CN112240569B - Flame stabilizer - Google Patents
Flame stabilizer Download PDFInfo
- Publication number
- CN112240569B CN112240569B CN202011051016.7A CN202011051016A CN112240569B CN 112240569 B CN112240569 B CN 112240569B CN 202011051016 A CN202011051016 A CN 202011051016A CN 112240569 B CN112240569 B CN 112240569B
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- Prior art keywords
- windward
- rear end
- guide plate
- flame
- wall surface
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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
Abstract
The invention belongs to the technical field of an integrated design afterburner, and particularly relates to a flame stabilizer which comprises a windward wall surface, a rear end wall, a bottom end and a cooling structure, wherein the windward wall surface is connected with the rear end wall through a side wall; the front edge cooling channel is formed between the guide plate and the windward wall surface, the central cooling channel is formed between the guide plate and the partition plate, the rear end air cooling cavity is formed between the partition plate and the rear end wall, the oil spray rod is located in the rear end air cooling cavity, and the bottom ends of the front edge cooling channel, the central cooling channel and the rear end air cooling cavity are communicated with each other.
Description
Technical Field
The invention belongs to the technical field of an integrated design afterburner, and particularly relates to a flame stabilizer.
Background
In order to increase the thrust of the engine in a short period, an afterburning method is often used. Based on the mode, the integrated afterburner developed according to the ideas of reducing flow loss, shortening the length of the combustor, improving the working reliability and the like is an important direction for the development of the engine. Whether the flame stabilizer in the integrated afterburner can work normally under a high-temperature condition is an important factor influencing the stability of a modern engine, and how to ensure that the wall temperature of the flame stabilizer is within a range which can be borne by materials is an urgent problem to be solved.
The invention patent with the prior patent publication number of CN105650677A discloses a flame stabilizer with a novel cooling structure integrated design, which comprises a fuel oil guide pipe, a fuel oil injection hole, a partition plate and an outer shell, wherein the partition plate is positioned in the outer shell to divide the outer shell into a cold air cavity and an impingement cooling cavity, the fuel oil guide pipe is positioned in the cold air cavity, the fuel oil injection hole is formed in the outer surface of the outer shell, which is vertical to the partition plate, a plurality of impingement holes are formed in the partition plate, and a plurality of air film holes are formed in the outer surface of the outer shell, which is parallel to the partition plate. This patent is through the jump bit + after the gas film hole cooling in opposite directions, and the cooling gas that the gas film hole flows out forms the vortex group air film and attaches to the stabilizer outer wall, and the wall temperature drop can reach 300K, through controlling the wall temperature behind the flame holder, and then influences the wall temperature of whole flame holder. However, the cooling effect of the scheme on the windward side and the side wall part of the flame stabilizer still does not reach an ideal state, and the temperature difference of the wall surface is still large.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a flame stabilizer, which enables the wall surface temperature of the flame stabilizer to tend to be average by reasonably arranging the circulation paths of cooling air flow in the flame stabilizer.
The specific technical scheme of the invention is as follows:
a flame stabilizer comprises a windward wall surface, a rear end wall, a bottom end and a cooling structure, wherein the windward wall surface is connected with the rear end wall through a side wall, an oil spray rod which has the same extension direction as the windward wall surface is further arranged in the flame stabilizer, a flow outlet is formed in the rear end wall, the cooling structure is arranged in the flame stabilizer and comprises a guide plate and a partition plate, the guide plate and the partition plate are opposite to the incoming flow direction of cooling air, the guide plate comprises a windward cambered surface and a straight section, the windward cambered surface is smoothly connected with the straight section, and the windward cambered surface of the guide plate extends out of the windward wall surface; the flame stabilizer is divided into three parts by the guide plate and the partition plate, wherein a front edge cooling channel is formed between the guide plate and the windward wall surface, a central cooling channel is formed between the guide plate and the partition plate, a rear end cold air cavity is formed between the partition plate and the rear end wall, the oil spray rod is positioned in the rear end cold air cavity, and the bottom ends of the front edge cooling channel, the central cooling channel and the rear end cold air cavity are communicated with each other.
The guide plate is arranged in parallel to a ridge line of the windward wall surface.
Wherein the distance between the straight section of the guide plate and the ridge line is 10-30 mm.
Wherein, the length of the straight section is 0.6-0.8 times of the length of the ridge line, and the height of the highest point of the windward cambered surface exceeding the end part of the ridge line is 5-15 mm.
Wherein, an included angle is formed between the baffle plate and the guide plate but not intersected, and the central cooling channel continuously shrinks towards the bottom direction of the flame stabilizer.
