CN105180204A - Heat screen design method and heat screen - Google Patents
Heat screen design method and heat screen Download PDFInfo
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- CN105180204A CN105180204A CN201510590450.5A CN201510590450A CN105180204A CN 105180204 A CN105180204 A CN 105180204A CN 201510590450 A CN201510590450 A CN 201510590450A CN 105180204 A CN105180204 A CN 105180204A
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- heat screen
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Abstract
The invention relates to the field of structural design of forced-mixing stress application combustion chambers of an aircraft engine, in particular to a heat screen design method and a heat screen. The problems that at present, the cooling efficiency of a heat screen is low, and consequently, the performance of the engine is decreased are solved. The heat screen is arranged on an outlet of a stress application combustion chamber lobed mixer, and a plurality of sets of cooling holes distributed in the circumferential direction are formed in the heat screen; and the heat screen design method comprises the following steps that modeling of a stress application combustion chamber is carried out, wherein the heat screen and the lobed mixer are included; through a numerical value calculation method, the surface temperature distribution of the heat screen is obtained; according to the surface temperature distribution condition of the heat screen, in the same circumference, the aperture ratio of the cooling holes in the positions with the higher temperature is larger than that of the cooling holes in the positions with the lower temperature; and according to the heat screen, on the premise that the cooling effect is ensured, the cooling air flow is saved, and the performance of the engine is further improved; and meanwhile, the circumferential heat gradient of the heat screen can be reduced, the service life is prolonged, and the reliability is improved.
Description
Technical field
The present invention relates to aero-engine and force mixing after-burner field of structural design, be specifically related to a kind of heat screen method for designing and heat screen.
Background technology
Aeroengine thrust augmentation combustion chamber is as high-temperature component, and its core flow temperature, usually up to more than 2000K, must be taked effective cooling provision to avoid ablation occurs to afterbunring chamber outer wall, ensure to have enough reliabilities and service life.The heat screen structure adopting longitudinal ripple thin plate is the type of cooling general at present, cools at the circumferential uniform film cooling holes in heat screen surface to it simultaneously.
For forcing mixing after-burner, wave-pieced type is adopted to force blender to mix inside and outside culvert air-flow, but what also result in that mixer outlet gas flow temperature circumferentially goes up is uneven simultaneously, along with the flowing backward of air-flow, make heat screen also there is the non-uniform temperature of circumference, form the temperature band at height interval.
Along with the generation of heat screen wall surface temperature skewness phenomenon, cooling gas flow can be caused to increase, reduce cooling effectiveness, and then cause engine performance to decline; Meanwhile, also add the circumferential thermal gradient of heat screen, reduce service life and reliability.
Summary of the invention
The object of this invention is to provide a kind of heat screen method for designing and heat screen, low to solve current heat screen cooling effectiveness, and then the problem causing engine performance to decline.
Technical scheme of the present invention is:
A kind of heat screen method for designing, heat screen is arranged on the lobed mixer exit of after-burner, described heat screen offers the many groups of Cooling Holes circumferentially distributed, and described heat screen method for designing comprises the steps:
Step one, modeling is carried out to described after-burner, comprising described heat screen and described lobed mixer;
Step 2, the boundary condition of described after-burner import is set, obtains described heat screen surface temperature distribution by numerical computation method;
Step 3, according to described heat screen surface temperature distribution, the distribution that each on described heat screen organizes described Cooling Holes to be designed, wherein, in same circumference, described Cooling Holes is greater than the percent opening at temperature lower position place at the percent opening at temperature higher position place.
Preferably, described heat screen can be selected from following version:
Cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate.
Preferably, the open-cellular form of described Cooling Holes can be selected from following version:
Washboard hole, inclined hole, flat hole or slot.
Preferably, the cross sectional shape of described Cooling Holes can be selected from following shape:
Rectangle, circle, trapezoidal or triangle.
Present invention also offers a kind of heat screen, be arranged on the lobed mixer exit of after-burner, described heat screen offers the many groups of Cooling Holes circumferentially distributed, and each distribution organizing described Cooling Holes designs according to described heat screen surface temperature distribution, wherein, in same circumference, described Cooling Holes is greater than the percent opening at temperature lower position place at the percent opening at temperature higher position place.
