CN110822475B - On-duty flame stabilizer using air cooling structure to match ignition position and design method - Google Patents
On-duty flame stabilizer using air cooling structure to match ignition position and design method Download PDFInfo
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- CN110822475B CN110822475B CN201911098947.XA CN201911098947A CN110822475B CN 110822475 B CN110822475 B CN 110822475B CN 201911098947 A CN201911098947 A CN 201911098947A CN 110822475 B CN110822475 B CN 110822475B
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- 238000001816 cooling Methods 0.000 title claims abstract description 117
- 239000003381 stabilizer Substances 0.000 title claims abstract description 99
- 238000013461 design Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000000889 atomisation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 17
- 239000002737 fuel gas Substances 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 6
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- 238000002679 ablation Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 2
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- 239000000112 cooling gas Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
- F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
- F23R3/20—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants incorporating fuel injection means
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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
- F23R3/283—Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
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Abstract
The invention discloses an on-duty flame stabilizer using an air cooling structure to match an ignition position and a design method. The on-duty flame holder includes a flame holder body, a swirler and an igniter. Because the cooling holes are formed in the stabilizer, the outer culvert cooling air is guided to form a thin air film on the wall surface of the hot side, so that the thermal protection of the stabilizer is realized, and the cooling holes in local positions can be encrypted according to the temperature distribution of the wall of the stabilizer. The fillet at the stabilizer restraines the emergence of flowing the separation, effectively prevents to be located the hot gas of stabilizer hot side and advances the cold gas side through the cooling hole refluence, avoids stabilizer wall temperature too high and takes place to ablate. The invention utilizes the combination of different opening directions of the cooling holes on the stabilizer to realize the active control of the flow field structure of the flame stabilizer on duty, effectively reduces the temperature of the wall surface at the hot side of the stabilizer and prolongs the service life of the stabilizer in high-temperature fuel gas. The invention has simple structure, and improves the ignition reliability, the flame stability and the autonomous controllability of the ignition position arrangement.
Description
Technical Field
The invention relates to the technical field of aviation power propulsion systems, in particular to an on-duty flame stabilizer using an air cooling structure to match an ignition position and a design method.
Background
With the continuous development of modern advanced aero-engine technology, the turbofan engine gradually replaces the earlier developed turbojet engine with the advantages of high economy, good operational performance and the like in a cruising state. In order to ensure that the turbofan afterburner can work stably, the afterburner is required to implement soft ignition, namely ignition is carried out under a very low oil-gas ratio, and the function can be realized by adopting an on-duty flame stabilizer. The large backflow area behind the on-duty flame stabilizer has the function of spreading the flame with stable inside outwards, and the on-duty stabilizer is an effective measure for improving the stable combustion of mixed gas and expanding the stable working range. The currently mainly used on-duty flame stabilizer mainly comprises: v-shaped flame stabilizer, double V-shaped flame stabilizer, film evaporation V-shaped duty stabilizer, special evaporation V-shaped flame stabilizer, evaporation type flame stabilizer, sand dune standing vortex flame stabilizer and the like.
The flame stabilizer on duty is a core component for ensuring stable combustion of the afterburner of the aircraft engine, the service life and the ignition performance of the flame stabilizer are improved, and the working reliability of the turbofan afterburner is ensured. With the development of modern advanced turbofan engines, in order to achieve a larger thrust-weight ratio, the temperature rise of the main combustion chamber is increased, the temperature of the gas in front of the turbine is obviously increased, and the incoming flow speed and temperature entering the afterburner are greatly increased. The increased incoming flow velocity places higher demands on the stability design of the flame stabilizer on duty. The improvement of the incoming flow temperature brings new challenges to the design work of the stabilizer, and in order to ensure that the stabilizer works stably and reliably under the high-temperature condition, the wall surface temperature of the stabilizer must be ensured within the range which can be borne by materials, and the flame stabilizer is prevented from being ablated by high-temperature fuel gas, so that a proper amount of cooling gas needs to be introduced to cool the stabilizer, and the service life of the stabilizer is prolonged.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing an on-duty flame stabilizer which utilizes an air cooling structure to match an ignition position, so that the working life and the reliability of the on-duty flame stabilizer under the condition of high-temperature gas are improved, the requirements of a afterburner on different ignition positions under the condition of high-temperature high-speed incoming flow are met, and the wide ignition and stable working range of the on-duty flame stabilizer is ensured. The invention also provides a design method of the flame stabilizer on duty by matching the air cooling structure with the ignition position.
