CN111578313A - Fuel oil pre-distribution device for pneumatic auxiliary atomization - Google Patents
Fuel oil pre-distribution device for pneumatic auxiliary atomization Download PDFInfo
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- CN111578313A CN111578313A CN202010449949.5A CN202010449949A CN111578313A CN 111578313 A CN111578313 A CN 111578313A CN 202010449949 A CN202010449949 A CN 202010449949A CN 111578313 A CN111578313 A CN 111578313A
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- oil
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- ring body
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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
- F23R3/30—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention discloses a fuel oil pre-distribution device for pneumatic auxiliary atomization, which comprises: the sleeve ring body is arranged on the sleeve ring body and is used for fuel circulation, fuel is sprayed out of the sleeve ring body and enters the oil throwing disc, the rear end of the sleeve ring body is used for spraying outside sucked gas to the oil throwing disc and generating driving force for the fuel to accelerate the gas entraining mechanism of the throwing speed of the fuel from the oil throwing disc, and the gas entraining mechanism gradually reduces along with the rising gas spraying amount of the internal temperature of the sleeve ring body until no gas is sprayed out. According to the fuel oil pre-distribution device with the pneumatic auxiliary atomization function, gas is pressurized by the air pump, enters the air entraining mechanism through the gas passage, and is sprayed out along the circumferential direction of the sleeve ring body to form a circle of annular gas film, so that a pushing effect is generated on fuel oil, the throwing-out speed of the fuel oil from the oil cavity of the oil throwing disc is accelerated, the fuel oil still has a high throwing-out speed even in the starting stage of an engine, and the atomization effect of the fuel oil in the combustion chamber is improved.
Description
Technical Field
The invention relates to the field of gas turbine engines, in particular to a fuel oil pre-distribution device for pneumatic auxiliary atomization.
Background
Gas turbine engines are devices that convert the chemical energy of a fuel into mechanical work. In the field of gas turbine engines, the engine generally consists of a combustion chamber where fuel oil is mixed with air and combusted, and the combustion products are discharged from the combustion chamber outlet and pass through a gas turbine guide to impact turbine blades, thereby propelling the turbine to rotate and generating power output. The fuel enters the fuel distribution device through the fuel supply line and is then injected into the combustion chamber through the fuel atomization device to complete combustion in an oil mist state. The fuel distribution device is responsible for pre-distributing the distribution of the fuel so as to be beneficial to organizing the combustion of the fuel in the combustion chamber, and further obtain higher combustion efficiency and better combustion outlet temperature. The combustion chamber can be divided into forms of direct flow, backflow, baffling and the like according to the flowing characteristics of internal airflow, and the fuel oil distribution device and the fuel oil atomization device of the combustion chamber with different forms are also respectively characterized.
The existing baffled combustion chamber generally adopts an oil supply mode that an injection oil duct is matched with an oil thrower to finish fuel oil pre-distribution and fuel oil atomization. A fuel oil passage is formed in the injection oil duct, and fuel oil radially outwards enters an oil cavity of the oil thrower from the oil outlet to finish the pre-distribution of the fuel oil; the centrifugal oil thrower is connected with a main shaft of an engine and rotates at a high speed along with the main shaft, and fuel oil in an oil cavity of the centrifugal oil thrower is ejected outwards from an ejection hole of the oil thrower at a high speed along the radial direction under the action of centrifugal force to enter a combustion chamber to finish the atomization of the fuel oil. In the starting stage of the engine, the initial rotating speed of the turbine is zero, and the oil thrower cannot be driven to rotate, so that the starting motor is required to drive the oil thrower to rotate in the starting stage, the rotating speed of the motor is much lower than the working rotating speed of the engine in general, and the fuel oil atomization effect of the oil thrower is poor, so that the combustion efficiency of a combustion chamber in the starting stage is low, and the exhaust pollution is high. In addition, when the rotating speed is low, the oil thrower disc cannot throw the fuel oil out of the oil cavity in time, and the fuel oil which is not thrown out in time can be gathered and leaked under the action of gravity, so that the waste of the fuel is caused, and the safety of the engine is reduced.