Preferably, described heat screen can be selected from following version:
Cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate.
Preferably, the open-cellular form of described Cooling Holes can be selected from following version:
Washboard hole, inclined hole, flat hole or slot.
Preferably, the cross sectional shape of described Cooling Holes can be selected from following shape:
Rectangle, circle, trapezoidal or triangle.
Beneficial effect of the present invention:
Heat screen method for designing of the present invention and heat screen, design according to the distribution of heat screen surface temperature distribution to each the group Cooling Holes on heat screen, in same circumference, the percent opening of the Cooling Holes of temperature higher position is greater than the percent opening of the described Cooling Holes of temperature lower position, can under the prerequisite ensureing cooling effect, save cooling gas flow, and then improve engine performance; Meanwhile, the circumferential thermal gradient of heat screen can be reduced, improve life and reliability.
Accompanying drawing explanation
Fig. 1 is the existing part-structure schematic diagram forcing mixing after-burner;
Fig. 2 is the structural representation of existing petal blender;
Fig. 3 is the front view after existing heat screen launches;
Fig. 4 is the upward view after existing heat screen launches;
Fig. 5 is the front view after heat screen of the present invention launches;
Fig. 6 is the upward view after heat screen of the present invention launches.
Detailed description of the invention
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.
As shown in Figures 1 to 4, the existing mixing after-burner that forces comprises petal blender 1, center cone 2, stabilizer 3, cylinder body outer wall 4 and heat screen 5.Wherein petal mixer structure is divided into intension petal 11 and outer culvert petal 12; Intension petal 11 and outer culvert petal 12 guide intension high temperature gas flow respectively and outer culvert low-temperature airflow mixes, and oil jetting combustion generation subsequently can up to the combustion product of 2000K.
Usual employing heat screen 5 pairs of cylinder body outer walls 4 carry out thermal insulation protection, contain air-flow outside circulating between heat screen 5 and cylinder body outer wall 4, heat screen 5 have Cooling Holes 6 simultaneously, carry out cooling protection by gaseous film control mode to heat screen 5.Further, on heat screen 5, the traditional distributions of Cooling Holes 6 is that circumference is evenly arranged.
The invention provides a kind of heat screen method for designing, heat screen is arranged on after-burner lobed mixer exit, heat screen offers the many groups of Cooling Holes circumferentially distributed.Heat screen method for designing comprises the steps:
Step one, carry out modeling to after-burner, modeling target comprises heat screen and lobed mixer.Wherein, the foundation of model can adopt multiple known software, and such as UG software, concrete modeling process repeats no more herein.
Step 2, the boundary condition of after-burner import is set, obtains heat screen surface temperature distribution by numerical computation method; Wherein, the boundary condition of after-burner import comprises temperature, pressure and speed; Equally, carry out numerical computation method and also can adopt multiple known software, be preferably Ansys software herein, concrete computational process repeats no more herein.
Step 3, according to heat screen surface temperature distribution on heat screen each group Cooling Holes distribution design, wherein, in same circumference, the percent opening of the Cooling Holes of temperature higher position is greater than the percent opening of the Cooling Holes of temperature lower position; Enough under the prerequisite ensureing cooling effect, cooling gas flow can be saved, and then improve engine performance; Meanwhile, the circumferential thermal gradient of heat screen can be reduced, improve life and reliability.
The version of the heat screen in heat screen method for designing of the present invention can carry out the selection be applicable to as required, such as cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate (two-ply) etc.Equally, the open-cellular form of the Cooling Holes on heat screen can carry out the selection be applicable to as required, such as washboard hole, inclined hole, flat hole or slot etc.Further, the cross sectional shape of Cooling Holes can be chosen as rectangle, circle, trapezoidal or triangle etc. as required.