The technical scheme is as follows: in order to achieve the above object, the flame stabilizer on duty using an air cooling structure to match an ignition position according to the present invention includes a flame stabilizer main body, wherein the flame stabilizer main body includes a front plate extending horizontally, an inclined plate disposed at a rear end of the front plate and extending obliquely upward, and a rear plate disposed at a rear end of the inclined plate and extending horizontally; a concave cavity is formed below the structure formed by the inclined plate and the rear plate; the back plate is provided with a centrifugal nozzle and an igniter; rounding off the joint of the inclined plate and the rear plate on the side wall surface of the cold air; the flame stabilizer main body is provided with a plurality of cooling holes as air cooling structures.
The air cooling structure is air film cooling, and the special treatment of the fillet at the corner of the side wall surface of the cold air side of the stabilizer can effectively prevent the ablation of the stabilizer caused by the backflow of high-temperature fuel gas at the hot side into the cold air side through the cooling hole, so the cooling and structural scheme can ensure the service life and the reliability of the stabilizer under the condition of high-temperature fuel gas.
The inclined plate and the rear plate of the flame stabilizer main body form a concave cavity-shaped structure, a high-temperature and high-speed main flow is included to form a low-speed backflow area in the concave cavity, and a high oil-gas ratio can be locally kept in the backflow area under a lean oil state, so that the wide ignition and stable working range of the flame stabilizer on duty is ensured.
The joint of the inclined plate and the rear plate on the outer side wall surface of the flame stabilizer main body, namely the corner, adopts a fillet treatment mode, so that the flow separation of cold airflow of the outer culvert channel at the corner can be inhibited, and the high-temperature fuel gas on the hot side is prevented from flowing back to the cold airflow side through the cooling hole to cause the ablation of the stabilizer.
The air cooling structure comprises a plurality of first cooling holes arranged on the inclined plate and a plurality of second cooling holes arranged on the rear plate.
The opening angle of the first cooling hole on the inclined plate is an included angle alpha between the opening direction of the first cooling hole and the inclined plate; the opening angle of the second cooling hole on the rear plate is an included angle beta between the opening direction of the second cooling hole and the rear plate; the included angle alpha and the included angle beta are the same or different.
The arrangement modes of the first cooling holes and the second cooling holes are all in a socket arrangement mode, when the on-duty flame stabilizer is stably combusted, the high-temperature area is in the cavity and is subjected to heat transfer and radiation, the inclined plate and the rear plate are high in temperature, the cooling holes are formed in the inclined plate and the rear plate, and the working life and the reliability of the on-duty flame stabilizer under the high-temperature gas condition can be effectively improved due to the socket arrangement.
The included angle between the inclined plate and the front plate is 60 degrees.
The centrifugal nozzle is a pressure atomizing nozzle, and the igniter is a high-energy igniter.
The invention relates to a design method of an on-duty flame stabilizer using an air cooling structure to match an ignition position, which comprises the following steps:
(a) designing specification parameters of the flame stabilizer main body, wherein the specification parameters comprise the length of a front plate and a rear plate (the distance between the front plate and the rear plate) which form the flame stabilizer main body, and determining an included angle theta between an inclined plate and the front plate or the rear plate;
(b) setting an air cooling structure: the inclined plate and the rear plate are thermally protected in a gas film cooling mode, the arrangement modes of the first cooling holes and the second cooling holes are arranged in a row, the aperture and the hole spacing of the cooling holes can be determined according to actual requirements, and meanwhile, the hole opening density of a local area is adjusted according to the temperature distribution condition of the hot side walls of the inclined plate and the rear plate during stable combustion, so that the cooling effect of the whole plate is controlled, and the optimal ignition position required by the afterburner is autonomously controlled;
(c) the opening angle of the first cooling hole on the inclined plate is an included angle alpha between the opening direction and the inclined plate, the opening angle of the second cooling hole on the rear plate is an included angle beta between the opening direction and the inclined plate, and the backflow area is controlled by utilizing different combinations of the opening directions of the first cooling hole and the second cooling hole, so that the independent control of the optimal ignition position required by the afterburner is realized;
(d) rounding off the joint of the inclined plate and the rear plate on the side wall surface of the cold air;
(e) selecting a centrifugal nozzle according to actual requirements of the afterburner on-duty ignition such as oil supply quantity, an atomization angle and the like, selecting an igniter according to the actual ignition energy requirement, and respectively determining the positions of the centrifugal nozzle and the igniter according to a flow field structure controlled by an air cooling structure and a matched ignition position.
