CN111911962A - Novel flame tube wall surface cooling structure - Google Patents
Novel flame tube wall surface cooling structure Download PDFInfo
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- CN111911962A CN111911962A CN202010841898.0A CN202010841898A CN111911962A CN 111911962 A CN111911962 A CN 111911962A CN 202010841898 A CN202010841898 A CN 202010841898A CN 111911962 A CN111911962 A CN 111911962A
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- flame tube
- wall surface
- cooling
- gas
- inclined hole
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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
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a novel flame tube wall surface cooling structure, which is characterized in that a corrugated groove area is formed in the flame tube wall surface, the groove area is W-shaped, each side surface is provided with an inclined hole, and partial areas between the inclined holes on the two side surfaces of a corrugated middle area are communicated. When cooling gas enters the flame tube from the outer wall of the flame tube, the cooling gas can pass through the corrugated groove area to form primary impact cooling, then the cooling gas enters the flame tube from the inclined hole, the cooling gas passing through the inclined hole cools the wall surface through the heat convection in the wall surface before forming the gas film, and then the gas film blanket continuously covering the side wall surface in the flame tube is formed, so that high-temperature gas and the wall surface of the flame tube are isolated, wherein the cooling gas can also form heat exchange when entering the inclined hole communicated with the corrugated middle area, and the cooling effect is better. Compared with the traditional flame tube wall surface punching structure, the invention improves the cooling efficiency of the flame tube cooling structure by adopting multiple times of cooling, and is beneficial to prolonging the service life of the flame tube.
Description
Technical Field
The invention belongs to the field of combustion chambers of aero-engines, and particularly relates to a novel flame tube wall surface cooling structure.
Background
The gas temperature of the main combustion zone of the combustion chamber can reach 2400K, which is the highest temperature zone of the gas turbine, and the normal working temperature of the metal material of the wall of the flame tube at present does not exceed 1300K, and the material cannot work for a long time in a severe environment far exceeding the normal working temperature, so that the flame tube of the combustion chamber must be cooled to prevent the flame tube from being burnt out to reduce the service life of the combustion chamber, and further reduce the service life of an engine. In order to ensure that the combustion chamber has long enough service life and reliability, two solutions are generally adopted, one is to increase the allowable working temperature of the flame tube material, namely to select a high-temperature resistant material with better performance; secondly, strengthen the thermal protection of flame tube, adopt advanced cooling technology and cooling structure, carry out effectual thermal protection to the flame tube wall. Because the speed of developing new high-temperature resistant materials is far from meeting the requirements, people pay more and more attention to the research and development of the cooling structure form and the cooling technology of the advanced flame tube. Thus, air not used for combustion, approximately 60% of the total air flow, is gradually introduced into the liner. Approximately one third of this air is used to reduce the temperature of the combustion gases in the dilution zone before they enter the turbine, while the remainder of the air is used to cool the walls of the liner. The basic cooling methods for the gas turbine flame tube at present mainly include film cooling, divergent cooling, impingement divergent combined cooling, laminate cooling and the like. The flame tube cooling technology also faces two major difficulties with the continuous improvement of the performance of the aero-engine, one difficulty is that the air quantity required to directly participate in combustion is gradually increased with the improvement of the performance of the aero-engine; another difficulty is that the pressure ratio of the aircraft engine is also gradually increased, and the temperature of the air at the outlet of the compressor, i.e. the temperature of the air that can be used to cool the wall of the liner, is also gradually increased, so that the cooling capacity of the air at the inlet of the combustion chamber as a coolant is gradually decreased. Therefore, how to reduce the amount of cooling air used when the temperature of the cooling air is increased and effectively cool the combustor liner becomes a key technology which needs to be solved urgently.
The novel flame tube wall surface cooling structure is adopted, when cooling gas enters the flame tube from the outer wall of the flame tube, the cooling gas passes through the corrugated groove region, primary impact cooling is formed in the groove region firstly, then the cooling gas enters the flame tube from the inclined hole, the wall surface is cooled through convection heat exchange in the wall surface before the cooling gas passing through the inclined hole forms an air film, then an air film blanket continuously covering the wall surface at the hot side of the flame tube is formed, high-temperature gas is isolated from the wall surface of the flame tube, and heat exchange is also formed when the cooling gas enters the inclined hole communicated with the middle region of the corrugation, so that the cooling effect is better.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a novel flame tube wall surface cooling structure, which can effectively improve the cooling efficiency of the flame tube cooling structure, reduce the flow of cooling gas, form a layer of 'gas film blanket' on the wall surface at the hot side of the flame tube, isolate high-temperature gas from the flame tube wall surface, and facilitate the reduction of the thermal stress of the wall surface, prevent local overheating and prolong the service life of the flame tube through multiple heat exchange cooling.
Technical scheme
The invention aims to provide a novel flame tube wall surface cooling structure.
The technical scheme of the invention is as follows:
the utility model provides a novel flame tube wall cooling structure which characterized in that: the wall surface cooling structure consists of a flame tube wall surface, corrugated groove regions and cooling inclined holes, wherein 4-6 groups of corrugated groove regions are punched on the flame tube wall surface, each group of corrugated regions is formed by connecting 4W-shaped grooves, and inclined holes are punched on the side surface of each groove, and the number of the inclined holes is 10-15; the inclined hole between two connected side surfaces of the W-shaped groove is provided with an intersection area in the wall surface, and the outlets of the inclined holes between the two separated side surfaces are converged into an inverted 8-shaped outlet at the outlet of the wall surface of the flame tube.