Wherein, the baffle forms the contained angle with the guide plate and is 2-4.
Wherein the length of the partition board is 0.7-0.85 times of the length of the ridge line.
Wherein, the baffle is provided with a cooling hole penetrating through the thickness direction of the baffle.
The cooling holes are uniformly distributed on the partition plate, and the cooling holes are symmetrically distributed about the center line of the partition plate.
Advantageous effects
(1) The wall temperature of the flame holder is reduced. Through set up guide plate and baffle in flame holder, the flow path of rational arrangement cooling gas in flame holder for the cooling gas can effectively cool off flame holder, has reduced flame holder wall temperature, has avoided because faults such as ablation that the flame holder wall high temperature leads to have guaranteed that flame holder can stabilize normal work.
(2) The degree of unevenness in the wall temperature of the flame holder is reduced. The leading edge cold air channel formed by the guide plate arranged in the flame stabilizer and the windward side of the flame stabilizer enables the cooling air to carry out targeted cooling on the windward side with higher temperature in the flame stabilizer. The cooling holes arranged on the partition board can reasonably distribute the flow of cold air flowing through the wall surface of the flame stabilizer, so that the wall surface temperature of the flame stabilizer tends to be uniform, the thermal stress on the surface of the flame stabilizer is reduced, and the service life of the flame stabilizer is prolonged.
(3) The stable and efficient combustion of the rear tissue of the flame stabilizer is facilitated. The flow of the outflow of the flame stabilizer is controlled by changing the distribution of the outflow ports on the rear end wall of the flame stabilizer, so that stable and efficient combustion is organized behind the flame stabilizer.
Drawings
FIG. 1 is a schematic view of a prior art flame holder
FIG. 2 is a prior art wall temperature contour of a flame holder
FIG. 3 is a schematic view of the present invention
FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3
FIG. 5 is a side view of a baffle
FIG. 6 is a front view of a baffle
FIG. 7 is a schematic view of a separator plate
FIG. 8 is a wall temperature contour of the flame holder of the present invention
Wherein, 1 is the windward wall, 2 is the rear end wall, 3 is the spray lance, 4 is the bottom, 5 is the guide plate, 6 is the baffle, 21 is the outflowing port, 51 is the cambered surface that faces the wind, 52 is the straight section, 61 is the cooling hole.
Detailed Description
In the prior art, the flame holder is a hollow cylinder with an open top and a closed bottom as shown in fig. 1, and includes a windward wall surface 1, a rear end wall 2 and a bottom 4, the windward wall surface 1 is connected with the rear end wall 2 through a side wall, an oil injection rod 3 is further arranged in the flame holder and has the same extension direction as the windward wall surface, an outlet 21 is arranged on the rear end wall 2, and the open end of the flame holder is communicated with an external duct.
At this time, the wall temperature contour line of the flame stabilizer is shown in fig. 2, because the runner of the outer duct cooling gas expands suddenly when entering the flame stabilizer, a separation zone attached to the wall is formed inside the front edge of the outer duct cooling gas, the outer duct cold flow cannot effectively cool the windward side of the flame stabilizer, the windward side of the flame stabilizer is high in temperature, and the surface temperature difference is not ideal.
Therefore, on the basis of the prior art, as shown in fig. 3 and 4, a cooling structure is additionally arranged in the flame stabilizer, and comprises a guide plate 5 and a partition plate 6, the guide plate 5 and the partition plate 6 are both over against the incoming flow direction of cooling air, as shown in fig. 5 and 6, the guide plate 5 is a schematic diagram of the guide plate 5, the guide plate 5 comprises a windward arc surface 51 and a straight section 52, the windward arc surface 51 is smoothly connected with the straight section 52, the straight section 52 of the guide plate 5 and the partition plate 6 are both located within the windward wall surface 1, and the windward arc surface 51 of the guide plate 5 extends out of the windward wall surface 1; the flame stabilizer is divided into three parts by the guide plate 5 and the partition plate 6, wherein a front edge cooling channel is formed between the guide plate 5 and the windward wall surface 1, a central cooling channel is formed between the guide plate 5 and the partition plate 6, a rear end cold air cavity is formed between the partition plate 6 and the rear end wall 2, the oil spray rod 3 is positioned in the rear end cold air cavity, and the bottom ends of the front edge cooling channel, the central cooling channel and the rear end cold air cavity are communicated with each other.
Through setting up above-mentioned cooling structure, reduced flame holder wall temperature. Through set up guide plate and baffle in flame holder, the flow path of rational arrangement cooling gas in flame holder for the cooling gas can effectively cool off flame holder, has reduced flame holder wall temperature, has avoided because faults such as ablation that the flame holder wall high temperature leads to have guaranteed that flame holder can stabilize normal work.
