CN114856715A - Boss and pit combined type blade air film cooling hole structure - Google Patents
Boss and pit combined type blade air film cooling hole structure Download PDFInfo
- Publication number
- CN114856715A CN114856715A CN202210511753.3A CN202210511753A CN114856715A CN 114856715 A CN114856715 A CN 114856715A CN 202210511753 A CN202210511753 A CN 202210511753A CN 114856715 A CN114856715 A CN 114856715A
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- Prior art keywords
- boss
- pit
- cylindrical hole
- film cooling
- edge surface
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- 238000001816 cooling Methods 0.000 title claims abstract description 70
- 230000007704 transition Effects 0.000 claims abstract description 7
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 19
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 19
- 239000007789 gas Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005068 transpiration Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/186—Film cooling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A boss and pit combined type blade air film cooling hole structure comprises a boss, a pit, a cylindrical hole and a wall surface; the boss, the pit and the cylindrical hole are all arranged in the wall surface, and the central lines of the boss, the pit and the cylindrical hole are positioned in the same plane; the cylindrical hole is communicated with the pit, and the orifice of the air outlet end of the cylindrical hole is positioned on the bottom surface of the pit; the boss is arranged in the pit, and the orifice of the air outlet end of the cylindrical hole is opposite to the boss; the height of the boss is the same as the depth of the pit; the boss is integrally crescent, and the orifice of the air outlet end of the cylindrical hole is opposite to the front edge surface of the boss; the section of the front edge surface of the boss is in a semi-ellipse shape, the section of the rear edge surface of the boss is in a semi-circle shape, and the joint transition surface of the front edge surface and the rear edge surface of the boss is a plane; the anterior segment surface cross-sectional shape of pit is semiellipse shape and links up mutually with the end drill way of giving vent to anger in cylinder hole, and the interlude surface cross-sectional shape of pit is the flaring shape, and the back end surface cross-sectional shape of pit is square. The invention can increase the transverse coverage of the cooling air film and inhibit the lifting of the cooling air flow.
Description
Technical Field
The invention belongs to the technical field of cooling of blades of gas turbines and aero-engines, and particularly relates to a boss and pit combined type blade air film cooling hole structure.
Background
In order to further improve the output power and the cycle efficiency of the gas turbine and the aircraft engine, the common practice is to continuously increase the turbine inlet temperature, however, the turbine inlet temperature of the gas turbine and the aircraft engine is far higher than the allowable temperature of the high-temperature component material, so that in order to ensure the operation safety and the economical efficiency of the high-temperature components of the gas turbine and the aircraft engine, an efficient cooling technology must be designed.
Existing cooling techniques include primarily transpiration cooling, impingement cooling, and film cooling. The film cooling is a cooling technology for isolating the wall surface of the hot end component from a high-temperature main flow by using a cooling film, cooling airflow flows out of cooling holes in the wall surface of the blade, and the cooling film is formed on the high-temperature wall surface, so that the high-temperature component is protected from being ablated by high-temperature gas. In addition, the film cooling efficiency is used as an important index for evaluating the film cooling performance, and the higher the film cooling efficiency is, the less the amount of cold air required under the same cooling condition can be ensured, so that the cold air consumption can be reduced, and the cold air can be mixed with the main flow to reduce the loss of turbine aerodynamics and thermal efficiency.
At present, the film cooling technology applied to gas turbines and aircraft engines still widely adopts cylindrical holes as cooling holes, and although the cylindrical holes have the characteristics of simple processing and easy engineering application, the cooling film covering area formed by the cylindrical holes is narrow, the span coverage is poor, and particularly under a high blowing ratio, the film can be separated from the wall surface, so that the film cooling efficiency is sharply reduced.
Therefore, in order to increase the coverage and cooling efficiency of the cooling air film, various cooling hole structures such as sister cooling holes, fan-shaped holes, slot holes, etc. have been proposed in the industry. However, these different cooling hole structures have a limited effect on the lateral (perpendicular to the flow direction) expansion of the cooling air film, and cannot effectively control the interaction between the main flow and the cooling flow, and also cannot effectively suppress the rise of the cooling air flow.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a boss and pit combined type blade air film cooling hole structure which can effectively increase the transverse coverage of a cooling air film and form effective air film cooling coverage and can effectively inhibit the lifting of cooling air flow.
