CN112065604B - Low-infrared characteristic spray pipe - Google Patents
Low-infrared characteristic spray pipe Download PDFInfo
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- CN112065604B CN112065604B CN202010895501.6A CN202010895501A CN112065604B CN 112065604 B CN112065604 B CN 112065604B CN 202010895501 A CN202010895501 A CN 202010895501A CN 112065604 B CN112065604 B CN 112065604B
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- 239000007921 spray Substances 0.000 title claims abstract description 50
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 14
- 230000008676 import Effects 0.000 claims abstract description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 17
- 238000005452 bending Methods 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
- F02K1/82—Jet pipe walls, e.g. liners
- F02K1/822—Heat insulating structures or liners, cooling arrangements, e.g. post combustion liners; Infrared radiation suppressors
- F02K1/825—Infrared radiation suppressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/06—Varying effective area of jet pipe or nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/06—Varying effective area of jet pipe or nozzle
- F02K1/15—Control or regulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The invention relates to a low-infrared characteristic spray pipe which comprises an inner culvert and an outer culvert, wherein an inner culvert body and an outlet are positioned in a culvert channel of the outer culvert, a channel between the outer culvert and the inner culvert is a culvert channel, a channel in the inner culvert is a culvert channel, and the longitudinal sections of the main body parts of the inner culvert and the outer culvert are circular, wherein: the culvert main part is exported to the culvert and is exported the rectangle export that the rectangle that changes through level and smooth circle makes the culvert export for having certain width-to-height ratio, and extending structure is installed to the exit end of culvert, and culvert runner fluid can promote extending structure, makes it stretch out, reduces the width of culvert runner to increase the fluid pressure in the culvert runner, force the partial flow inflow culvert of culvert import department, passively adjust the culvert way ratio of culvert and culvert. The invention adjusts the area of the flow cross section through the change of the bypass airflow pressure, and effectively solves the problem of abnormal change of the bypass ratio when the S bending moment type spray pipe with low infrared radiation characteristic is used.
Description
Technical Field
The invention relates to the field of structural design of aero-engines, in particular to a ceramic-based turbine rotor structure, and particularly relates to a low-infrared characteristic spray pipe.
Background
With the development of infrared characteristic technology, the demand of aircraft infrared stealth is gradually increased. The infrared radiation on the 3-5um wave band of the aircraft mainly comes from high-temperature components of the aircraft engine, wherein the infrared radiation of the high-temperature components accounts for more than 70%. For parts such as a turbine, an afterburner, a central cone and the like, due to special pneumatic and thermal environments, the cooling measures are difficult to adopt, so that the adoption of the S-shaped spray pipe for shielding the infrared radiation characteristics of high-temperature parts is a high-efficiency infrared inhibition measure. As shown in figure 1, after the S-shaped spray pipe is adopted, the high-temperature part (the left side of the inlet surface) of the cavity of the spray pipe is obviously shielded, and the detectable infrared radiation intensity in a backward small angle is obviously reduced.
In addition, the rectangular spray pipe can strengthen the vortex of the corner area of the spray pipe and strengthen the mixing of the tail jet flow, so that the infrared radiation of the tail jet flow is reduced, the infrared radiation characteristic of a high-temperature part in a small-angle range behind the tail can be reduced by the small rear-view area of the rectangular spray pipe, and the infrared inhibition effect can be further strengthened by replacing an axisymmetric spray pipe with the rectangular spray pipe. Fig. 2 shows a comparison of the rear view areas of the axisymmetric nozzle B and the rectangular nozzle C having the same area, and it can be seen that, after the rectangular nozzle is adopted, the rear view area is reduced to the cross area a in the figure, which is obviously smaller than that of the axisymmetric nozzle B, and effectively shields the high-temperature components at the upstream of the inlet of the nozzle. In addition, as can be seen from fig. 3, the rectangular nozzle forms a vortex structure in symmetrical distribution at the outlet, which enhances mixing of the tail jet flow, and reduces the infrared radiation intensity of the tail jet flow, wherein the reduction amplitude can reach more than 50%. As shown in FIG. 4, the high temperature tail flame length of the axisymmetric nozzle tail jet is D, whereas the high temperature tail flame length is reduced to E when a rectangular nozzle is used. As for the whole spray pipe, a rectangular spray pipe with the width-height ratio of more than 4 is adopted, and the infrared inhibition effect can reach more than 70%. In conclusion, the rectangular spray pipe can achieve remarkable infrared inhibition effect on high-temperature parts and tail jet flow.
Therefore, the infrared radiation characteristic of the spray pipe can be greatly reduced by adopting the circular-to-rectangular S-shaped bending moment spray pipe, and the method is an effective infrared inhibition technology.
However, for the rectangular spray pipe, the profile form of the rectangular spray pipe is different from the original axisymmetric spray pipe profile, the difference brings about the change of the flow characteristic inside the spray pipe, the original bypass ratio of the spray pipe is changed, the working characteristic of the spray pipe is seriously influenced, and the application prospect of the rectangular spray pipe is also restricted. Researches show that the bypass ratio of the rectangular spray pipe can be effectively adjusted by adopting the adjusting device. The variation of the bypass ratio of the nozzle of the present invention to the conventional axisymmetric nozzle as a function of the internal and external bypass pressure ratios is shown in fig. 5.