The invention has the following beneficial effects:
the novel flame tube wall surface cooling structure has the advantages that the cooling air consumption is small, the cooling efficiency is high, when cooling air enters the flame tube from the outer wall of the flame tube, the cooling air can pass through the corrugated groove area, firstly, impact cooling is formed in the groove area once, then, the cooling air enters the flame tube from the inclined hole, the cooling air passing through the inclined hole cools the wall surface through the convection heat exchange in the wall surface before forming an air film, then, an air film blanket continuously covering the wall surface of the flame tube at the hot side is formed, so that high-temperature fuel gas and the flame tube wall surface are isolated, and the cooling air can also exchange heat when entering the inclined hole communicated with the corrugated middle area, so that the cooling effect is better. Through multiple heat exchange and cooling, the heat stress of the wall surface is reduced, local overheating is prevented, and the service life of the flame tube is prolonged.
Drawings
FIG. 1: a novel flame tube wall surface cooling structure schematic diagram;
FIG. 2: the top view of the corrugated groove area on the outer wall surface of the flame tube;
FIG. 3: a top view of a corrugated groove area on the inner wall surface of the flame tube;
FIG. 4: sectional view of holes in corrugated groove area of flame tube;
in the figure: 1-the outer wall surface of the flame tube, 2-the corrugated groove region, 3-the inclined hole, 4-the inner wall surface of the flame tube, 5-the inverted 8-shaped outlet, and 6-the intersection region of the cooling holes between two adjacent side surfaces.
Detailed Description
The invention will now be further described with reference to the accompanying drawings in which:
with reference to fig. 1 to 4, the present invention provides a schematic diagram of a novel flame tube wall cooling structure, which includes a flame tube outer wall surface (1), a corrugated groove region (2), an inclined hole (3), and a flame tube inner wall surface (4).
The specific process comprises the following steps: when cooling gas enters the flame tube from the outer wall (1) of the flame tube, the cooling gas can pass through the corrugated groove area (2), primary impact cooling is formed in the groove area firstly, then the cooling gas enters the flame tube from the inclined holes (3) in the groove area, the wall surface is cooled through convective heat exchange in the wall surface before a gas film is formed through the cooling gas of the inclined holes, then a gas film blanket continuously covering the side wall surface (4) in the flame tube is formed, so that high-temperature gas and the wall surface of the flame tube are isolated, wherein the cooling gas can also form heat exchange when entering the inclined holes (6) communicated with each other in the middle area of the corrugations and flowing out from the inverted 8-shaped outlet, and the cooling effect is better. Through multiple heat exchange and cooling, the heat stress of the wall surface is reduced, local overheating is prevented, and the service life of the flame tube is prolonged.
Claims (1)
1. The utility model provides a novel flame tube wall cooling structure which characterized in that: the wall surface cooling structure consists of a flame tube wall surface, corrugated groove regions and cooling inclined holes, wherein 4-8 groups of corrugated groove regions are punched on the flame tube wall surface, each group of corrugated regions is formed by connecting 4-6W-shaped grooves, and inclined holes are punched on the side surface of each groove, and the number of the inclined holes is 10-15; the inclined hole between two connected side surfaces of the W-shaped groove is provided with an intersection area in the wall surface, and the outlets of the inclined holes between the two separated side surfaces are converged into an inverted 8-shaped outlet at the outlet of the wall surface of the flame tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841898.0A CN111911962A (en) | 2020-08-18 | 2020-08-18 | Novel flame tube wall surface cooling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841898.0A CN111911962A (en) | 2020-08-18 | 2020-08-18 | Novel flame tube wall surface cooling structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111911962A true CN111911962A (en) | 2020-11-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010841898.0A Pending CN111911962A (en) | 2020-08-18 | 2020-08-18 | Novel flame tube wall surface cooling structure |
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| CN (1) | CN111911962A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204460286U (en) * | 2013-12-12 | 2015-07-08 | 斯奈克玛 | For the annular wall of turbine combustion chamber, for toroidal combustion chamber and the turbine of turbine |
| CN105222158A (en) * | 2014-06-30 | 2016-01-06 | 中航商用航空发动机有限责任公司 | Floating pad and combustion chamber flame drum |
| CN106996319A (en) * | 2016-01-25 | 2017-08-01 | 安萨尔多能源瑞士股份公司 | Stator heat shield piece, the combustion gas turbine with it and the method for cooling down it |
| CN108870445A (en) * | 2018-04-11 | 2018-11-23 | 西北工业大学 | A kind of flame combustion chamber tube wall surface using the Y shape effusion wall type of cooling |
| CN109340826A (en) * | 2018-09-25 | 2019-02-15 | 西北工业大学 | A kind of flame combustion chamber tube wall surface two-layer compound cooling structure |
-
2020
- 2020-08-18 CN CN202010841898.0A patent/CN111911962A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204460286U (en) * | 2013-12-12 | 2015-07-08 | 斯奈克玛 | For the annular wall of turbine combustion chamber, for toroidal combustion chamber and the turbine of turbine |
| CN105222158A (en) * | 2014-06-30 | 2016-01-06 | 中航商用航空发动机有限责任公司 | Floating pad and combustion chamber flame drum |
| CN106996319A (en) * | 2016-01-25 | 2017-08-01 | 安萨尔多能源瑞士股份公司 | Stator heat shield piece, the combustion gas turbine with it and the method for cooling down it |
| CN108870445A (en) * | 2018-04-11 | 2018-11-23 | 西北工业大学 | A kind of flame combustion chamber tube wall surface using the Y shape effusion wall type of cooling |
| CN109340826A (en) * | 2018-09-25 | 2019-02-15 | 西北工业大学 | A kind of flame combustion chamber tube wall surface two-layer compound cooling structure |
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Application publication date: 20201110 |