Further, in step (e), the swirler is a conventional pressure atomization nozzle, and the igniter is a conventional high-energy igniter;
the positions of the centrifugal nozzle and the igniter can be respectively determined according to the flow field structure and the ignition position matched by the air cooling structure, so that the aims of improving the atomization effect, the combustion efficiency and the ignition performance of the flame stabilizer on duty and widening the ignition range are fulfilled.
The reflux zone is formed in the concave cavity, the structure of the reflux zone is basically not interfered by the flow velocity of the main flow of the inner culvert, the structure, the position and the size of the reflux zone can be actively controlled by the air cooling structure, and the optimal ignition position and the optimal ignition range are matched by the air cooling structure, so the design scheme can meet the requirements of different afterburner structures on the ignition position under the conditions of high temperature and high speed incoming flow. The flame stabilizer on duty adopts a centrifugal nozzle oil supply scheme, and in a lean oil state, a high oil-gas ratio can be locally kept in a backflow region due to a low-speed backflow region in the concave cavity, so that the wide ignition and stable working range of the flame stabilizer on duty can be ensured.
Has the advantages that: (1) according to the on-duty flame stabilizer using the air cooling structure to match the ignition position, the high-temperature wall surface of the stabilizer is cooled by adopting the air film, and the special treatment of chamfering at the corner of the cold air side wall surface of the stabilizer can effectively prevent the high-temperature fuel gas at the hot side from flowing back into the cold air side through the cooling hole to cause ablation of the stabilizer, so that the cooling and structural scheme can ensure the working life and reliability of the stabilizer under the condition of high-temperature fuel gas; (2) the backflow zone is formed in the cavity of the flame stabilizer main body, the structure of the backflow zone is basically not interfered by the flow velocity of the main flow of the connotation, the structure, the position and the size of the backflow zone can be actively controlled by the opening directions of the first cooling hole on the inclined plate and the second cooling hole on the rear plate, and the optimal ignition position and the optimal ignition range are matched by the air-cooled structure, so that the design scheme can meet the requirements of an afterburner on different ignition positions under the conditions of high temperature and high speed incoming flow, and the flame stabilizer with the class number has higher universality on different afterburner structures; (3) the on-duty flame stabilizer adopts the concave cavity of the centrifugal nozzle oil supply scheme, and under the lean state, a high oil-gas ratio can be locally kept in a backflow region due to the low-speed backflow region in the concave cavity, so that the wide ignition and stable working range of the on-duty flame stabilizer can be ensured; the positions of the centrifugal nozzle and the igniter can be respectively determined according to the flow field structure controlled by the air cooling structure and the matched ignition position, so that the aims of improving the atomization effect, the combustion efficiency and the ignition performance of the class-on-duty flame stabilizer and widening the ignition range are fulfilled; (4) the flame stabilizer on duty has the advantages of simple structure, long service life, reliable cooling scheme, autonomously controllable ignition position, good ignition performance, large working range of the stabilizer and the like, and is particularly suitable for afterburners under the working conditions of high temperature and high speed incoming flow.
Drawings
FIG. 1 is a schematic view of an on-duty flame holder of the present invention utilizing an air cooling configuration to match the ignition location;
FIG. 2 is a comparison graph of the front and rear total pressure distribution of the fillet at the joint of the outer wall inclined plate and the rear plate;
FIG. 3 is a comparison of flow field traces for different combinations of cooling hole angles;
FIG. 4 is a schematic diagram of the temperature distribution of the front and rear hot side walls of the airless cooling structure;
FIG. 5 is a schematic diagram of the temperature distribution of the front and rear hot side walls of the gas-filled cold structure.