It should be noted that the air deflector 5 may be arranged parallel to the ridge line 11 of the windward wall surface 1, or may be arranged at an angle, but it is preferred that the air deflector 5 is arranged parallel to the ridge line 11 of the windward wall surface 1, forming a parallel leading edge cooling channel. Therefore, the temperature of the windward side of the flame stabilizer tends to be uniform. The windward arc surface 51 may be, for example, an arc surface, or another curved surface, as long as the concave surface faces the incoming direction of the cooling wind, and can smoothly transition with the straight section 52 to guide the bypass cold flow to enter the leading edge cooling channel with a low flow resistance.
Specifically, the distance between the straight section 52 of the guide plate 5 and the ridge line 11 is 10-30mm, the length of the straight section 52 is 0.6-0.8 times of the length of the ridge line 11, and the height of the highest point of the windward arc surface 51 exceeding the end part of the ridge line 11 is 5-15 mm. Just because the windward arc 51 determines the flow of cooling air into the leading edge cooling channel, the distance between the straight section 52 and the ridge line 11 determines the width of the leading edge cooling channel, and the length of the straight section 52 determines the length of the leading edge cooling channel, when these three parameters are defined as such, the surface temperature uniformity of the windward wall surface 1 of the flame stabilizer.
It is obvious that the partition 6 can be arranged parallel to the baffle 5 or at an angle to the baffle 5, but preferably, the partition 6 forms an angle with the baffle 5 but does not intersect, and the central cooling channel is continuously converging towards the bottom end 4 of the flame holder. So set up, cooling air current mach number in the central cooling channel increases, the increase and the convective heat transfer of flame holder lateral wall face.
Specifically, the included angle formed by the partition plate 6 and the guide plate 5 is 2-4 degrees, and the length of the partition plate 6 is 0.7-0.85 times of the length of the ridge line 11.
Among them, as shown in fig. 7, the partition plate 6 is preferably provided with cooling holes 61 penetrating through the thickness direction thereof. The cooling holes arranged on the partition board can reasonably distribute the flow of cold air flowing through the wall surface of the flame stabilizer, so that the wall surface temperature of the flame stabilizer tends to be uniform, the thermal stress on the surface of the flame stabilizer is reduced, and the service life of the flame stabilizer is prolonged.
Specifically, the cooling holes 61 are uniformly distributed on the separator 6 and are symmetrical with respect to the center line of the separator 6.
Specifically, the diameter of the cooling hole 61 is 4 to 6 mm.
By reasonably arranging the size and distribution of the cooling holes 61, part of cooling air can enter the rear end cooling air cavity through the cooling holes 61 on the partition plate 6. The cooling gas cools the oil spray rod 3 through the circumfluence of the oil spray rod 3, thereby avoiding the coking and blockage problems caused by overhigh temperature of the oil spray rod 3.
As shown in FIG. 8, the temperature contour map of the present invention shows that compared with FIG. 2, the flame stabilizer of the present invention has lower temperature at the windward wall, smaller high temperature area and more even surface temperature distribution.
Claims (9)
1. A flame stabilizer is a hollow cylinder with an open top and a closed bottom, and comprises a windward wall surface (1), a rear end wall (2) and a bottom end (4), wherein the windward wall surface (1) and the rear end wall (2) both extend downwards from the top of the flame stabilizer to the bottom end (4), the windward wall surface (1) is connected with the rear end wall (2) through a side wall, the rear end wall (2) is provided with an outflow port (21), cooling air enters the flame stabilizer from the top of the flame stabilizer in the incoming flow direction flowing from the windward wall surface (1) to the rear end wall (2), an oil spray rod (3) which is the same as the flame stabilizer in the extending direction is further arranged in the flame stabilizer, the oil spray rod (3) is arranged in a space between the windward wall surface (1) and the rear end wall (2) and keeps a distance with the windward wall surface (1), and is characterized in that a cooling structure is further arranged between the windward wall surface (1) and the oil spray rod (3), the cooling structure comprises a guide plate (5) and a partition plate (6), the guide plate (5) and the partition plate (6) are opposite to the incoming flow direction of cooling air, the guide plate (5) comprises a windward cambered surface (51) and a straight section (52), the windward cambered surface (51) is smoothly connected with the straight section (52), and the windward cambered surface (51) of the guide plate (5) extends out of a windward wall surface (1); the flame stabilizer is divided into three parts by the guide plate (5) and the partition plate (6), wherein a front edge cooling channel is formed between the guide plate (5) and the windward wall surface (1), a central cooling channel is formed between the guide plate (5) and the partition plate (6), a rear end cold air cavity is formed between the partition plate (6) and the rear end wall (2), the oil spray rod (3) is located in the rear end cold air cavity, and the bottom ends of the front edge cooling channel, the central cooling channel and the rear end cold air cavity are communicated with each other.
