CN112303664A - Integrated afterburner of preheating double-oil-way annular flame stabilizer - Google Patents
Integrated afterburner of preheating double-oil-way annular flame stabilizer Download PDFInfo
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- CN112303664A CN112303664A CN202011158442.0A CN202011158442A CN112303664A CN 112303664 A CN112303664 A CN 112303664A CN 202011158442 A CN202011158442 A CN 202011158442A CN 112303664 A CN112303664 A CN 112303664A
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- flame stabilizer
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- inner cone
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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
Abstract
The invention provides an integrated afterburner with a preheating double-oil-way annular flame stabilizer, which comprises an afterburner inner cone, a central annular flame stabilizer, an outer annular flame stabilizer, an inner annular flame stabilizer and a radial flame stabilizer. The invention adopts a double-oil-way injection mode to mix fuel oil and air, enhances atomization mixing and widens the oil supply range of the engine; an air inlet groove is formed in the boosting inner cone, and fuel oil in a fuel oil channel which is close to the air inlet groove in the boosting inner cone is evaporated and atomized, so that the fuel oil atomization effect is effectively improved, the combustion efficiency is further improved, the weight of a boosting combustion chamber is reduced, and the thrust-weight ratio is improved; a radial flame stabilizer is arranged behind the air inlet groove, so that the speed of incoming flow entering the air inlet groove is reduced, and the flame stabilizing effect is achieved; the working condition process from small stress application to maximum stress application is realized by controlling the radial direction and the jet hole at the tail part of the annular flame stabilizer to spray oil; the radial flame stabilizers are distributed in a staggered manner, so that the effect of stabilizing flame in a low-speed backflow area is achieved.
Description
Technical Field
The invention relates to the technical field of aero-engines, in particular to an integrated afterburner of a preheating double-oil-way annular flame stabilizer.
Background
With the rapid development of turbofan engines in the late 60 s of the 20 th century and the advent of variable cycle engines in the 70 s, afterburners were used as an important technology to enhance engine mobility. The function of the engine is mainly to increase the thrust of the engine and enhance the maneuverability of the airplane on a military engine. For most engines, after the boost is switched on, the thrust is increased by about 50% compared with the thrust in the maximum state, and the fuel consumption rate is high after the boost is switched on, so the engine only works in the state of rapid acceleration during takeoff, climbing and fighting of a military aircraft.
The afterburner is positioned between the turbine and the tail nozzle, high-temperature gas discharged from the turbine is subjected to diffusion and is mixed with fuel oil sprayed by the oil spraying device, the mixture is ignited and combusted at the tail part of the flame stabilizer, finally, heat is transmitted backwards, and energy is released through the nozzle to generate thrust.
Since the flame holder, oil supply and ignition are not operated when no force is applied, this results in a large loss of flow resistance and ineffective resistance. Therefore, on the premise of ensuring stable combustion, the oil supply device and the flame stabilizer are designed into a whole in the afterburner, so that the flow resistance coefficient of each part is reduced when the afterburner is not switched on to reduce the fluid resistance. Meanwhile, the length and the weight of the afterburner can be reduced, and the thrust-weight ratio of the engine is improved. The fuel atomization effect and the fuel injection mode in the afterburner play a vital role in the combustion efficiency and the combustion stability of the afterburner, and the fuel is preheated and atomized, so that the fuel and the fuel can be uniformly mixed, and the combustion stability and the combustion efficiency are improved.
Disclosure of Invention
Technical problem to be solved
Afterburners also currently suffer from problems such as excessive flow resistance losses in the afterburner during "cold conditions". And the afterburner is integrally designed, so that the complex structure in the afterburner can be reduced, the cold flow resistance loss is reduced, the length of the afterburner is shortened, the weight is reduced, and the thrust-weight ratio is improved. The heat of high-temperature fuel gas in the afterburner is transferred to low-temperature fuel oil by arranging the air inlet groove, so that the fuel oil can be evaporated and preheated, and the combustion efficiency is improved.