Detailed Description
The invention provides an on-duty flame stabilizer using an air cooling structure to match an ignition position, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1: the embodiment provides a design method of an on-duty flame stabilizer using an air cooling structure to match an ignition position, which comprises the following steps:
step 1: designing specification parameters of the flame stabilizer main body 1, including the lengths of a front plate 101 and a rear plate 103 which form the flame stabilizer main body 1 and the distance between the front plate 101 and the rear plate 103, and determining an included angle theta between the inclined plate 102 and the front plate 101 or the rear plate 103;
step 2: setting an air cooling structure: the inclined plate 102 and the rear plate 103 are subjected to thermal protection in a gas film cooling mode, the arrangement modes of the first cooling holes 105 and the second cooling holes 106 are arranged in rows, the hole diameter and the hole distance of the cooling holes can be determined according to actual requirements, and the hole opening density of a local area is adjusted according to the temperature distribution condition of the hot side walls of the inclined plate 102 and the rear plate 103 during stable combustion;
and step 3: the opening angle of the first cooling hole 105 on the inclined plate 102 is an included angle alpha between the opening direction and the inclined plate, the opening angle of the second cooling hole 106 on the rear plate 103 is an included angle beta between the opening direction and the inclined plate, and the backflow area is controlled by utilizing different combinations of the opening directions of the first cooling hole 105 and the second cooling hole 106, so that the independent control of the optimal ignition position required by the afterburner is realized;
and 4, step 4: rounding 104 is carried out at the joint of the cold air side wall surface inclined plate 102 and the rear plate 103;
and 5: selecting the centrifugal nozzle 3 according to actual requirements such as oil supply quantity, atomization angle and the like of the afterburner on-duty ignition, selecting the igniter 4 according to the actual ignition energy requirement, and respectively determining the positions of the centrifugal nozzle 3 and the igniter 4 according to a flow field structure controlled by the air cooling structure and the matched ignition position.
Example 2: the structure of the flame stabilizer on duty designed according to the design method of embodiment 1 is shown in fig. 1, and comprises a flame stabilizer body 1, a centrifugal nozzle 3 and an igniter 4, wherein the flame stabilizer body 1 is divided into three parts, namely a front plate 101, an inclined plate 102 and a rear plate 103, a cavity 2 is formed below the structure consisting of the inclined plate 102 and the rear plate 103, and a fillet 104 is processed at the joint of the inclined plate 102 and the rear plate 103 on the cold air side wall surface, wherein the cold air side is the side wall facing the incoming flow, namely the direction of the X axis extension in fig. 1, which can also be called as the axial direction, and the direction from the front end to the rear end or from the front end to the rear end, and the Y axis direction in the drawing is the radial direction; the swash plate 102 is provided with a plurality of first cooling holes 105, and the back plate 103 is provided with a plurality of second cooling holes 106.
The front plate 101 and the rear plate 103 of the flame holder body 1 are parallel to each other and extend along the horizontal direction, the respective length L of the front plate 101 and the rear plate 103 and the distance H between the front plate and the rear plate can be selected according to actual needs, the inclination angle of the inclined plate 102 connecting the front plate 101 and the rear plate 103 can be specifically selected according to needs, and the inclined plate 102 extends upwards along the axial direction in an inclined manner.
The angle θ between the swash plate 102 and the front plate 101 or the rear plate 103 is preferably 60 °. The cavity 2 formed by the sloping plate 102 and the back plate 103 can form a low-speed backflow area in the main flow, the structure of the low-speed backflow area is basically not interfered by the flow velocity of the main flow of the inner culvert, the structure, the position and the size of the backflow area can be actively controlled by the hole opening directions of the sloping plate and the back plate cooling holes, and the optimal ignition position and the optimal ignition range are matched by a gas cooling structure, so that the design scheme can meet the requirements of an afterburner on different ignition positions under the condition of high-temperature and high-speed incoming flow, and the low-speed backflow area can ensure that the local part in the backflow area keeps higher oil-gas ratio under the lean oil state, thereby ensuring the wide ignition and stable working range of the flame stabilizer on duty.
When the flame stabilizer on duty burns stably, the high-temperature area is in the cavity 2, and is under the action of heat transfer and radiation, the high-temperature area on the wall surface of the stabilizer is positioned on the inclined plate 102 and the rear plate 103, so the key for determining the service life of the stabilizer lies in the heat protection of the area. The cooling air channel of the culvert is provided with a sudden shrinkage structure, flow separation is easy to occur at the sudden shrinkage part, high-temperature hot gas at the hot side flows back into the cold side through the cooling hole, the cooling effect is poor, and the stabilizer is easy to ablate, therefore, through analysis of the reason of flow separation, the fillet 104 treatment is carried out at the joint of the cold air side wall inclined plate 102 and the rear plate 103, which is a key technology of the invention, numerical simulation calculation is carried out in a binary square tube for verifying the inhibition effect of flow separation after fillet, and as shown in figure 2, effective prevention of flow separation is realized through special treatment of the fillet.
The opening angle of the first cooling holes 105 on the inclined plate 102 is an included angle alpha between the opening direction and the inclined plate, the opening angle of the second cooling holes 106 on the rear plate 103 is an included angle beta between the opening direction and the inclined plate, and when different alpha and beta combinations are adopted, the structures, positions and sizes of the backflow regions in the cavity 2 are different.