In order to achieve the purpose, the invention adopts the following technical scheme: a boss and pit combined type blade air film cooling hole structure comprises a boss, a pit, a cylindrical hole and a wall surface; the boss, the pit and the cylindrical hole are all arranged in the wall surface; the cylindrical hole is communicated with the pit, and an air outlet end orifice of the cylindrical hole is positioned on the bottom surface of the pit; the boss is arranged in the concave pit, and the hole opening of the air outlet end of the cylindrical hole is opposite to the boss.
The center lines of the lug boss, the concave pit and the cylindrical hole are positioned in the same plane.
The height of the boss is the same as the depth of the pit.
The boss is integrally crescent, and the air outlet end orifice of the cylindrical hole is opposite to the front edge surface of the boss.
The cross section of the front edge surface of the boss is semi-elliptical, the cross section of the rear edge surface of the boss is semi-circular, and the joint transition surface of the front edge surface and the rear edge surface of the boss is a plane.
The front section surface cross-sectional shape of the pit is semi-elliptical and is connected with the air outlet end orifice of the cylindrical hole, the middle section surface cross-sectional shape of the pit is gradually enlarged, and the rear section surface cross-sectional shape of the pit is square.
The ratio of the diameter to the length of the cylindrical hole is 1 (1-10).
The included angle between the central line of the cylindrical hole and the main flow direction is 10-40 degrees.
The invention has the beneficial effects that:
the boss and pit combined type blade air film cooling hole structure can effectively increase the transverse coverage range of the cooling air film and form effective air film cooling coverage, and can effectively inhibit the lifting of cooling air flow.
Drawings
FIG. 1 is a perspective view of a boss and dimple combination bucket film cooling hole configuration of the present invention;
FIG. 2 is a top view of a combined boss and pocket bucket film cooling hole configuration of the present invention;
FIG. 3 is a side cross-sectional view of a boss and pocket combined bucket film cooling hole configuration of the present invention;
in the figure, 1-boss, 2-pit, 3-cylindrical hole, 4-wall.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 3, a boss and pit combined type blade air film cooling hole structure comprises a boss 1, a pit 2, a cylindrical hole 3 and a wall surface 4; the boss 1, the pit 2 and the cylindrical hole 3 are all arranged in the wall surface 4; the cylindrical hole 3 is communicated with the pit 2, and an air outlet end orifice of the cylindrical hole 3 is positioned on the bottom surface of the pit 2; the boss 1 is arranged in the pit 2, and the air outlet end orifice of the cylindrical hole 3 is opposite to the boss 1.
The center lines of the boss 1, the concave pit 2 and the cylindrical hole 3 are positioned in the same plane.
The height of the boss 1 is the same as the depth of the recess 2.
The boss 1 is crescent in shape as a whole, and the air outlet end orifice of the cylindrical hole 3 is opposite to the front edge surface of the boss 1.
The cross section of the front edge surface of the boss 1 is semi-elliptical, the cross section of the rear edge surface of the boss 1 is semi-circular, and the joint transition surface of the front edge surface and the rear edge surface of the boss 1 is a plane.
The anterior segment surface cross-sectional shape of pit 2 is semiellipse shape and links up with the end drill way of giving vent to anger of cylinder hole 3 mutually, and the interlude surface cross-sectional shape of pit 2 is the flaring shape, and the back end surface cross-sectional shape of pit 2 is square.
The ratio of the diameter to the length of the cylindrical hole 3 is 1 (1-10).
The included angle between the central line of the cylindrical hole 3 and the main flow direction is 10-40 degrees.