Technical scheme
The invention provides an integrated afterburner of a preheating double-oil-way annular flame stabilizer, which has the following basic structure: a fuel oil channel is arranged at the center of a boosting inner cone of the boosting combustion chamber, and a direct injection type or centrifugal fuel oil nozzle is arranged at the tail part of the boosting inner cone for fuel oil injection. The boosting inner cone is connected with the central annular flame stabilizer through the radial flame stabilizer, a hollow fuel oil channel is arranged inside the connecting mechanism and the annular flame stabilizer, and direct injection type fuel oil nozzles are uniformly arranged at the tail part of the central annular flame stabilizer. The double-oil-way injection mode is formed, and has the advantages that the double-oil-way injection can better mix fuel oil and air, enhance atomization mixing and simultaneously widen the oil supply range of the engine. Air inlet grooves are uniformly formed in the boosting inner cone, high-temperature gas exhausted by the turbine enters the boosting inner cone through the air inlet grooves to evaporate and atomize fuel oil in an internal fuel oil channel, heat is absorbed, the atomization effect of the fuel oil is improved, the combustion efficiency is further improved, meanwhile, the weight of a boosting combustion chamber can be reduced, and the thrust-weight ratio is improved. Meanwhile, the speed of the incoming flow gas is reduced after entering the gas inlet groove, and the effect of stabilizing flame is achieved. Two sides of the central annular flame stabilizer are connected with two symmetrical small annular stabilizers through radial flame stabilizers with fuel oil channels, and the tail parts of the two small annular flame stabilizers are also provided with direct-injection fuel oil nozzles. The tail parts of the radial flame stabilizers are provided with direct injection type fuel oil spray holes, and the spray holes are reasonably controlled to spray oil, so that the working condition process from small force application to maximum force application is realized, and different force application ratios are realized. The radial flame stabilizers are distributed in a staggered manner so as to achieve the effect of stabilizing flame in a low-speed backflow area.
It can be seen that the main structural features and preferred features of the present invention include the shape of the air inlet groove of the stressing inner cone, the distribution of the fuel passages in the stressing inner cone and the flame stabilizer, the distribution of the fuel injection holes at the tail of the flame stabilizer and the tail of the stressing inner cone, the design of the radial flame stabilizer and the annular flame stabilizer, and the opening of the fuel injection holes under different stressing conditions.
The technical scheme of the invention is as follows:
an integrated afterburner of a preheating double-oil-way annular flame stabilizer comprises an afterburner inner cone, a central annular flame stabilizer, an outer annular flame stabilizer, an inner annular flame stabilizer and a radial flame stabilizer;
the central axis of the afterburning inner cone is arranged at the central axis of the afterburning chamber casing; the front part of the stressing inner cone is provided with a plurality of oil inlets, and the side surface and the rear end of the stressing inner cone are provided with a plurality of oil outlets; a plurality of fuel oil channels communicated with the oil inlet and the oil outlet are arranged in the stress application inner cone; the oil outlet at the rear end of the stressing inner cone is a fuel injection hole;
the side wall of the stressing inner cone is provided with an air inlet groove along the incoming flow direction, the air inlet groove corresponds to the position of the fuel oil channel in the stressing inner cone, and fuel oil in the fuel oil channel in the stressing inner cone can be evaporated and atomized by high-temperature fuel gas in the air inlet groove;
the central annular flame stabilizer is arranged on the rear side of the boosting inner cone along the incoming flow direction, and the central axis of the central annular flame stabilizer is arranged at the central axis position of the boosting combustor casing; the fuel oil channel is arranged in the central annular flame stabilizer, and the fuel oil channel oil inlet of the central annular flame stabilizer is fixedly connected with the thrust augmentation inner cone side oil outlet through a plurality of radial flame stabilizers containing fuel oil channels and communicated with a fuel oil passage; the central annular flame stabilizer is provided with an oil outlet on the side wall and a plurality of uniformly distributed fuel oil injection holes on the rear end surface back to the incoming flow direction;
the outer annular flame stabilizer and the inner annular flame stabilizer are arranged on the rear side of the central annular flame stabilizer along the incoming flow direction, the radius of the outer annular flame stabilizer is larger than that of the central annular flame stabilizer, the radius of the inner annular flame stabilizer is smaller than that of the central annular flame stabilizer, and the central axes of the outer annular flame stabilizer and the inner annular flame stabilizer are both arranged on the central axis of the afterburner casing; fuel oil channels are arranged in the outer annular flame stabilizer and the inner annular flame stabilizer, and fuel oil channel oil inlets of the outer annular flame stabilizer and the inner annular flame stabilizer are fixedly connected with a side oil outlet of the central annular flame stabilizer through a plurality of radial flame stabilizers containing fuel oil channels and communicated with a fuel oil passage; the outer side annular flame stabilizer and the inner side annular flame stabilizer are provided with a plurality of uniformly distributed fuel oil injection holes on the rear end surface back to the incoming flow direction;
the side wall of the outer annular flame stabilizer is fixedly connected with the afterburner casing through a force bearing support;
the radial flame stabilizer is provided with a plurality of fuel injection holes which are uniformly distributed on the rear end surface back to the incoming flow direction.