As shown in Figure 5 and Figure 6, present invention also offers a kind of heat screen obtained according to the design of above-mentioned heat screen method for designing, be arranged on after-burner lobed mixer exit; Heat screen offers the many groups of Cooling Holes circumferentially distributed, and the distribution of each group Cooling Holes designs according to heat screen surface temperature distribution, wherein, in same circumference, the percent opening of the Cooling Holes of temperature higher position is greater than the percent opening of the Cooling Holes of temperature lower position; Heat screen under the prerequisite ensureing cooling effect, can save cooling gas flow, and then improves engine performance; Meanwhile, the circumferential thermal gradient of heat screen can be reduced, improve life and reliability.
Equally, the version of heat screen can be chosen as cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate (two-ply) etc. as required; The open-cellular form of the Cooling Holes on heat screen can according to being chosen as washboard hole, inclined hole, flat hole or slot etc.; The cross sectional shape of Cooling Holes can be chosen as rectangle, circle, trapezoidal or triangle etc. as required.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. a heat screen method for designing, heat screen is arranged on the lobed mixer exit of after-burner, described heat screen offers the many groups of Cooling Holes circumferentially distributed, it is characterized in that, described heat screen method for designing comprises the steps:
Step one, modeling is carried out to described after-burner, comprising described heat screen and described lobed mixer;
Step 2, the boundary condition of described after-burner import is set, obtains described heat screen surface temperature distribution by numerical computation method;
Step 3, according to described heat screen surface temperature distribution, the distribution that each on described heat screen organizes described Cooling Holes to be designed, wherein, in same circumference, described Cooling Holes is greater than the percent opening at temperature lower position place at the percent opening at temperature higher position place.
2. heat screen method for designing according to claim 1, is characterized in that, described heat screen can be selected from following version:
Cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate.
3. heat screen method for designing according to claim 2, is characterized in that, the open-cellular form of described Cooling Holes can be selected from following version:
Washboard hole, inclined hole, flat hole or slot.
4. heat screen method for designing according to claim 3, is characterized in that, the cross sectional shape of described Cooling Holes can be selected from following shape:
Rectangle, circle, trapezoidal or triangle.
5. a heat screen, be arranged on the lobed mixer exit of after-burner, it is characterized in that, described heat screen offers the many groups of Cooling Holes circumferentially distributed, and each distribution organizing described Cooling Holes designs according to described heat screen surface temperature distribution, wherein, in same circumference, described Cooling Holes is greater than the percent opening at temperature lower position place at the percent opening at temperature higher position place.
6. heat screen according to claim 5, is characterized in that, described heat screen can be selected from following version:
Cylinder flat board, lateral wave card, longitudinal corrugated plate or laminate.
7. heat screen according to claim 6, is characterized in that, the open-cellular form of described Cooling Holes can be selected from following version:
Washboard hole, inclined hole, flat hole or slot.
8. heat screen according to claim 7, is characterized in that, the cross sectional shape of described Cooling Holes can be selected from following shape:
Rectangle, circle, trapezoidal or triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510590450.5A CN105180204B (en) | 2015-09-17 | 2015-09-17 | A kind of heat screen design method and heat screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510590450.5A CN105180204B (en) | 2015-09-17 | 2015-09-17 | A kind of heat screen design method and heat screen |
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| Publication Number | Publication Date |
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| CN105180204A true CN105180204A (en) | 2015-12-23 |
| CN105180204B CN105180204B (en) | 2018-04-13 |
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108317542A (en) * | 2018-01-03 | 2018-07-24 | 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060272335A1 (en) * | 2005-06-07 | 2006-12-07 | Honeywell International, Inc. | Advanced effusion cooling schemes for combustor domes |
| US20090084110A1 (en) * | 2007-09-28 | 2009-04-02 | Honeywell International, Inc. | Combustor systems with liners having improved cooling hole patterns |
| 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 |
-
2015
- 2015-09-17 CN CN201510590450.5A patent/CN105180204B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060272335A1 (en) * | 2005-06-07 | 2006-12-07 | Honeywell International, Inc. | Advanced effusion cooling schemes for combustor domes |
| US20090084110A1 (en) * | 2007-09-28 | 2009-04-02 | Honeywell International, Inc. | Combustor systems with liners having improved cooling hole patterns |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108317542A (en) * | 2018-01-03 | 2018-07-24 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105180204B (en) | 2018-04-13 |
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