Disclosure of Invention
The invention provides a fuel oil pre-distribution device for pneumatic auxiliary atomization, which aims to solve the technical problems of poor fuel oil atomization effect, low combustion efficiency, large exhaust pollution and oil leakage phenomenon in the starting stage of the conventional device in the conventional gas turbine engine.
The technical scheme adopted by the invention is as follows:
a pneumatically-assisted atomized fuel predistribution device arranged at the top of a flame tube for predistribution of fuel entering a combustion chamber of an engine, comprising: the sleeve ring body, lay the fuel injection mechanism who is used for supplying the fuel circulation and spouts the fuel from this internal blowout of sleeve ring to the disc in on the sleeve ring body, be located the bleed mechanism that is used for spouting the inspiratory gas in external world to the disc and produce the driving force with accelerating the fuel from disc throw-out speed to the fuel that is used for of the second end of sleeve ring body, bleed mechanism reduces along with the rising of the internal temperature of sleeve ring and gaseous blowout volume gradually, until no gas blowout.
Further, the bleed mechanism includes: the gas inlet is used for guiding outside gas to enter the sleeve ring body, the vent groove is arranged at the second end of the sleeve ring body and distributed along the circumferential direction of the sleeve ring body and used for temporarily storing the gas, the vent pipeline is arranged at the output end of the gas inlet and used for communicating the gas to the vent groove, and an annular adjusting piece used for adjusting the gas discharge amount is arranged at a gas outlet of the vent groove; the air inlet hole, the vent pipeline and the vent groove form an air passage inside the sleeve ring body.
Further, the annular adjusting piece adopts an annular block; the inner ring wall of the annular block is in interference fit with the inner groove wall of the vent groove, and the outer ring wall of the annular block is in clearance fit with the outer groove wall of the vent groove.
Further, the annular adjusting piece is provided with a positioning piece for preventing the annular adjusting piece from moving.
Furthermore, the annular adjusting piece is made of a material with a higher linear expansion coefficient; the linear expansion coefficient of the annular adjusting piece is x-x.
Furthermore, the air inlets and the ventilation pipelines are correspondingly arranged into a group structure one by one, and the group structure is provided with a plurality of groups; the plurality of groups of air pipelines are arranged on the air channel at intervals along the circumferential direction and are positioned in the same circumferential direction.
Further, the oil injection mechanism includes: the fuel injection mechanism comprises a sleeve ring body, an oil inlet hole, an oil inlet pipeline, an oil outlet hole and a sealing cover, wherein the oil inlet hole is used for being connected with an external oil path to introduce fuel oil into the oil injection mechanism; the oil inlet hole, the oil inlet pipeline, the oil through groove, the oil outlet pipeline and the oil outlet hole form a fuel oil passage inside the sleeve ring body.
Furthermore, the oil outlet pipelines and the oil outlet holes are correspondingly distributed into a group structure one by one, and the group structure is provided with a plurality of groups; the oil outlet pipelines are circumferentially arranged on the oil through groove at intervals and are positioned in the same circumferential direction.
Furthermore, the oil outlet pipeline is circumferentially arranged along the periphery of the vent groove and is annularly arranged with the vent groove in a concentric manner.
Furthermore, the outer wall surface of the sleeve ring body is provided with a mounting edge extending outwards in the radial direction, and the sleeve ring body is fixedly mounted with the diffuser through the mounting edge.