Furthermore, the number of the oil inlets is the same as that of oil outlets on the side face of the stress application inner cone, an independent fuel oil channel is arranged behind the oil inlets, and the independent fuel oil channel is divided into a plurality of paths of independent fuel oil channels after being converged inside the stress application inner cone to communicate the oil outlets on the side face and the rear end of the stress application inner cone.
Further, the air inlet groove is provided with an air inlet and an air outlet on the side wall surface of the stress application inner cone, and an air flow channel is formed between the air inlet and the air outlet; the number of the air inlet grooves is the same as that of the oil inlets of the stress application inner cones, the air inlet grooves correspond to the independent fuel oil channels behind the oil inlets and the independent fuel oil channels communicated with the side oil outlets of the stress application inner cones one by one, and the distance between the independent fuel oil channels behind the oil inlets and the independent fuel oil channels communicated with the side oil outlets of the stress application inner cones and the corresponding air flow channels is 10-20 mm.
Furthermore, the air outlet of the air inlet groove on the side wall surface of the stressing inner cone is positioned at the front side of the oil outlet on the side surface of the corresponding stressing inner cone in the incoming flow direction.
Furthermore, the ends of the central annular flame stabilizer, the outer annular flame stabilizer and the inner annular flame stabilizer facing the incoming flow direction are all smooth curved surfaces, and the end facing away from the incoming flow direction is an inner concave surface.
Furthermore, the fuel injection holes at the rear end of the stressing inner cone are divided into a stressing inner cone central large fuel injection hole at the axial position of the stressing inner cone and a plurality of stressing inner cone fuel injection holes distributed in an annular array around the central axis.
Furthermore, the radial flame stabilizer is a triangular block-shaped structure, the radial flame stabilizer is wedge-shaped towards the incoming flow direction, a plurality of fuel injection holes are uniformly distributed in the direction opposite to the incoming flow direction, and fuel inlets or outlets are formed in the two ends of the radial flame stabilizer.
Further, all the radial flame stabilizers are arranged in a staggered mode in the circumferential direction.
Furthermore, the diameter of an oil inlet at the front end of the stress application inner cone is 8-15 mm; the diameter of a fuel oil channel from an oil inlet at the front end of the stressing inner cone to an oil outlet at the side surface of the stressing inner cone is 8-15 mm, and the length of the fuel oil channel is 100-400 mm; the diameter of a large fuel injection hole at the center of the stressing inner cone is 2mm, the number of the stressing inner cone fuel injection holes distributed around the central axis in an annular array is 14-19, and the diameter of the stressing inner cone fuel injection holes is 0.5mm-2 mm; two rows of fuel injection holes are uniformly distributed at the tail part of the radial flame stabilizer, the diameter of each injection hole is 0.5mm-1.5mm, and the number of each row of fuel injection holes is 6-10; the diameter of a fuel injection hole at the tail part of the central annular flame stabilizer is 0.5mm-2mm, the diameter of fuel injection holes of the annular flame stabilizers at two sides is 0.5mm-1.5mm, the fuel injection holes are annularly distributed in two rings along the circumferential direction of the annular flame stabilizer, and the number of injection holes in each ring is 60-100;
the maximum thickness of a radial flame stabilizer connected with the stress application inner cone and the central annular flame stabilizer is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 250mm-400 mm; the maximum thickness of the radial flame stabilizer between the central annular flame stabilizer and the small annular flame stabilizers which are symmetrical on two sides is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 150mm-300 mm;
the thickness of the central annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 200-350 mm, the diameter is 600-800 mm, the thickness of the outer annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 100-250 mm, the diameter is 800-1000 mm, the thickness of the inner annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 100-250 mm, and the diameter is 400-600 mm.
