CN105180204B - A kind of heat screen design method and heat screen - Google Patents
A kind of heat screen design method and heat screen Download PDFInfo
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- CN105180204B CN105180204B CN201510590450.5A CN201510590450A CN105180204B CN 105180204 B CN105180204 B CN 105180204B CN 201510590450 A CN201510590450 A CN 201510590450A CN 105180204 B CN105180204 B CN 105180204B
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- heat screen
- hole
- cooling hole
- heat
- burner
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Abstract
The present invention relates to aero-engine to force mixing after-burner field of structural design, and in particular to a kind of heat screen design method and heat screen, it is low to solve current heat screen cooling effectiveness, and then the problem of cause engine performance to decline.Heat screen is arranged on after-burner lobed mixer exit, and multigroup circumferentially distributed cooling hole is offered on heat screen, and heat screen design method includes the following steps：After-burner is modeled, including heat screen and lobed mixer；Heat screen surface temperature distribution is obtained by numerical computation method；According to heat screen surface temperature distribution situation, in same circumference, the percent opening of the cooling hole of temperature higher position is more than the percent opening of the cooling hole of temperature lower position；The heat screen of the present invention can save cooling gas flow, and then improve engine performance on the premise of cooling effect is ensured；Meanwhile, it is capable to reduce the circumferential thermal gradient of heat screen, life and reliability is improved.
Description
Technical field
The present invention relates to aero-engine to force mixing after-burner field of structural design, and in particular to a kind of heat screen
Design method and heat screen.
Background technology
Aeroengine thrust augmentation combustion chamber is typically up to more than 2000K as high-temperature component, its core flow temperature, it is necessary to right
Afterbunring chamber outer wall takes effective cooling provision to avoid ablation occurs, and ensures with enough reliabilities and uses the longevity
Life.Heat screen structure using longitudinal ripple thin plate is the type of cooling general at present, while circumferentially uniformly distributed in heat-insulated screen surfaces
Film cooling holes cool down it.
For forcing mixing after-burner, force mixer mixing is inside and outside to contain air-flow using wave-pieced type, but also make at the same time
Into mixer outlet gas flow temperature circumferentially on it is uneven, with the flowing backward of air-flow so that heat screen there is also
Circumferential non-uniform temperature, forms the temperature strip band at height interval.
With the generation of heat screen wall surface temperature skewness phenomenon, cooling gas flow can be caused to increase, reduced cold
But efficiency, and then cause engine performance to decline；Meanwhile the circumferential thermal gradient of heat screen is also add, reduce service life
And reliability.
The content of the invention
The object of the present invention is to provide a kind of heat screen design method and heat screen, to solve current heat screen cooling effectiveness
It is low, and then the problem of cause engine performance to decline.
The technical scheme is that：
A kind of heat screen design method, heat screen is arranged on the lobed mixer exit of after-burner, described heat-insulated
Multigroup circumferentially distributed cooling hole is offered on screen, the heat screen design method includes the following steps：
Step 1: the after-burner is modeled, including the heat screen and the lobed mixer；
Step 2: setting the boundary condition of the after-burner import, obtained by numerical computation method described heat-insulated
Screen surfaces Temperature Distribution；
Step 3: according to the heat screen surface temperature distribution come to cooling hole described in each group on the heat screen
Distribution is designed, wherein, in same circumference, it is relatively low that percent opening of the cooling hole at temperature higher position is more than temperature
Percent opening at position.
Preferably, the heat screen can be selected from following structure type：
Cylinder tablet, lateral wave card, longitudinal corrugated plate or laminate.
Preferably, the open-cellular form of the cooling hole can be selected from following structure type：
Washboard hole, inclined hole, flat hole or slot.
Preferably, the cross sectional shape of the cooling hole can be selected from following shape：
Rectangle, circle, trapezoidal or triangle.
Present invention also offers a kind of heat screen, is arranged on the lobed mixer exit of after-burner, described heat-insulated
Multigroup circumferentially distributed cooling hole is offered on screen, and the distribution of cooling hole described in each group is according to the heat screen table
Face Temperature Distribution is designed, wherein, in same circumference, percent opening of the cooling hole at temperature higher position is more than temperature
Spend the percent opening at lower position.
Preferably, the heat screen can be selected from following structure type：
Cylinder tablet, lateral wave card, longitudinal corrugated plate or laminate.
Preferably, the open-cellular form of the cooling hole can be selected from following structure type：
Washboard hole, inclined hole, flat hole or slot.