The invention has the following beneficial effects:
the fuel oil pre-distribution device for pneumatically assisting atomization is a static part, the oil thrower is a rotor part which can rotate along with a main shaft of an engine, and the rotor part and the oil thrower are installed in a matching way in a working state. In the starting stage of the engine, fuel oil is pressurized by the oil pump, then is input into the oil supply pipeline from the oil tank, enters the oil injection mechanism for circulation, is sprayed out from the oil injection mechanism, enters the oil thrower, and enters the combustion chamber along an oil thrower hole on the oil thrower under the action of centrifugal force generated by rotation of the oil thrower, so that the fuel oil is fully combusted in the combustion chamber. The gas is pressurized by the air pump and enters the air entraining mechanism through the gas passage, and is sprayed out along the circumferential direction of the sleeve ring body to form a circle of annular gas film, so that the fuel is pushed, the throwing speed of the fuel from the oil cavity of the oil thrower is improved, the fuel still has higher throwing speed even in the starting stage of the engine, the atomization effect of the fuel in the combustion chamber is improved, and the oil leakage phenomenon at the matching part of the rotor part and the stator part is further improved. And after the engine works stably, the ambient temperature rises, the rotating speed of the oil thrower disc rises, the fuel oil atomization effect reaches an ideal state, the gas injection quantity of the gas guide mechanism gradually decreases along with the rise of the temperature until no gas is injected, namely, an automatic closing state is realized, so that the fuel oil pre-distribution device and the oil thrower disc which assist in atomization in a pneumatic mode enter a normal working state.
The fuel oil pre-distribution device for pneumatic auxiliary atomization is particularly suitable for a baffling combustion chamber, is easy to process, stable and reliable in fuel oil supply, and capable of efficiently improving the fuel oil atomization effect in the starting stage of an engine, and is beneficial to improving the ignition starting performance of the engine and improving the oil leakage problem of a centrifugal oil throwing atomization device in the starting stage, so that the combustion efficiency is improved, pollution such as smoke and the like is reduced, the safety and the service life of the engine are further improved, and the use and maintenance cost of the engine is reduced.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a pneumatically assisted atomized fuel pre-dispensing device of the preferred embodiment of the present invention;
FIG. 2 is a semi-transparent structural schematic view of a preferred embodiment of the present invention of a thimble body;
FIG. 3 is a right side view of the semi-transparent construction of the sleeve ring body of the preferred embodiment of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the installation of a pneumatically assisted atomized fuel predistribution device according to the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of the fuel path of the fuel injection mechanism of the preferred embodiment of the present invention;
FIG. 7 is a schematic view of the air passageway of the bleed mechanism of the preferred embodiment of the present invention; and
fig. 8 is a relative structure schematic diagram of the oil injection mechanism and the air entraining mechanism of the preferred embodiment of the invention.
The reference numbers illustrate:
1. a collar body; 2. a flame tube; 3. a diffuser; 4. an oil slinger;
11. an oil injection mechanism; 111. an oil inlet hole; 112. an oil inlet pipeline; 113. an oil groove is communicated; 114. an oil outlet pipeline; 115. an oil outlet hole; 116. a sealing cover;
12. a gas-introducing mechanism; 121. an air inlet; 122. a vent line; 123. a vent channel; 124. an annular adjustment member;
13. and (7) installing edges.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic view of a pneumatically assisted atomized fuel pre-dispensing device of the preferred embodiment of the present invention; FIG. 2 is a semi-transparent structural schematic view of a preferred embodiment of the present invention of a thimble body; FIG. 3 is a right side view of the semi-transparent construction of the sleeve ring body of the preferred embodiment of the present invention; FIG. 4 is a schematic view of the invention A-A; FIG. 5 is a schematic view of the installation of a pneumatically assisted atomized fuel predistribution device according to the preferred embodiment of the present invention; FIG. 6 is a schematic diagram of the fuel path of the fuel injection mechanism of the preferred embodiment of the present invention; FIG. 7 is a schematic view of the air passageway of the bleed mechanism of the preferred embodiment of the present invention; fig. 8 is a relative structure schematic diagram of the oil injection mechanism and the air entraining mechanism of the preferred embodiment of the invention.