Furthermore, fuel injection holes at the tail of each flame stabilizer can be independently controlled to inject fuel according to different stress application working condition requirements.
Advantageous effects
The invention provides an integrated afterburner of a preheating double-oil-way annular flame stabilizer, which has the beneficial effects that: by adopting the injection mode of double oil ways, fuel oil and air can be better mixed, atomization mixing is enhanced, and the oil supply range of the engine can be widened; the air inlet groove is formed in the boosting inner cone, so that fuel oil in a fuel oil channel which is close to the air inlet groove in the boosting inner cone can be evaporated and atomized, heat is absorbed, the atomization effect of the fuel oil can be effectively improved, the combustion efficiency is improved, the weight of a boosting combustion chamber can be reduced, and the thrust-weight ratio is improved; meanwhile, a radial flame stabilizer is arranged behind the air inlet groove, so that the speed of the incoming air entering the air inlet groove is reduced, and the effect of stabilizing flame is achieved; by reasonably controlling the radial direction and the jet hole at the tail part of the annular flame stabilizer to spray oil, the working condition process from small force application to maximum force application can be realized, and different force application ratios can be realized; the radial flame stabilizers are distributed in a staggered manner to achieve the effect of stabilizing the flame in a low-speed backflow area.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1: two-dimensional section schematic diagram of integrated afterburner of preheating double-oil-way annular flame stabilizer
FIG. 2: left view of integrated afterburner of preheating double-oil-way annular flame stabilizer
FIG. 3: single radial flame holder schematic
FIG. 4: single ring flame stabilizer schematic
FIG. 5: inner cone diagram of force application
FIG. 6: section view of stress application inner cone
In fig. 1: 1-stress application inner cone, 2-air inlet groove, 3-fuel channel, 4-radial flame stabilizer, 5-central annular flame stabilizer, 6-inner annular flame stabilizer, 7-outer annular flame stabilizer, 8-casing, 9-force bearing support and 10-stress application inner cone central large fuel injection hole
In fig. 2: 4-radial flame holder, 5-central annular flame holder, 6-inner annular flame holder, 7-outer annular flame holder
In fig. 3: 11-radial flame stabilizer fuel injection hole
In fig. 4: 12-ring flame stabilizer fuel injection hole
In fig. 5: 1-boosting inner cone, 2-air inlet groove, 10-boosting inner cone central large fuel oil jet hole, 13-boosting inner cone fuel oil jet hole, 14-fuel oil channel at the joint of radial flame stabilizer
In fig. 6: 2-air inlet groove, 3-fuel channel
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and not to be construed as limiting the invention.
The integrated afterburner of the preheating double-oil-way annular flame stabilizer in the embodiment comprises an afterburner inner cone, a central annular flame stabilizer, an outer annular flame stabilizer, an inner annular flame stabilizer and a radial flame stabilizer.
The central axis of the afterburning inner cone is arranged at the central axis of the afterburning chamber casing; the front part of the stressing inner cone is uniformly provided with 4 oil inlets, the side surface of the stressing inner cone is provided with 4 oil outlets, and the rear end of the stressing inner cone is provided with a fuel injection hole; an independent fuel oil channel is arranged behind the oil inlet of the stressing inner cone, and 4 independent fuel oil channels are divided into 5 paths of independent fuel oil channels after being converged inside the stressing inner cone and communicated with 4 oil outlets on the side surface of the stressing inner cone and a fuel oil jet hole at the rear end.