Application example 1: numerical simulation analysis was performed on the flame holder on duty of example 2, and the aperture ratios of the first cooling holes 105 and the second cooling holes 106 were selected to be 1.8%; the aperture of each of the first cooling hole and the second cooling hole is 1mm, the hole pitch P is 9.4mm, the row pitch S is 4.7mm, the centrifugal nozzle 3 is a pressure atomizing nozzle, and the igniter 4 is a local high-temperature heat source;
on the basis of determining the above parameters, the influence of different opening angles on the recirculation zone is shown in fig. 3, fig. 3 is a streamline schematic diagram when different cooling hole opening angles are adopted by an on-duty flame stabilizer using an air cooling structure to match an ignition position, in fig. 3(a), α is 30 °, β is 30 °, in fig. 3(b), α is 150 °, β is 150 °, and different recirculation zone structures are present in a concave cavity when different opening angles are combined, so that different flow field structures can be matched by using the characteristic, and the optimal ignition position is actively controlled to meet the requirements of different afterburner structures on the ignition position, thereby improving the universality of the on-duty flame stabilizer on different afterburner structures, and simultaneously ensuring the reliability of ignition and stable operation. According to the results of fig. 3(a), with this combination of opening angles, under this configuration: the oil injection position, namely the position of the centrifugal nozzle 3 is taken at the L/2 position of the axial center line of the rear plate 103, which is a better oil injection position and is beneficial to fuel atomization and mixing; the ignition position, i.e., the position of the igniter 4, taken on the axial center line and five thirds L (3/5L) from the front end of the rear plate 103 is the optimum ignition position and the ignition performance is the best.
On the basis of the above structure, the present embodiment is an application of the on-duty flame stabilizer using the air-cooling structure to match the ignition position in the present invention, and a research is performed in a binary square tube, and a structural schematic diagram of the on-duty flame stabilizer using the air-cooling structure to match the ignition position is shown in fig. 1; the structural schematic diagram of the flame stabilizer on duty without an air cooling structure is only different from the structural schematic diagram of the flame stabilizer on duty without the air cooling structure and is used as the comparison verification of the structure in the invention; in this embodiment, comparison is performed only by using a combination of opening angles α of 30 ° and β of 30 °, in which cooling holes in a local high-temperature region are appropriately encrypted, and a numerical simulation calculation is performed on the on-duty flame stabilizer of the present invention, which is adapted to an ignition position by an air-cooled structure, in a binary square tube model.
The distribution and contour of the temperature of the hot side walls of the front plate and the rear plate of the stabilizer without the air-cooling structure is shown in fig. 4, and the distribution and contour of the temperature of the hot side walls of the front plate and the rear plate of the stabilizer with the air-cooling structure is shown in fig. 5. It can be seen from fig. 4 and 5 that after cooling, the lowest wall temperature is reduced to 860K, the lowest temperature appears on the wall surface of the upper left corner area of the cavity of the stabilizer, i.e. the area where the inclined plate and the back plate are connected, because the lowest temperature is located at the corner of the cavity, the cold air flow sprayed from the air film hole on the back plate has low speed and long residence time, a low temperature area is formed, and the highest temperature of the wall surface at the rightmost end of the back plate of the stabilizer is controlled below 1020K, the cooling effect is obvious, the design target is reached, and therefore, the working life and reliability of the flame stabilizer on duty under the condition of high-temperature gas can be effectively improved by arranging the cooling holes on the inclined plate and the back plate.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. An on-duty flame stabilizer matched with an ignition position by using an air cooling structure is characterized by comprising a flame stabilizer main body (1), wherein the flame stabilizer main body (1) comprises a front plate (101) extending horizontally, an inclined plate (102) arranged at the rear end of the front plate (101) and extending obliquely upwards, and a rear plate (103) arranged at the rear end of the inclined plate (102) and extending horizontally; a concave cavity (2) is formed below the structure formed by the inclined plate (102) and the rear plate (103); the back plate (103) is provided with a centrifugal nozzle (3) and an igniter (4); rounding (104) at the joint of the sloping plate (102) and the rear plate (103) on the side wall surface of the cold air; a plurality of cooling holes are arranged on the flame stabilizer main body (1) and are used as air cooling structures; the air cooling structure comprises a plurality of first cooling holes (105) arranged on the inclined plate (102) and a plurality of second cooling holes (106) arranged on the rear plate (103); the arrangement modes of the plurality of first cooling holes (105) and the plurality of second cooling holes (106) are all in socket arrangement.