As shown in fig. 1, 4 and 5, the fuel predistribution device for pneumatically assisting atomization of the present embodiment is arranged at the top end of a flame tube 2 to predistribute fuel entering a combustion chamber of an engine, and comprises: the sleeve ring body 1, lay and be used for on the sleeve ring body 1 supplying the fuel circulation and spout the fuel oil to the fuel injection mechanism 11 in the oil thrower dish 4 from the internal blowout of sleeve ring body 1, be in the bleed mechanism 12 that is used for spouting the inspiratory gas in external world to oil thrower dish 4 and produce the driving force with accelerating the fuel oil from oil thrower dish 4 throw speed to fuel oil of sleeve ring body's 1 second end, bleed mechanism 12 reduces along with the ascending and gaseous blowout volume of the inside temperature of sleeve ring body 1 gradually, until there is no gas blowout.
The fuel oil pre-distribution device for pneumatically assisting atomization is a static part, the oil thrower 4 is a rotor part which can rotate along with the main shaft of an engine, and the rotor part and the engine main shaft are installed in a matching way in a working state. In the starting stage of the engine, fuel oil is pressurized by the oil pump, then is input into the oil supply pipeline from the oil tank, enters the oil injection mechanism 11 for circulation, is sprayed out of the oil injection mechanism 11, enters the oil thrower 4, and enters the combustion chamber along oil thrower holes in the oil thrower 4 under the action of centrifugal force generated by rotation of the oil thrower 4, so that the fuel oil is fully combusted in the combustion chamber. The gas is pressurized by the air pump and enters the air entraining mechanism 12 through the gas passage, and is sprayed out along the circumferential direction of the sleeve ring body 1 to form a circle of annular gas film, so that the fuel is pushed, the throwing speed of the fuel from the oil cavity of the oil thrower 4 is improved, the fuel still has higher throwing speed even in the starting stage of the engine, the atomization effect of the fuel in the combustion chamber is improved, and the oil leakage phenomenon at the matching part of the rotor part and the stator part is further improved. And after the engine works stably, the ambient temperature rises, the rotating speed of the oil thrower 4 rises, the fuel oil atomization effect reaches an ideal state, the gas injection quantity of the gas introducing mechanism 12 is gradually reduced along with the rise of the temperature until no gas is injected, namely, an automatic closing state is realized, so that the fuel oil pre-distribution device for pneumatically assisting atomization and the oil thrower 4 enter a normal working state.
The fuel oil pre-distribution device for pneumatic auxiliary atomization is particularly suitable for a baffling combustion chamber, is easy to process, stable and reliable in fuel oil supply, and capable of efficiently improving the fuel oil atomization effect in the starting stage of an engine, and is beneficial to improving the ignition starting performance of the engine and improving the oil leakage problem of a centrifugal oil throwing atomization device in the starting stage, so that the combustion efficiency is improved, pollution such as smoke and the like is reduced, the safety and the service life of the engine are further improved, and the use and maintenance cost of the engine is reduced. The first end and the second end of the sleeve ring body 1 are divided by the flowing direction of fuel oil, the first end is the flowing direction of the fuel oil, and the second end is the flowing direction of the fuel oil.
The baffling combustion chamber is characterized in that an oil supply mode of centrifugal oil throwing is adopted. The chamber between the inner ring of the liner 2 and the outer ring of the liner 2 is the area where the oil and gas mix and burn. The surfaces of the inner ring and the outer ring of the flame tube are provided with a plurality of small holes, big holes or slots, and air enters the interior of the flame tube through the small holes, the big holes and the slots. The oil thrower 4 is mounted on the main shaft of the engine and rotates together with the main shaft. Fuel enters the oil thrower 4 (rotor part) through the oil supply device (static part), is attached in an oil cavity of the oil thrower 4 and rotates at a high speed along with the oil thrower 4, and is thrown into a combustion chamber through an oil through hole in the oil thrower 4 under the action of centrifugal force to be combusted. Because the oil slinger 4 must be connected with the main shaft, and the fuel oil flows in the radial direction to be thrown into the combustion chamber, when the combustion chamber is organized into an air flow path, the air flow must be greatly bent and then enters the combustion chamber, and therefore, in the starting stage of the engine, the initial rotating speed of the turbine is zero, and the oil slinger cannot be driven to rotate.