In the embodiment, the fuel injection holes at the rear end of the stressing inner cone are divided into a stressing inner cone central large fuel injection hole at the axial position of the stressing inner cone and a plurality of stressing inner cone fuel injection holes distributed in an annular array around the central axis. Specifically, the diameter of an oil inlet at the front end of the stress application inner cone is 8-15 mm; the diameter of a fuel oil channel from an oil inlet at the front end of the stressing inner cone to an oil outlet at the side surface of the stressing inner cone is 8-15 mm, and the length of the fuel oil channel is 100-400 mm; the diameter of the large fuel oil injection hole in the center of the stressing inner cone is 2mm, the number of the stressing inner cone fuel oil injection holes distributed around the central axis in an annular array is 14-19, and the diameter of the stressing inner cone fuel oil injection holes is 0.5mm-2 mm.
The side wall of the stressing inner cone is provided with an air inlet groove along the incoming flow direction, the air inlet groove corresponds to the position of the fuel oil channel in the stressing inner cone, and fuel oil in the fuel oil channel in the stressing inner cone can be evaporated and atomized by high-temperature fuel gas in the air inlet groove.
Specifically, as shown in fig. 5, the air inlet groove in this embodiment is embedded inside the stressing inner cone, that is, the air inlet groove has an air inlet and an air outlet on a side wall surface of the stressing inner cone, and an air flow channel is formed between the air inlet and the air outlet. The number of the air inlet grooves is the same as that of the oil inlets of the stressing inner cones, the number of the air inlet grooves is 4, the air inlet grooves correspond to the independent fuel channels behind the oil inlets and the independent fuel channels communicated with the oil outlets on the side surfaces of the stressing inner cones one by one, and the distance between the air inlet grooves and the independent fuel channels is 10-20 mm, so that each air inlet groove can evaporate and atomize fuel in one independent fuel channel from the inlet to the outlet.
And the gas outlet of the gas inlet groove on the stress application inner cone side wall surface is positioned at the front side of the corresponding stress application inner cone side oil outlet in the incoming flow direction, and the radial flame stabilizer is connected at the position of the stress application inner cone side oil outlet, namely the radial flame stabilizer is closely arranged behind the gas inlet groove, so that the speed reduction of incoming flow gas entering the gas inlet groove can be realized in the flow field, and the flame stabilizing effect can also be achieved.
The central annular flame stabilizer is arranged on the rear side of the boosting inner cone along the incoming flow direction, and the central axis of the central annular flame stabilizer is arranged at the central axis position of the boosting combustor casing; the fuel oil channel is arranged in the central annular flame stabilizer, and the fuel oil channel oil inlet of the central annular flame stabilizer is fixedly connected with the thrust augmentation inner cone side oil outlet through 4 radial flame stabilizers containing fuel oil channels and communicated with a fuel oil passage; one end of the central annular flame stabilizer facing the incoming flow direction is a smooth curved surface, and the other end of the central annular flame stabilizer facing away from the incoming flow direction is an inner concave surface; the central annular flame stabilizer is provided with an oil outlet on the side wall, and a plurality of fuel injection holes which are uniformly distributed are arranged on the concave surface at the rear end back to the incoming flow direction.
The outer annular flame stabilizer and the inner annular flame stabilizer are arranged on the rear side of the central annular flame stabilizer along the incoming flow direction, the radius of the outer annular flame stabilizer is larger than that of the central annular flame stabilizer, the radius of the inner annular flame stabilizer is smaller than that of the central annular flame stabilizer, and the central axes of the outer annular flame stabilizer and the inner annular flame stabilizer are both arranged on the central axis of the afterburner casing; fuel oil channels are arranged in the outer annular flame stabilizer and the inner annular flame stabilizer, and fuel oil channel oil inlets of the outer annular flame stabilizer and the inner annular flame stabilizer are fixedly connected with a side oil outlet of the central annular flame stabilizer through 4 radial flame stabilizers containing fuel oil channels respectively and communicated with a fuel oil passage; the outer side annular flame stabilizer and the inner side annular flame stabilizer are smooth curved surfaces at the ends facing the incoming flow direction, the end facing away from the incoming flow direction is an inner concave surface, and a plurality of uniformly distributed fuel oil injection holes are formed in the inner concave surface.