Preferably, the cross sectional shape of the cooling hole can be selected from following shape：
Rectangle, circle, trapezoidal or triangle.
Beneficial effects of the present invention：
The heat screen design method and heat screen of the present invention, is come on heat screen according to heat screen surface temperature distribution
The distribution of each group of cooling hole is designed, and in same circumference, the percent opening of the cooling hole of temperature higher position is more than temperature
The percent opening of the cooling hole of lower position, can save cooling gas flow, Jin Erti on the premise of cooling effect is ensured
High engine performance；Meanwhile, it is capable to reduce the circumferential thermal gradient of heat screen, life and reliability is improved.
Brief description of the drawings
Fig. 1 is the existing part-structure schematic diagram for forcing mixing after-burner；
Fig. 2 is the structure diagram of existing petal mixer；
Fig. 3 is the front view after existing heat screen expansion；
Fig. 4 is the bottom view after existing heat screen expansion；
Fig. 5 is the front view after the heat screen expansion of the present invention；
Fig. 6 is the bottom view after the heat screen expansion of the present invention.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.
As shown in Figures 1 to 4, it is existing to force mixing after-burner to include petal mixer 1, center cone 2, stabilizer
3rd, cylinder body outer wall 4 and heat screen 5.Wherein it is divided into intension petal 11 and outer culvert petal 12 on petal mixer structure；Intension is spent
Valve 11 and outer culvert petal 12 guide intension high temperature gas flow respectively and outer culvert low-temperature airflow is mixed, and subsequent oil jetting combustion produces can
The up to combustion product of 2000K.
Generally use heat screen 5 is thermally shielded cylinder body outer wall 4 protection, circulates between heat screen 5 and cylinder body outer wall 4 outer contain
Air-flow, while cooling hole 6 is provided with heat screen 5, cooling protection is carried out to heat screen 5 by gaseous film control mode.It is also, heat-insulated
The traditional distributions of cooling hole 6 are to be arranged circumferentially on screen 5.
The present invention provides a kind of heat screen design method, heat screen is arranged on the outlet of after-burner lobed mixer
Locate, multigroup circumferentially distributed cooling hole is offered on heat screen.Heat screen design method includes the following steps：
Step 1: being modeled to after-burner, modeling target includes heat screen and lobed mixer.Wherein, model
Foundation can use a variety of known softwares, such as UG softwares, details are not described herein again for specific modeling process.
Step 2: setting the boundary condition of after-burner import, heat-insulated screen surfaces temperature is obtained by numerical computation method
Degree distribution；Wherein, the boundary condition of after-burner import includes temperature, pressure and speed；Equally, numerical computations side is carried out
Method can also use a variety of known softwares, herein preferably Ansys softwares, and details are not described herein again for specific calculating process.
Step 3: set according to heat screen surface temperature distribution come the distribution to each group of cooling hole on heat screen
Meter, wherein, in same circumference, the percent opening of the cooling hole of temperature higher position is more than opening for the cooling hole of temperature lower position
Porosity；Enough cooling gas flow can be saved, and then improve engine performance on the premise of cooling effect is ensured；Meanwhile, it is capable to
The circumferential thermal gradient of heat screen is reduced, improves life and reliability.
The structure type of heat screen in heat screen design method of the present invention can carry out suitable selection, example as needed
Such as cylinder tablet, lateral wave card, longitudinal corrugated plate or laminate (two-ply).Equally, the perforate of the cooling hole on heat screen
Form can carry out suitable selection, such as washboard hole, inclined hole, flat hole or slot etc. as needed.Further, section of cooling hole
Face shape can selected as rectangle, circle, trapezoidal or triangle etc. as needed.
As shown in Figure 5 and Figure 6, present invention also offers it is a kind of designed according to above-mentioned heat screen design method it is heat-insulated
Screen, is arranged on after-burner lobed mixer exit；Multigroup circumferentially distributed cooling hole is offered on heat screen, and
The distribution of each group of cooling hole is designed according to heat screen surface temperature distribution, wherein, in same circumference, temperature is higher
The percent opening of the cooling hole of position is more than the percent opening of the cooling hole of temperature lower position；Heat screen can ensure cooling effect
On the premise of, cooling gas flow is saved, and then improve engine performance；Meanwhile, it is capable to reduce the circumferential thermal gradient of heat screen, carry
High life and reliability.
Equally, the structure type of heat screen can selected as cylinder tablet, lateral wave card, longitudinal corrugated plate as needed
Or laminate (two-ply) etc.；The open-cellular form of cooling hole on heat screen can be according to selected as washboard hole, inclined hole, flat hole or seam
Groove etc.；The cross sectional shape of cooling hole can selected as rectangle, circle, trapezoidal or triangle etc. as needed.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as
It is accurate.