As shown in fig. 2 and 4, in the present embodiment, the bleed mechanism 12 includes: the gas discharge device comprises a gas inlet hole 121 for leading outside gas into the sleeve ring body 1, a vent groove 123 arranged at the second end of the sleeve ring body 1 along the circumferential direction of the sleeve ring body 1 and used for temporarily storing the gas, a vent pipeline 122 arranged at the output end of the gas inlet hole 121 and used for communicating the gas into the vent groove 123, and an annular adjusting piece 124 used for adjusting the gas discharge amount is arranged at the gas outlet of the vent groove 123. The gas inlet holes 121, the vent pipe 122 and the vent groove 123 constitute a gas passage inside the thimble body 1. The bleed mechanism 12 comprises an air inlet aperture 121, a vent line 122, a vent slot 123 and an annular adjuster 124. The direction of the gas outlet of the air-entraining mechanism 12 is opposite to the oil cavity of the oil thrower 4, so that the fuel can generate high-efficiency driving force, and the fuel can reach the maximum speed when reaching the oil cavity of the oil thrower 4. The gas is pressurized by the air pump and enters the gas inlet holes 121 through the gas passage to flow through the gas groove 123, and the gas in the gas groove 123 has a certain pressure, so that the annular gap between the gas groove 123 and the annular adjusting member 124 is formed through the adjustment of the annular adjusting member 124, the gas with a certain pressure is sprayed out through the annular gap to form a circle of annular gas film, and the fuel oil is pushed.
As shown in fig. 1 and 4, in the present embodiment, the ring-shaped adjusting member 124 is a ring-shaped block. The inner annular wall of the annular block is in interference fit with the inner groove wall of the vent groove 123, and the outer annular wall of the annular block is in clearance fit with the outer groove wall of the vent groove 123. The annular adjusting member 124 is an annular block, the inner annular wall of the annular block is in interference fit with the inner groove wall of the vent groove 123, the outer annular wall of the annular block is in clearance fit with the outer groove wall of the vent groove 123, and the inner annular wall of the annular block is in interference fit with the inner groove wall of the vent groove 123 to increase the friction force therebetween, so that the annular block is prevented from falling off from the vent groove 123. The gas in the vent groove 123 is discharged from a gas discharge passage formed at a position where the outer circumferential wall of the annular block is in clearance fit with the outer groove wall of the vent groove 123, and the gas having a certain pressure is ejected from the gas discharge passage.
Preferably, the ring adjuster 124 is provided with a positioning member for preventing the ring adjuster 124 from being moved. In order to increase the stability of the annular block matching with the vent groove 123, a positioning piece for preventing the annular block from slipping is arranged, so that the annular block is prevented from being ejected out by gas when the pressure of the gas in the vent groove 123 is high. The opening of the vent groove 123 is not completely blocked by the annular blocking piece, so that the annular blocking piece has a certain expansion space, the annular blocking piece gradually realizes comprehensive interference fit between the outer wall surface of the annular blocking piece and the inner groove wall of the vent groove 123 along with the high-temperature volume, the outer wall surface of the annular blocking piece and the groove wall surface of the vent groove 123 are closed to block gas, and the gas at the moment cannot be discharged.