The side wall of the outer annular flame stabilizer is fixedly connected with the afterburner casing through a force bearing support.
In this embodiment, the thickness of the central annular flame holder is 20mm to 40mm, the width in the incoming flow direction is 200mm to 350mm, the diameter is 600mm to 800mm, the thickness of the outer annular flame holder is 20mm to 40mm, the width in the incoming flow direction is 100mm to 250mm, the diameter is 800mm to 1000mm, the thickness of the inner annular flame holder is 20mm to 40mm, the width in the incoming flow direction is 100mm to 250mm, and the diameter is 400mm to 600 mm.
The diameter of a fuel injection hole at the tail part of the central annular flame stabilizer is 0.5mm-2mm, the diameter of fuel injection holes of the annular flame stabilizers at two sides is 0.5mm-1.5mm, the fuel injection holes are annularly distributed in two rings along the circumferential direction of the annular flame stabilizer, and the number of the injection holes in each ring is 60-100.
As shown in fig. 3, the radial flame stabilizer is a triangular block-shaped structure, which is wedge-shaped towards the incoming flow direction, has a plurality of fuel injection holes uniformly distributed in the direction opposite to the incoming flow direction, and has fuel inlets or outlets at two ends.
In the embodiment, the maximum thickness of the radial flame stabilizer connected with the stress application inner cone and the central annular flame stabilizer is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 250mm-400 mm; the maximum thickness of the radial flame stabilizer between the central annular flame stabilizer and the small annular flame stabilizers which are symmetrical on two sides is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 150mm-300 mm.
The total 12 radial flame stabilizers are distributed at intervals in the circumferential direction to achieve the effect of stabilizing the flame in a low-speed backflow region, and the radial central angle of every two adjacent radial flame stabilizers is 30 DEG
Two rows of fuel injection holes are uniformly distributed on the rear end face of the radial flame stabilizer back to the incoming flow direction, the diameter of each injection hole is 0.5mm-1.5mm, and the number of each row of fuel injection holes is 6-10.
According to different stress application working condition requirements, fuel injection holes at the tail part of each flame stabilizer can be independently controlled to inject fuel; the oil injection of the oil injection hole at the tail part of the flame stabilizer is reasonably controlled, so that the working condition process from small force application to maximum force application is realized, and different force application ratios are realized.
The integrated afterburner of the preheating double-oil-way annular flame stabilizer provided by the embodiment adopts a double-oil-way injection mode, and fuel oil is injected at the afterbody of the afterbody inner cone in the stress application of figure 1, the radial flame stabilizer in the figure 3 and the annular flame stabilizer in the figure 4. Meanwhile, an air inlet groove is formed in the afterburning inner cone, fuel in a fuel channel inside the afterburning inner cone is preheated and evaporated, the temperature of an afterburning chamber is reduced, the fuel atomization effect is improved, the combustion efficiency is further improved, the air speed is reduced, and the effect of stabilizing flame is achieved. The fuel oil spray holes at the tail part of the flame stabilizer are reasonably controlled to spray oil, so that the working condition from small force application to maximum force application can be realized.