Claims (8)
1. a kind of heat screen design method, heat screen is arranged on the lobed mixer exit of after-burner, the heat screen
On offer multigroup circumferentially distributed cooling hole, it is characterised in that the heat screen design method includes the following steps：
Step 1: be modeled to the after-burner, including the heat screen and the lobed mixer, it is described every
The structure type of heat shielding is corrugated board structures form；
Step 2: setting the boundary condition of the after-burner import, the heat screen table is obtained by numerical computation method
Face Temperature Distribution；
Step 3: according to the heat screen surface temperature distribution come the distribution to cooling hole described in each group on the heat screen
It is designed, wherein, in same circumference, percent opening of the cooling hole at temperature higher position is more than temperature lower position
The percent opening at place.
2. heat screen design method according to claim 1, it is characterised in that the heat screen can be selected from such as lower structure
Form：
Cylinder tablet, lateral wave card, longitudinal corrugated plate or laminate.
3. heat screen design method according to claim 2, it is characterised in that the open-cellular form of the cooling hole can select
Lower structure form freely：
Washboard hole, inclined hole, flat hole or slot.
4. heat screen design method according to claim 3, it is characterised in that the cross sectional shape of the cooling hole can select
From following shape：
Rectangle, circle, trapezoidal or triangle.
5. a kind of heat screen, is arranged on the lobed mixer exit of after-burner, it is characterised in that the knot of the heat screen
Configuration formula is corrugated plating, and the heat screen on offer multigroup circumferentially distributed cooling hole, it is and cold described in each group
But the distribution in hole is designed according to the heat screen surface temperature distribution, wherein, in same circumference, the cooling hole exists
Percent opening at temperature higher position is more than the percent opening at temperature lower position.
6. heat screen according to claim 5, it is characterised in that the heat screen can be selected from following structure type：
Cylinder tablet, lateral wave card, longitudinal corrugated plate or laminate.
7. heat screen according to claim 6, it is characterised in that the open-cellular form of the cooling hole can be selected from following knot
Configuration formula：
Washboard hole, inclined hole, flat hole or slot.
8. heat screen according to claim 7, it is characterised in that the cross sectional shape of the cooling hole can be selected from following shape
Shape：
Rectangle, circle, trapezoidal or triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510590450.5A CN105180204B (en) | 2015-09-17 | 2015-09-17 | A kind of heat screen design method and heat screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510590450.5A CN105180204B (en) | 2015-09-17 | 2015-09-17 | A kind of heat screen design method and heat screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105180204A CN105180204A (en) | 2015-12-23 |
| CN105180204B true CN105180204B (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510590450.5A Active CN105180204B (en) | 2015-09-17 | 2015-09-17 | A kind of heat screen design method and heat screen |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108317542B (en) * | 2018-01-03 | 2020-02-07 | 南方科技大学 | Cooling structure of aeroengine combustion chamber and aeroengine combustion chamber |
| CN109519284A (en) * | 2018-12-12 | 2019-03-26 | 北京动力机械研究所 | A kind of combustion chamber heat screen |
| CN110906365A (en) * | 2019-10-30 | 2020-03-24 | 北京动力机械研究所 | Light and uniformly cooled longitudinal corrugated heat shield |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203671657U (en) * | 2013-12-10 | 2014-06-25 | 中航商用航空发动机有限责任公司 | Flame tube and gas turbine combustion chamber comprising same |
| CN104019465A (en) * | 2014-05-29 | 2014-09-03 | 南京航空航天大学 | Turbine-based combined cycle engine super-combustion chamber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7506512B2 (en) * | 2005-06-07 | 2009-03-24 | Honeywell International Inc. | Advanced effusion cooling schemes for combustor domes |
| US7905094B2 (en) * | 2007-09-28 | 2011-03-15 | Honeywell International Inc. | Combustor systems with liners having improved cooling hole patterns |
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2015
- 2015-09-17 CN CN201510590450.5A patent/CN105180204B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203671657U (en) * | 2013-12-10 | 2014-06-25 | 中航商用航空发动机有限责任公司 | Flame tube and gas turbine combustion chamber comprising same |
| CN104019465A (en) * | 2014-05-29 | 2014-09-03 | 南京航空航天大学 | Turbine-based combined cycle engine super-combustion chamber |
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| CN105180204A (en) | 2015-12-23 |
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