As shown in fig. 2 and 3, P is the span-wise boundary width of the boss and pit combined type blade air film cooling hole structure, S is the vertical distance between the rear edge point of the air outlet end orifice of the cylindrical hole 3 and the front edge surface of the boss 1, M is the span-wise width of the pit 2, C is the vertical distance between the connection transition surface of the front edge surface and the rear edge surface of the boss 1 and the rear end surface of the pit 2, D is the vertical distance between the span-wise boundary of the rear section of the pit 2 and the span-wise boundary of the boss and pit combined type blade air film cooling hole structure, D is the diameter of the cylindrical hole 3, L is the length of the cylindrical hole 3, and H is the depth of the pit 2.
In the embodiment, the span-wise boundary width P of the boss and pit combined type blade air film cooling hole structure is 16 mm; the diameter D of the cylindrical hole 3 is 4 mm; the length L of the cylindrical hole 3 is 12 mm; the vertical distance S between the rear edge point of the vent hole of the cylindrical hole 3 and the front edge surface of the boss 1 is 0.5D, and S is 2 mm; the included angle between the central line of the cylindrical hole 3 and the main flow direction is 30 degrees; the semiellipse long semi-axis of the front edge surface of the boss 1 is 1.5D, and then the semiellipse long semi-axis is 6 mm; the semi-elliptic short half shaft on the front edge surface of the boss 1 is 4mm if D is the semi-elliptic short half shaft; the radius of the semicircle of the rear edge surface of the boss 1 is 0.875D, and then the semicircle is 3.5 mm; the span-wise width of the connecting transition surface of the front edge surface and the rear edge surface of the boss 1 is 0.125D, and then the span-wise width is 0.5 mm; the vertical distance C between the connection transition surface of the front edge surface and the back edge surface of the boss 1 and the back end surface of the pit 2 is 0.5D, and then C is 2 mm; the depth H of the pit 2 is 1.5D, and then H is 6 mm; the spanwise width M of the pit 2 is 3.5D, and then M is 14 mm; the vertical distance D between the spanwise boundary of the rear section of the pit 2 and the spanwise boundary of the boss and pit combined type blade air film cooling hole structure is 0.25D, and then D is 1 mm.
When only the boss 1 is arranged, although the spanwise coverage of the air film is also improved, the spanwise cooling efficiency is not effectively improved in the middle area of the cylindrical hole 3 and the boss 1; when only the dimples 2 are provided, the film cooling efficiency is good inside the dimples 2, but the film cooling efficiency is not good in the spanwise direction outside the dimples 2. Therefore, when the boss 1 is combined with the pit 2, the lifting of the cooling air flow is effectively inhibited, and the spanwise coverage of the cooling air film is effectively increased. In addition, the pit 2 of 3 gas outlet end orifices departments in cylinder hole can make the cooling stream take place the secondary expansion, reduces the momentum of cooling stream, and boss 1 can shunt the cooling stream to both sides simultaneously, and then can produce favorable swirl, further suppresses the lifting of cooling gas film, compares with traditional cooling technology, under the same condition of cooling stream flow, can play the cooling effect to the wall of bigger tracts of land.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides a boss and pit combination formula blade air film cooling hole structure which characterized in that: comprises a boss, a pit, a cylindrical hole and a wall surface; the boss, the pit and the cylindrical hole are all arranged in the wall surface; the cylindrical hole is communicated with the pit, and an air outlet end orifice of the cylindrical hole is positioned on the bottom surface of the pit; the boss is arranged in the concave pit, and the hole opening of the air outlet end of the cylindrical hole is opposite to the boss.
2. The combined boss and pocket blade film cooling hole structure of claim 1, wherein: the center lines of the lug boss, the concave pit and the cylindrical hole are positioned in the same plane.
3. The combined boss and pocket blade film cooling hole structure of claim 1, wherein: the height of the boss is the same as the depth of the pit.
4. The combined boss and pocket blade film cooling hole structure of claim 1, wherein: the boss is integrally crescent, and the air outlet end orifice of the cylindrical hole is opposite to the front edge surface of the boss.
5. The combined boss and pocket blade film cooling hole structure of claim 4, wherein: the cross section of the front edge surface of the boss is semi-elliptical, the cross section of the rear edge surface of the boss is semi-circular, and the joint transition surface of the front edge surface and the rear edge surface of the boss is a plane.