2. Flame holder according to claim 1, characterized in that the deflector (5) is arranged parallel to the ridge (11) of the windward wall (1).
3. Flame holder according to claim 2, characterized in that the straight section (52) of the deflector (5) is at a distance of 10-30mm from the ridge line (11).
4. The flame holder of claim 2, wherein the length of the straight section (52) is 0.6-0.8 times the length of the ridge line (11), and the height of the highest point of the windward arc surface (51) beyond the end of the ridge line (11) is 5-15 mm.
5. Flame holder according to claim 1, characterized in that the baffle (6) forms an angle with the deflector (5) but does not intersect, the central cooling channel tapering towards the bottom end (4) of the flame holder.
6. Flame holder according to claim 5, characterized in that the baffle (6) forms an angle of 2-4 ° with the deflector (5).
7. Flame holder according to claim 5, characterized in that the length of the baffle (6) is 0.7-0.85 times the length of the ridge (11).
8. Flame holder according to claim 5, characterized in that the partition (6) is provided with cooling holes (61) through its thickness.
9. Flame holder according to claim 8, characterized in that the cooling holes (61) are evenly distributed over the partition (6), the cooling holes (61) being symmetrically distributed about the center line of the partition (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011051016.7A CN112240569B (en) | 2020-09-29 | 2020-09-29 | Flame stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011051016.7A CN112240569B (en) | 2020-09-29 | 2020-09-29 | Flame stabilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112240569A CN112240569A (en) | 2021-01-19 |
| CN112240569B true CN112240569B (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011051016.7A Active CN112240569B (en) | 2020-09-29 | 2020-09-29 | Flame stabilizer |
Country Status (1)
| Country | Link |
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| CN (1) | CN112240569B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877374B (en) * | 2022-04-21 | 2023-07-07 | 南京航空航天大学 | Integrated afterburner support plate and afterburner using same |
Citations (6)
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|---|---|---|---|---|
| CN102032072A (en) * | 2010-11-24 | 2011-04-27 | 南京航空航天大学 | Exhaust system for gaseous film cooling central cone of turbofan aircraft engine |
| CN104296160A (en) * | 2014-09-22 | 2015-01-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Flow guide bush of combustion chamber of combustion gas turbine and with cooling function |
| CN204513463U (en) * | 2015-02-15 | 2015-07-29 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of combustion chamber cover cap with impacting water conservancy diversion cooling tube |
| CN205717329U (en) * | 2016-02-26 | 2016-11-23 | 南京航空航天大学 | Flameholder with novel cooling structure integrated design |
| RU185201U1 (en) * | 2017-12-01 | 2018-11-26 | Публичное Акционерное Общество "Одк-Сатурн" | CONTINUOUS COMBUSTION CAMERA |
| CN111512089A (en) * | 2017-12-26 | 2020-08-07 | 三菱日立电力系统株式会社 | Solid fuel burner and flame stabilizer for solid fuel burner |
-
2020
- 2020-09-29 CN CN202011051016.7A patent/CN112240569B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032072A (en) * | 2010-11-24 | 2011-04-27 | 南京航空航天大学 | Exhaust system for gaseous film cooling central cone of turbofan aircraft engine |
| CN104296160A (en) * | 2014-09-22 | 2015-01-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Flow guide bush of combustion chamber of combustion gas turbine and with cooling function |
| CN204513463U (en) * | 2015-02-15 | 2015-07-29 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of combustion chamber cover cap with impacting water conservancy diversion cooling tube |
| CN205717329U (en) * | 2016-02-26 | 2016-11-23 | 南京航空航天大学 | Flameholder with novel cooling structure integrated design |
| RU185201U1 (en) * | 2017-12-01 | 2018-11-26 | Публичное Акционерное Общество "Одк-Сатурн" | CONTINUOUS COMBUSTION CAMERA |
| CN111512089A (en) * | 2017-12-26 | 2020-08-07 | 三菱日立电力系统株式会社 | Solid fuel burner and flame stabilizer for solid fuel burner |
Non-Patent Citations (1)
| Title |
|---|
| 高超声速技术(HyTech)计划;占云;《飞航导弹》;20030320(第03期);第43-49页 * |
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| Publication number | Publication date |
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| CN112240569A (en) | 2021-01-19 |
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