In this embodiment, the annular adjuster 124 is made of a material having a high linear expansion coefficient. After the engine is operated stably, the ambient temperature rises, the annular adjusting member 124 expands gradually with the rise of the temperature, and the annular gap between the annular adjusting member 124 and the vent groove 123 is reduced gradually until the annular gap is closed. The annular adjusting member 124 has a high linear expansion coefficientThe ring-shaped adjusting member 124 is made of magnesium-aluminum alloy material, and has a linear expansion coefficient higher than that of the sleeve ring body 1, such as MB8, which can reach 24.9 × 10-6The sleeve ring body 1 adopts titanium alloy TC1 with the linear expansion coefficient of 8.8 × 10 at/° C-6V. C. The principle of selecting the materials here is to use the materials with different linear expansion coefficients, use the material with the larger linear expansion coefficient to make the annular adjusting member 124, and use the material with the smaller linear expansion coefficient to make the sleeve ring body 1, so as to increase the temperature, the adjusting member 124 expands more outwards, the sleeve ring body 1 expands less outwards, and the gap between the two disappears. Besides the two materials, other materials can be adopted, specifically which material is used, how much the linear expansion coefficient difference between the materials is, and the calculation is specifically carried out according to the design size of the part and the size of the design gap.
As shown in fig. 7, in the present embodiment, the air inlets 121 and the ventilation pipes 122 are arranged in a group structure in a one-to-one correspondence manner, and the group structure is provided with a plurality of groups. The plurality of sets of ventilation pipelines 122 are circumferentially arranged on the ventilation groove 123 at intervals and are in the same circumferential direction. The air inlet holes 121 are connected with the air passage, and by designing a plurality of groups of air inlet holes 121 and the vent pipes 122, the air in the vent groove 123 is sufficient, and the plurality of groups of vent pipes 122 are arranged on the vent groove 123 at intervals along the circumferential direction and are positioned on the same circumferential direction. Above-mentioned inlet port 121 and vent line 122 adopt the multiunit, and vent line 122 lays on air channel 123 along circumference interval to form round annular air film, multiunit inlet port 121 and vent line 122 one-to-one design, make the inside gas distribution of air channel 123 even, thereby the axial jet power of the round annular air film that forms is even, in order to produce even motive force to fuel, bear the weight of the oil intracavity that fuel spouts to disc 4.
As shown in fig. 2 and 4, in the present embodiment, the oil injection mechanism 11 includes: an oil inlet hole 111 used for being connected with an external oil path to introduce fuel into the oil injection mechanism 11, an oil through groove 113 arranged at the first end of the sleeve ring body 1 along the circumferential direction of the sleeve ring body 1 and used for fuel circulation, an oil inlet pipeline 112 arranged at the output end of the oil inlet hole 111 and used for enabling the fuel to circulate into the oil through groove 113, an oil outlet pipeline 114 arranged on the oil through groove 113 and used for axially spraying the rear end of the fuel towards the direction of the air through groove 123, an oil outlet hole 115 arranged at the output end of the oil outlet pipeline 114 and used for spraying the fuel into the oil thrower 4, and a sealing cover 116 used for sealing the oil through groove 113 and matched with the oil through groove 113 in a sealing mode to form an annular cavity for containing the fuel. The oil inlet hole 111, the oil inlet pipeline 112, the oil through groove 113, the oil outlet pipeline 114 and the oil outlet hole 115 form a fuel passage inside the sleeve ring body 1. The oil through groove 113 is arranged in the sleeve ring body 1, and forms an annular cavity for fuel oil circulation with the sealing cover 116, when the oil pump is opened in a working state, the oil pump pressurizes to pump fuel oil into the oil supply pipeline, the fuel oil enters from the oil inlet hole 111 and flows through the oil inlet pipeline 112 to enter the oil through groove 113, and the fuel oil is sprayed out from the oil outlet pipeline 114 and the oil outlet hole 115 to the inner cavity of the oil thrower 4 along with the gradual filling of the fuel oil in the vent groove 123. The section radius of the oil inlet pipeline 112 is far larger than that of the oil outlet pipeline 114, so that the oil through groove 113 is filled with fuel oil, and the fuel oil is uniformly sprayed out from the oil outlet hole 115. In addition, the oil outlet pipeline 114 is arranged close to the vent groove 123, so that the fuel can directly act with an annular air film formed by the vent groove 123 when the fuel is sprayed out from the oil outlet hole 115 through the oil outlet pipeline 114.