6. The combined boss and pocket blade film cooling hole structure of claim 1, wherein: the front section surface cross-sectional shape of the pit is semi-elliptical and is connected with the air outlet end orifice of the cylindrical hole, the middle section surface cross-sectional shape of the pit is gradually enlarged, and the rear section surface cross-sectional shape of the pit is square.
7. The combined boss and pocket blade film cooling hole structure of claim 1, wherein: the ratio of the diameter to the length of the cylindrical hole is 1 (1-10).
8. The film cooling hole structure of combined boss and pit blade as claimed in claim 1, wherein: the included angle between the central line of the cylindrical hole and the main flow direction is 10-40 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210511753.3A CN114856715B (en) | 2022-05-12 | 2022-05-12 | Boss and pit combined type blade air film cooling hole structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210511753.3A CN114856715B (en) | 2022-05-12 | 2022-05-12 | Boss and pit combined type blade air film cooling hole structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114856715A true CN114856715A (en) | 2022-08-05 |
| CN114856715B CN114856715B (en) | 2024-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210511753.3A Active CN114856715B (en) | 2022-05-12 | 2022-05-12 | Boss and pit combined type blade air film cooling hole structure |
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| Country | Link |
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| CN (1) | CN114856715B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140964A (en) * | 2010-02-03 | 2011-08-03 | 中国科学院工程热物理研究所 | Structure for improving cooling efficiency of gas film of discrete hole |
| EP2666964A2 (en) * | 2012-05-22 | 2013-11-27 | Honeywell International, Inc. | Gas turbine engine blades with cooling hole trenches |
| CN105298649A (en) * | 2015-11-20 | 2016-02-03 | 清华大学 | Gas film cooling hole structure used for thin-walled hot end part of gas turbine engine |
| CN205225342U (en) * | 2015-12-24 | 2016-05-11 | 河北工业大学 | Improve upper reaches structure of subassembly external cooling effect |
| CN207245863U (en) * | 2017-08-30 | 2018-04-17 | 河北工业大学 | A kind of new construction for improving cooling effect |
| CN112031877A (en) * | 2020-08-21 | 2020-12-04 | 天津理工大学 | Expanding-direction asymmetric pit air film cooling hole pattern |
| CN112282857A (en) * | 2020-10-26 | 2021-01-29 | 上海交通大学 | Air film cooling hole type structure |
| CN213478402U (en) * | 2020-10-12 | 2021-06-18 | 青岛科技大学 | Novel slotting structure for improving cooling efficiency of turbine blade air film |
-
2022
- 2022-05-12 CN CN202210511753.3A patent/CN114856715B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140964A (en) * | 2010-02-03 | 2011-08-03 | 中国科学院工程热物理研究所 | Structure for improving cooling efficiency of gas film of discrete hole |
| EP2666964A2 (en) * | 2012-05-22 | 2013-11-27 | Honeywell International, Inc. | Gas turbine engine blades with cooling hole trenches |
| CN105298649A (en) * | 2015-11-20 | 2016-02-03 | 清华大学 | Gas film cooling hole structure used for thin-walled hot end part of gas turbine engine |
| CN205225342U (en) * | 2015-12-24 | 2016-05-11 | 河北工业大学 | Improve upper reaches structure of subassembly external cooling effect |
| CN207245863U (en) * | 2017-08-30 | 2018-04-17 | 河北工业大学 | A kind of new construction for improving cooling effect |
| CN112031877A (en) * | 2020-08-21 | 2020-12-04 | 天津理工大学 | Expanding-direction asymmetric pit air film cooling hole pattern |
| CN213478402U (en) * | 2020-10-12 | 2021-06-18 | 青岛科技大学 | Novel slotting structure for improving cooling efficiency of turbine blade air film |
| CN112282857A (en) * | 2020-10-26 | 2021-01-29 | 上海交通大学 | Air film cooling hole type structure |
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| Publication number | Publication date |
|---|---|
| CN114856715B (en) | 2024-05-10 |
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