an engine pipe section, a combined oil injection nozzle and an oil splash ring, wherein the engine pipe section comprises a large-diameter section and a first small-diameter section, the combined oil injection nozzle is arranged in the first small-diameter section and is positioned at the joint of the reduced-diameter section and the first small-diameter section, the combined oil injection nozzle comprises a plurality of direct injection nozzles and atomized oil injection nozzles, the direct injection nozzles are arranged at the section position of the same engine pipe section and take the radial direction of the section of the engine pipe section as an oil injection direction, the atomized oil injection nozzles spray oil in the circumferential direction and are positioned at the downstream of the direct injection nozzles, the oil splash ring is coaxially arranged with the engine pipe section and is positioned between the direct injection nozzles and the engine pipe section, a first air flow gap is reserved between the oil splash ring and the direct injection nozzles, and a second. The invention can give consideration to fuel mass flow and atomization effect under low oil pressure, and ensure stable work of the engine.
Description
Technical Field
The invention relates to an atomized oil injection structure, in particular to a combined atomized oil injection structure of an air-breathing detonation engine.
Background
The application of aspirated pulse detonation engines in practical propulsion systems requires the use of liquid fuels with higher energy density and safe storage properties, which must undergo atomization, vaporization and blending with gaseous oxidants. Although the direct injection type atomizing nozzle can provide fuel oil with sufficient mass flow under the condition of low oil supply pressure, the atomizing effect is poor, the ignition of an ignition section is difficult, and the final detonation effect is not ideal. Although the fine atomizing nozzle has good atomizing effect and can ensure the success rate of ignition and detonation, the mass flow of fuel is small, so that the fuel at the tail part of the air-breathing pulse detonation engine is insufficient to influence the detonation effect of the engine; if the oil supply pressure of the fine atomizing nozzle is increased and the mass flow of the fuel is increased, the problems that the oil supply starting time of the nozzle is advanced and the oil supply stopping time is delayed are caused, and the stable operation of an engine is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a combined type atomized oil injection structure of an air-breathing type detonation engine, which solves the problem that the quality flow and the atomization effect of fuel oil need to be ensured simultaneously under the condition of lower oil supply pressure, and improves the working stability of the air-breathing type pulse detonation engine.
The technical scheme of the invention is as follows: the utility model provides a combination formula atomizing oil spout structure of formula of breathing in detonation engine, includes engine pipe section, combination formula nozzle tip and splash ring, the engine pipe section includes big diameter section and first little diameter section, big diameter section and first little diameter section are connected by the undergauge section, combination formula nozzle tip set up in the first little diameter section and be located the undergauge section with first little diameter section junction, combination formula nozzle tip includes a plurality of nozzle tips and atomizing nozzle tip of penetrating directly, the nozzle tip of penetrating directly sets up in same engine pipe section cross-sectional position and radially be the oil spout direction with engine pipe section cross-section, atomizing nozzle tip is in on the air flow direction of engine pipe section lie in the low reaches of nozzle tip of penetrating directly and use the axial of engine pipe section as the oil spout direction, penetrate directly the nozzle tip with atomizing nozzle tip is by same fuel feeding pipeline fuel feeding, the splash ring and the engine pipe section are coaxially arranged and are positioned between the direct injection nozzle and the engine pipe section, a first airflow gap is reserved between the splash ring and the engine pipe section, and a second airflow gap is reserved between the splash ring and the direct injection nozzle.
The combined atomized oil injection structure has the advantages that part of fuel oil entering from the oil supply pipeline is sprayed out to the splash ring through the direct injection nozzle, when airflow in an engine pipe section flows to the first small-diameter section from the large-diameter section, the airflow circulation area of the reducing section is reduced, so that the air entering the engine is accelerated, the oil film on the inner wall of the splash ring is accelerated and gradually thinned and transversely widened under the action of aerodynamic force and surface tension of the fuel oil, and is atomized into small oil beads under the action of aerodynamic force on two sides of an outlet at the tail end of the splash ring, so that the atomization process is completed. The atomized fuel flows downstream along with the air in the engine, so that the stable work of the air-breathing pulse detonation engine is ensured.
Preferably, the direct oil injection nozzles are arranged at equal intervals in the circumferential direction of the section of the engine pipe.