2. The on-duty flame holder for matching ignition position by using air cooling structure as claimed in claim 1, wherein the opening angle of the first cooling hole (105) on the tilted plate (102) is an angle between the opening direction of the first cooling hole (105) and the tilted plate
(ii) a The opening angle of the second cooling hole (106) on the rear plate (103) is the included angle between the opening direction of the second cooling hole (106) and the rear plate
(ii) a The angle
And angle of inclination
The same or different.
3. The on-duty flame holder for matching ignition position using air cooling structure as claimed in claim 1, wherein the inclined plate (102) is included at an angle θ of 60 ° with respect to the front of the front plate (101).
4. The on-duty flame holder for matching ignition position using air cooling structure according to claim 1, wherein the centrifugal nozzle (3) is a pressure atomizing nozzle and the igniter (4) is a high energy igniter.
5. A design method of an on-duty flame stabilizer using an air cooling structure to match an ignition position is characterized by comprising the following steps:
(a) designing specification parameters of a flame stabilizer main body (1), wherein the specification parameters comprise the lengths of a front plate (101) and a rear plate (103) which form the flame stabilizer main body (1) and the distance between the front plate and the rear plate, and determining an included angle theta between an inclined plate (102) and the front plate (101) or the rear plate (103);
(b) setting an air cooling structure: the inclined plate (102) and the rear plate (103) are subjected to thermal protection in a gas film cooling mode, the arrangement modes of the first cooling holes (105) and the second cooling holes (106) are arranged in rows, the hole diameter and the hole spacing of the cooling holes can be determined according to actual requirements, and the hole opening density of a local area is adjusted according to the temperature distribution conditions of the hot side walls of the inclined plate (102) and the rear plate (103) during stable combustion;
(c) the opening angle of the first cooling hole (105) on the inclined plate (102) is the included angle between the opening direction and the inclined plate
The opening angle of the second cooling hole (106) on the rear plate (103) is an included angle between the opening direction and the inclined plate
The opening directions of the first cooling hole (105) and the second cooling hole (106) are combined differently to control the backflow zone, so that the optimal ignition position required by the afterburner is controlled autonomously;
(d) rounding (104) at the joint of the cold air side wall surface inclined plate (102) and the rear plate (103);
(e) the method comprises the steps of selecting a centrifugal nozzle (3) according to actual requirements such as oil supply quantity and an atomization angle of on-duty ignition of an afterburner, selecting an igniter (4) according to the actual ignition energy requirement, and respectively determining the positions of the centrifugal nozzle (3) and the igniter (4) according to a flow field structure controlled by an air cooling structure and a matched ignition position.
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| CN2019110287227 | 2019-10-28 | ||
| CN201911028722 | 2019-10-28 |
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|---|---|---|---|---|
| CN113757723B (en) * | 2021-09-03 | 2022-10-21 | 南京航空航天大学 | Composite impact air film cooling wall type flame stabilizer and combustion chamber |
| CN113776082B (en) * | 2021-09-09 | 2023-01-06 | 南京航空航天大学 | Air-cooled wall type support plate combined flame stabilizer and combustion chamber |
| CN113864819B (en) * | 2021-09-14 | 2022-10-11 | 南京航空航天大学 | Afterburner with air cooling structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6735949B1 (en) * | 2002-06-11 | 2004-05-18 | General Electric Company | Gas turbine engine combustor can with trapped vortex cavity |
| CN101334174A (en) * | 2008-06-19 | 2008-12-31 | 北京航空航天大学 | V -type cone flame holder for rotor engine |
| CN102966974B (en) * | 2012-12-18 | 2015-01-21 | 中国人民解放军国防科学技术大学 | Supersonic combustor wall surface concave cavity structure and engine combustor comprising same |
| CN105823086B (en) * | 2016-03-25 | 2018-04-03 | 南京航空航天大学 | A kind of cyclone coupling spray nozzle |
| CN105953265B (en) * | 2016-05-27 | 2018-06-01 | 南京航空航天大学 | A kind of combined burning room |
| CN109539309A (en) * | 2018-11-08 | 2019-03-29 | 西北工业大学 | A kind of cavity standing vortex and rectification supporting plate combined integral after-burner |
| CN109780571B (en) * | 2018-12-26 | 2020-04-21 | 南京航空航天大学 | Evaporation type combined flame stabilizer |
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