As shown in fig. 3, 6 and 8, in the present embodiment, the oil outlet pipelines 114 and the oil outlet holes 115 are arranged in a one-to-one correspondence manner in a grouped structure, and the grouped structure is provided with a plurality of groups. The oil outlet pipelines 114 are circumferentially arranged on the oil through groove 113 at intervals and are in the same circumferential direction. The oil outlet pipelines 114 and the oil outlet holes 115 are correspondingly arranged in a group structure one by one, a plurality of groups are adopted, the total radial dimension of the plurality of groups of oil outlet pipelines 114 is smaller than the radial dimension of the oil inlet pipeline 112 so as to satisfy the condition that the whole oil through groove 113 is filled with fuel oil and the fuel oil is sprayed out from the plurality of groups of oil outlet pipelines 114 and the oil outlet holes 115 to form uniformly dispersed fuel oil droplets, the plurality of groups of oil outlet pipelines 114 are arranged on the oil through groove 113 at intervals along the circumferential direction and are positioned in the same circumferential direction, the same annular shape similar to an annular gas film is also formed, and the sprayed fuel oil droplets are sprayed into an oil cavity of the oil thrower 4 under the action of the. In general, the larger the number of the outlet lines 114 and the outlet holes 115, the smaller the droplet diameter of the fuel to be ejected. Preferably, the outlet line 114 is circumferentially arranged along the periphery of the vent groove 123 and is arranged in a concentric circle with the vent groove 123. The plurality of oil outlet lines 114 are arranged offset from the plurality of vent lines 122. The plurality of sets of oil outlet pipelines 114 are arranged at intervals along the circumferential direction and are designed outside a circle of annular gas film formed by the vent grooves 123, so that gas is fully contacted with fuel oil, the gas carries the fuel oil and enters the inner cavity of the oil slinger 4 together, and the speed of the fuel oil thrown out of the oil slinger 4 is increased.
As shown in fig. 5, in the present embodiment, the outer wall surface of the sleeve ring body 1 is provided with a mounting edge 13 extending radially outward, and the sleeve ring body 1 is fixed to the diffuser 3 through the mounting edge 13. To form a stable stator member.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fuel oil pre-distribution device for pneumatic auxiliary atomization is arranged at the top end of a flame tube (2) to pre-distribute fuel oil entering a combustion chamber of an engine,
the method comprises the following steps: a sleeve ring body (1),
an oil injection mechanism (11) which is arranged on the sleeve ring body (1) and is used for circulating fuel oil and spraying the fuel oil from the sleeve ring body (1) to the oil thrower,
a gas-guiding mechanism (12) which is arranged at the second end of the sleeve ring body (1) and is used for spraying gas sucked from the outside to the oil thrower and generating a driving force for fuel so as to accelerate the throwing speed of the fuel from the oil thrower (4),
the air-entraining mechanism (12) gradually reduces the air ejection quantity along with the rise of the internal temperature of the sleeve ring body (1) until no air is ejected.
2. A pneumatically assisted atomized fuel pre-dispensing device according to claim 1,
the bleed mechanism (12) comprises: an air inlet hole (121) for leading outside air into the sleeve ring body (1), a vent groove (123) which is arranged at the second end of the sleeve ring body (1) along the circumferential direction of the sleeve ring body (1) and is used for temporarily storing the air, a vent pipeline (122) which is arranged at the output end of the air inlet hole (121) and is used for communicating the air into the vent groove (123),
an annular adjusting piece (124) for adjusting the gas discharge amount is arranged at the gas outlet of the vent groove (123);
the air inlet holes (121), the vent pipelines (122) and the vent grooves (123) form an air passage inside the sleeve ring body (1).
3. A pneumatically assisted atomized fuel pre-dispensing device according to claim 2,
the annular adjusting piece (124) adopts an annular block;
the inner ring wall of the annular block is in interference fit with the inner groove wall of the vent groove (123),
the outer ring wall of the annular plugging block is in clearance fit with the outer groove wall of the vent groove (123).