Preferably, a flange ring is provided on a downstream side of the direct oil jet, the flange ring is disposed coaxially with the splash ring, and an extension gap of the second air flow gap in an axial direction of the engine pipe section is formed between the flange ring and the splash ring. The moving time of the oil film on the surface of the oil splash ring is prolonged by extending the gap, so that the oil film is thinner and is distributed more widely in the circumferential direction, and the atomization effect of the fuel sprayed by the direct injection nozzle is further improved.
Preferably, the end of the extended gap between the flange ring and the oil splash ring does not exceed the outlet of the atomized oil jet at the axial position of the engine pipe section.
Preferably, the engine pipe section comprises a second small-diameter section, the second small-diameter section is connected with the large-diameter section through an expanding section, the second small-diameter section is located at the upstream of the first small-diameter section in the airflow direction of the engine pipe section, and a conical fan housing which is gradually expanded from the second small-diameter section to the first small-diameter section is arranged in the large-diameter section. A channel is formed between the conical fan cover and the pipe wall, and the sectional area of the channel is gradually reduced to accelerate the airflow. The expansion angle of the expanding section is 8-12 degrees, so that smaller air inlet resistance is obtained, the total pressure loss of air inlet is reduced, the inner part of the air passage is a wall flow without a separation zone, the pressure and the speed are axisymmetric and do not change along with the time change, and the stable atomization effect is ensured.
Preferably, the injection caliber of the direct injection oil nozzle is 0.3-1 mm.
The technical scheme provided by the invention has the advantages that: under the condition of lower oil supply pressure, the mass flow of fuel oil is ensured by directly irradiating the oil nozzle, and meanwhile, the ignition success rate is ensured by the good atomization effect of the atomization oil nozzle, so that the air-breathing pulse detonation engine can stably work under the condition of low oil supply pressure.
Drawings
Fig. 1 is a schematic structural diagram of a combined atomized fuel injection structure of an air-breathing detonation engine.
Fig. 2 is a schematic sectional view of the position of the direct oil nozzle and the oil deflector ring.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which would occur to persons skilled in the art upon reading the present specification and which are intended to be within the scope of the present invention as defined in the appended claims.
Referring to fig. 1 and fig. 2, the combined atomized oil injection structure of the induction detonation engine according to the present embodiment includes an engine pipe section, a combined oil nozzle, and an oil deflector ring 1. The engine pipe section includes major diameter section 2, first minor diameter section 3 and second minor diameter section 4, and major diameter section 2 and first minor diameter section 3 are connected by reducing section 5, and second minor diameter section 4 is connected with major diameter section 2 by expanding section 6, and the expansion angle 2 theta of expanding section 6 is 8 ~ 12. Air entering the engine pipe section flows from the second small diameter section 4 to the large diameter section 2 to the first small diameter section 3. Namely, the second small-diameter section 4 is located at the upstream of the first small-diameter section 3 in the airflow direction of the engine pipe section, and a conical fan housing 7 gradually expanding from the second small-diameter section 4 to the first small-diameter section 3 is arranged in the large-diameter section 2 of the engine pipe section. The air flow flows towards the pipe wall of the engine pipe section under the influence of the conical fan cover 7, and when the large-diameter section 2 flows towards the first small-diameter section 3, the flow area is reduced, and the flow speed is increased.
The combination type oil nozzle is arranged in the first small-diameter section 3 and is positioned at the connecting part of the reducing section 5 and the first small-diameter section 3. The combined fuel injector comprises a number of direct fuel injectors and an atomizing fuel injector 8, which are arranged in a cylindrical chamber 9, which cylindrical chamber 9 is arranged coaxially with the engine pipe section. A plurality of oil spray holes 10 with the diameter of 0.3-1 mm are arranged on the circumferential side wall of the cylindrical cavity 9 at intervals at circumferentially equal positions to form a direct injection nozzle. The cylinder cavity 9 is hollow, the rear end of the cylinder cavity 9 is connected with an oil supply pipeline 11, the front end of the cylinder cavity 9 is connected with an atomized oil nozzle 8 through threads, and the atomized oil nozzle 8 is located at the downstream of a direct injection oil nozzle in the airflow direction of an engine pipe section. The direct injection nozzle takes the radial direction of the section of the engine pipe section as the oil injection direction, the atomized injection nozzle 8 takes the axial direction of the engine pipe section as the oil injection direction, and the direct injection nozzle and the atomized injection nozzle 8 are supplied with oil by the same oil supply pipeline 11.