The fuel oil enters the afterburning chamber through the fuel oil channel in the afterburning inner cone, and after the high-temperature fuel gas flows into the air inlet groove due to the fact that the fuel oil channel is close to the air inlet groove, the fuel oil in the fuel oil channel absorbs heat, the temperature is gradually increased, and the fuel oil is preheated and gradually evaporated. Part of fuel oil is directly sprayed out through a direct injection type or centrifugal type spray hole at the tail part of the boosting inner cone and is mixed and combusted with fuel gas in a low-speed backflow area behind the boosting inner cone; the other part of fuel oil enters the annular flame stabilizer through the radial flame stabilizer, is sprayed out from a direct-injection fuel oil injection hole at the tail part of the flame stabilizer after being secondarily heated by high-temperature fuel gas, and is fully mixed with the high-temperature fuel gas in a low-speed backflow area behind the radial flame stabilizer and the annular flame stabilizer for combustion. This is the double oil circuit mode of supplying oil, can widen the fuel feeding range of engine. After entering the air inlet groove of the boosting inner cone, high-temperature gas flows through the radial flame stabilizer, so that the flow rate of the high-temperature gas is reduced, the high-temperature gas is favorably mixed with fuel oil, and stable combustion in a low-speed backflow area is formed. The radial flame stabilizers are distributed in a staggered manner, so that the air flow speed is reduced, and the flame is stabilized. When the semi-stressing working condition is switched on, fuel oil injection holes on the stressing inner cone, the central large annular flame stabilizer, the inner small annular flame stabilizer and the radial flame stabilizer are all opened, and the rest are closed; when the full stress application state is switched on, the fuel injection holes on the outer annular flame stabilizer are gradually opened to the full state, so that different stress application working conditions are realized.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. The utility model provides a preheat two oil circuit annular flame holder's integration afterburner which characterized in that: comprises a stress application inner cone, a central annular flame stabilizer, an outer annular flame stabilizer, an inner annular flame stabilizer and a radial flame stabilizer;
the central axis of the afterburning inner cone is arranged at the central axis of the afterburning chamber casing; the front part of the stressing inner cone is provided with a plurality of oil inlets, and the side surface and the rear end of the stressing inner cone are provided with a plurality of oil outlets; a plurality of fuel oil channels communicated with the oil inlet and the oil outlet are arranged in the stress application inner cone; the oil outlet at the rear end of the stressing inner cone is a fuel injection hole;
the side wall of the stressing inner cone is provided with an air inlet groove along the incoming flow direction, the air inlet groove corresponds to the position of the fuel oil channel in the stressing inner cone, and fuel oil in the fuel oil channel in the stressing inner cone can be evaporated and atomized by high-temperature fuel gas in the air inlet groove;
the central annular flame stabilizer is arranged on the rear side of the boosting inner cone along the incoming flow direction, and the central axis of the central annular flame stabilizer is arranged at the central axis position of the boosting combustor casing; the fuel oil channel is arranged in the central annular flame stabilizer, and the fuel oil channel oil inlet of the central annular flame stabilizer is fixedly connected with the thrust augmentation inner cone side oil outlet through a plurality of radial flame stabilizers containing fuel oil channels and communicated with a fuel oil passage; the central annular flame stabilizer is provided with an oil outlet on the side wall and a plurality of uniformly distributed fuel oil injection holes on the rear end surface back to the incoming flow direction;
the outer annular flame stabilizer and the inner annular flame stabilizer are arranged on the rear side of the central annular flame stabilizer along the incoming flow direction, the radius of the outer annular flame stabilizer is larger than that of the central annular flame stabilizer, the radius of the inner annular flame stabilizer is smaller than that of the central annular flame stabilizer, and the central axes of the outer annular flame stabilizer and the inner annular flame stabilizer are both arranged on the central axis of the afterburner casing; fuel oil channels are arranged in the outer annular flame stabilizer and the inner annular flame stabilizer, and fuel oil channel oil inlets of the outer annular flame stabilizer and the inner annular flame stabilizer are fixedly connected with a side oil outlet of the central annular flame stabilizer through a plurality of radial flame stabilizers containing fuel oil channels and communicated with a fuel oil passage; the outer side annular flame stabilizer and the inner side annular flame stabilizer are provided with a plurality of uniformly distributed fuel oil injection holes on the rear end surface back to the incoming flow direction;
the side wall of the outer annular flame stabilizer is fixedly connected with the afterburner casing through a force bearing support;
the radial flame stabilizer is provided with a plurality of fuel injection holes which are uniformly distributed on the rear end surface back to the incoming flow direction.
2. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: the oil inlet quantity is the same with afterburning interior cone side oil-out quantity, has independent fuel oil passageway behind the oil inlet, and independent fuel oil passageway is after afterburning the inside back that converges of awl, and the subdivision is the independent fuel oil passageway of multichannel, the oil-out of afterburning interior cone side and rear end of intercommunication.