4. A pneumatically assisted atomized fuel pre-dispensing device according to claim 3,
the annular adjusting piece (124) is provided with a positioning piece for preventing the annular adjusting piece (124) from moving.
5. A pneumatically assisted atomized fuel pre-dispensing device according to claim 2,
the annular adjusting piece (124) is made of a material with a high linear expansion coefficient.
6. A pneumatically assisted atomized fuel pre-dispensing device according to claim 2,
the air inlets (121) and the ventilation pipelines (122) are correspondingly arranged into a group structure one by one, and the group structure is provided with a plurality of groups;
the plurality of groups of the vent pipelines (122) are arranged on the vent groove (123) at intervals along the circumferential direction and are positioned in the same circumferential direction.
7. A pneumatically assisted atomized fuel pre-dispensing device according to claim 2,
the oil injection mechanism (11) includes: an oil inlet hole (111) used for being connected with an external oil path to introduce fuel oil into the oil injection mechanism (11), an oil through groove (113) which is arranged at the first end of the sleeve ring body (1) and is used for fuel oil circulation along the circumferential direction of the sleeve ring body (1), an oil inlet pipeline (112) which is arranged at the output end of the oil inlet hole (111) and is used for enabling the fuel oil to circulate to the oil through groove (113), and an oil outlet pipeline (114) which is arranged on the oil through groove (113) and is used for conveying the fuel oil to the direction of the air through groove (123) and is axially sprayed at the rear end,
an oil outlet hole (115) at the output end of the oil outlet pipeline (114) for spraying fuel oil into the oil thrower (4),
the oil through groove (113) is provided with a sealing cover (116) which is used for sealing the oil through groove (113) and is in sealing fit with the oil through groove (113) to form an annular cavity for containing fuel oil;
the oil inlet hole (111), the oil inlet pipeline (112), the oil through groove (113), the oil outlet pipeline (114) and the oil outlet hole (115) form a fuel oil passage inside the sleeve ring body (1).
8. A pneumatically assisted atomized fuel pre-dispensing device according to claim 7,
the oil outlet pipelines (114) and the oil outlet holes (115) are correspondingly distributed into a grouped structure one by one, and the grouped structure is provided with a plurality of groups;
the oil outlet pipelines (114) are circumferentially arranged on the oil through groove (113) at intervals and are in the same circumferential direction.
9. A pneumatically assisted atomized fuel pre-dispensing device according to claim 8,
the oil outlet pipelines (114) are circumferentially arranged along the periphery of the vent groove (123) and are arranged in a concentric ring with the vent groove (123).
10. A pneumatically assisted atomized fuel pre-dispensing device according to claim 1,
the outer wall surface of the sleeve ring body (1) is provided with a mounting edge (13) extending outwards in the radial direction, and the sleeve ring body (1) is fixedly mounted with the diffuser (3) through the mounting edge (13).
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| CN202010449949.5A CN111578313B (en) | 2020-05-25 | 2020-05-25 | Fuel oil pre-distribution device for pneumatic auxiliary atomization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112392602A (en) * | 2020-11-16 | 2021-02-23 | 四川航天中天动力装备有限责任公司 | Oil thrower disc of turbine engine |
| CN112524640A (en) * | 2020-11-30 | 2021-03-19 | 北京动力机械研究所 | Secondary distribution oil supply structure |
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| CN103216333A (en) * | 2013-04-08 | 2013-07-24 | 南京理工大学 | Countercurrent tangential type micro turbojet engine |
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| CN106196170A (en) * | 2016-07-21 | 2016-12-07 | 中国航空动力机械研究所 | Centrifugal oil swirling atomization structure |
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| CN112524640A (en) * | 2020-11-30 | 2021-03-19 | 北京动力机械研究所 | Secondary distribution oil supply structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111578313B (en) | 2021-11-12 |
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