The splash ring 1 and the engine pipe section are coaxially arranged and are positioned between the direct injection nozzle and the engine pipe section, a first airflow gap 12 is reserved between the splash ring 1 and the engine pipe section, and a second airflow gap 13 is reserved between the splash ring 1 and the direct injection nozzle. The circumferential side wall of the cylindrical chamber 9 extends in the downstream direction of the gas flow to form a flange ring 14. The flange ring 14 is provided coaxially with the splash ring 1, and the front end position of the flange ring 14 is flush with the front end position of the splash ring 1. An extension gap 15 of the second air flow gap 13 in the axial direction of the engine pipe section is formed between the flange ring 14 and the splash ring 1, and the end of the extension gap 15 (the front end of the splash ring 1) does not exceed the outlet of the atomized oil nozzle 8 in the axial position of the engine pipe section.
A part of fuel oil provided by the oil supply pipeline 11 flows to the downstream of air flow along the splash ring 1 after being sprayed out from the direct injection nozzle and is atomized at the front end of the splash ring 1, and then the other part of fuel oil is sprayed out and atomized directly by the atomizing nozzle 8, so that the fuel oil quality flow and the atomizing effect are combined, and the working stability of the engine is ensured.
Claims (7)
1. The utility model provides a combination formula atomizing oil spout structure of formula of breathing in detonation engine, a serial communication port, including engine pipe section, combination formula fuel sprayer and splash ring, the engine pipe section is including big diameter section and first little diameter section, big diameter section and first little diameter section are connected by the undergauge section, combination formula fuel sprayer set up in the first little diameter section and be located the undergauge section with first little diameter section junction, combination formula fuel sprayer includes a plurality of fuel sprayers and atomizing fuel sprayer of penetrating directly, the fuel sprayer of penetrating directly sets up in same engine pipe section cross-section position and radially be the oil spout direction with engine pipe section cross-section, the atomizing fuel sprayer is in the air flow direction of engine pipe section is located the low reaches of fuel sprayer of penetrating directly and use the axial of engine pipe section as the oil spout direction, penetrate directly the fuel sprayer with atomizing fuel sprayer is by same fuel feeding line, the splash ring and the engine pipe section are coaxially arranged and are positioned between the direct injection nozzle and the engine pipe section, a first airflow gap is reserved between the splash ring and the engine pipe section, and a second airflow gap is reserved between the splash ring and the direct injection nozzle.
2. The combined atomized fuel injection structure of the air breathing detonation engine as claimed in claim 1, wherein the direct fuel injectors are circumferentially spaced equally about the cross-section of the engine pipe.
3. The combined atomized fuel injection structure of the air-breathing detonation engine as set forth in claim 1, wherein a flange ring is provided on a downstream side of the direct fuel injection nozzle, the flange ring being disposed coaxially with the splash ring, the flange ring and the splash ring constituting therebetween an extension gap of the second air flow gap in an axial direction of the engine pipe section.
4. The combined atomized fuel injection structure of the air breathing detonation engine of claim 3, wherein an end of the extended gap between the flange ring and the splash ring does not exceed an exit of the atomized fuel injector at an axial position of the engine pipe section.
5. The combined atomized fuel injection structure of the air-breathing detonation engine of claim 1, wherein the engine pipe section comprises a second small-diameter section connected to the large-diameter section by a diameter-expanding section, the second small-diameter section is located upstream of the first small-diameter section in the airflow direction of the engine pipe section, and a tapered hood is disposed in the large-diameter section and gradually expands from the second small-diameter section to the first small-diameter section.
6. The combined atomized fuel injection structure of the air breathing detonation engine as claimed in claim 5, characterized in that the divergence angle of the expanding section is 8 ° to 12 °.
7. The combined atomized fuel injection structure of the air-breathing detonation engine as claimed in claim 1, wherein the injection aperture of the direct injection nozzle is 0.3-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014599.6A CN112146126B (en) | 2020-09-24 | 2020-09-24 | Combined type atomized oil injection structure of air-breathing detonation engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011014599.6A CN112146126B (en) | 2020-09-24 | 2020-09-24 | Combined type atomized oil injection structure of air-breathing detonation engine |
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| CN112146126A true CN112146126A (en) | 2020-12-29 |
| CN112146126B CN112146126B (en) | 2021-11-12 |
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| CN112146126B (en) | 2021-11-12 |
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