3. The integrated afterburner of a preheated dual oil path annular flame holder of claim 2, wherein: the air inlet groove is provided with an air inlet and an air outlet on the side wall surface of the stress application inner cone, and an air flow channel is formed between the air inlet and the air outlet; the number of the air inlet grooves is the same as that of the oil inlets of the stress application inner cones, the air inlet grooves correspond to the independent fuel oil channels behind the oil inlets and the independent fuel oil channels communicated with the side oil outlets of the stress application inner cones one by one, and the distance between the independent fuel oil channels behind the oil inlets and the independent fuel oil channels communicated with the side oil outlets of the stress application inner cones and the corresponding air flow channels is 10-20 mm.
4. The integrated afterburner of a preheated dual oil path annular flame holder of claim 3, wherein: and the air outlet of the air inlet groove on the side wall surface of the stress application inner cone is positioned at the front side of the corresponding stress application inner cone side oil outlet in the incoming flow direction.
5. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: the central annular flame stabilizer, the outer annular flame stabilizer and the inner annular flame stabilizer are all smooth curved surfaces at one ends facing the incoming flow direction, and are concave surfaces at one ends facing away from the incoming flow direction.
6. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: the fuel injection holes at the rear end of the boosting inner cone are divided into a boosting inner cone center large fuel injection hole at the axis position of the boosting inner cone and a plurality of boosting inner cone fuel injection holes distributed in an annular array around the central axis.
7. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: the radial flame stabilizer is of a triangular block-shaped structure, the radial flame stabilizer is wedge-shaped towards the incoming flow direction, a plurality of fuel injection holes are uniformly distributed in the direction opposite to the incoming flow direction, and fuel inlets or outlets are formed in two ends of the radial flame stabilizer.
8. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: all the radial flame stabilizers are distributed at intervals in a staggered mode in the circumferential direction.
9. The integrated afterburner of a preheated dual oil path annular flame holder of claim 6, wherein: the diameter of an oil inlet at the front end of the stressing inner cone is 8-15 mm; the diameter of a fuel oil channel from an oil inlet at the front end of the stressing inner cone to an oil outlet at the side surface of the stressing inner cone is 8-15 mm, and the length of the fuel oil channel is 100-400 mm; the diameter of a large fuel injection hole at the center of the stressing inner cone is 2mm, the number of the stressing inner cone fuel injection holes distributed around the central axis in an annular array is 14-19, and the diameter of the stressing inner cone fuel injection holes is 0.5mm-2 mm; two rows of fuel injection holes are uniformly distributed at the tail part of the radial flame stabilizer, the diameter of each injection hole is 0.5mm-1.5mm, and the number of each row of fuel injection holes is 6-10; the diameter of a fuel injection hole at the tail part of the central annular flame stabilizer is 0.5mm-2mm, the diameter of fuel injection holes of the annular flame stabilizers at two sides is 0.5mm-1.5mm, the fuel injection holes are annularly distributed in two rings along the circumferential direction of the annular flame stabilizer, and the number of injection holes in each ring is 60-100;
the maximum thickness of a radial flame stabilizer connected with the stress application inner cone and the central annular flame stabilizer is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 250mm-400 mm; the maximum thickness of the radial flame stabilizer between the central annular flame stabilizer and the small annular flame stabilizers which are symmetrical on two sides is 20mm-40mm, the width along the incoming flow direction is 100mm-250mm, and the height is 150mm-300 mm;
the thickness of the central annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 200-350 mm, the diameter is 600-800 mm, the thickness of the outer annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 100-250 mm, the diameter is 800-1000 mm, the thickness of the inner annular flame stabilizer is 20-40 mm, the width along the incoming flow direction is 100-250 mm, and the diameter is 400-600 mm.
10. The integrated afterburner of a preheated dual oil path annular flame holder of claim 1, wherein: according to different stress application working condition requirements, fuel injection holes at the tail part of each flame stabilizer can be independently controlled to inject fuel.
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