Disclosure of Invention
In order to solve the problem of change of the bypass ratio of the spray pipe caused by change of the flow area in the use process of the S-shaped bending moment spray pipe with low infrared radiation characteristics, the invention provides the spray pipe with the low infrared radiation characteristics, which is a self-adaptive elastic structure of a round-to-rectangular S-shaped bending spray pipe with the low infrared radiation characteristics, so as to control and adjust the size of the bypass ratio. The area of the flow cross section is adjusted through the change of the duct airflow pressure, and the problem of abnormal change of the duct ratio when the S bending moment-shaped spray pipe with the low infrared radiation characteristic is used is effectively solved.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a low infrared characteristic spray tube, includes culvert and culvert, culvert main part and exit all are arranged in the culvert way of culvert, and the runner between culvert and the culvert is the culvert runner, and the runner in the culvert is the culvert runner, and the longitudinal section of the main part of culvert and culvert is circular, wherein: the culvert main part is exported to the culvert and is exported the rectangle export that the rectangle that changes through level and smooth circle makes the culvert export for having certain width-to-height ratio, and extending structure is installed to the exit end of culvert, and culvert runner fluid can promote extending structure, makes it stretch out, reduces the width of culvert runner to increase the fluid pressure in the culvert runner, force the partial flow inflow culvert of culvert import department, passively adjust the culvert way ratio of culvert and culvert.
In order to optimize the structural form, the specific measures adopted further comprise:
the culvert body to the culvert outlet makes the culvert outlet be a rectangular outlet through smooth round-to-rectangle, and the width-height ratio of the culvert outlet is inversely proportional to the width-height ratio of the culvert outlet.
The culvert rear part is double S-shaped culvert and is formed by connecting S1 sections and S2 sections in a smooth transition mode, wherein the S1 section is bent upwards, the S2 section is bent downwards, the culvert outlet is positioned at the tail end of the S2 section, the culvert rear part is a single S-shaped culvert, the single S-shaped culvert of the culvert is positioned in the S1 section of the culvert, and the trend is adapted to the S1 section of the culvert.
The left end face, the right end face and the lower end face of the culvert outlet are provided with telescopic structures, wherein the telescopic structures arranged on the left end face and the right end face of the culvert outlet are single-channel elastic devices, the telescopic structures arranged on the lower end face of the culvert outlet are double-channel elastic devices, each single-channel elastic device consists of a first fixed seat and a first elastic sheet, the first fixed seats are fixed on the left end face or the right end face of the culvert outlet, the first elastic sheets are elastically and telescopically arranged on the first fixed seats, and the first elastic sheets can extend along the flowing direction of fluid in the culvert flow channel; the double-channel elastic device consists of a second fixing seat, a second elastic piece and a third elastic piece, the second fixing seat is fixed on the lower end face of the culvert outlet, the second elastic piece is elastically and telescopically installed on the second fixing seat, the third elastic piece is elastically and telescopically installed on the second elastic piece, and the second elastic piece and the third elastic piece can both extend along the flowing direction of fluid in the culvert flow channel.
The third elastic sheet is provided with a convex stress sheet for increasing the wind shielding surface.
The width-to-height ratio of the culvert outlet is 1/4, and the width-to-height ratio of the culvert outlet is 4.
The first fixed seat and the second fixed seat are equal in length, and the first elastic sheet, the second elastic sheet and the third elastic sheet are the same in size.
The invention has the following advantages:
1. installing a telescopic structure at the culvert outlet, and adjusting the actual flow area to meet the requirement of the culvert ratio of the original spray pipe; and according to the duct trend, the extending structure of terminal surface installation about the culvert export is single-channel resilient means, and the extending structure of the lower terminal surface installation of culvert export is double-channel resilient means to possess protruding atress piece, the lower terminal surface of culvert export can receive bigger fluid pressure, has more apparent flexible rate of change, the actual flow area of regulation that can be more sensitive satisfies the great regulation scope requirement of lower floor flow area change.
2. The inner culvert outlet and the outer culvert outlet are both circular-rotating rectangular spray pipes, and the width-to-height ratio of the inner culvert outlet and the outer culvert outlet is in inverse proportion, so that the inner parts of the spray pipe cavity are effectively shielded, and the infrared radiation characteristic of small-angle detection after the tail is reduced;
3. the culvert adopts a double-S-shaped bent spray pipe structure, so that the hot components of the spray pipe are largely shielded, and the detectable infrared radiation characteristic after the tail is reduced;
the culvert adopts a circular-to-rectangular single S-shaped bent flow channel, and the length of the channel is the same as that of the S1 section of the culvert; and the S2 profile flow channel of the culvert deflects downwards, the culvert flow channel deflects upwards, and the opposite bending directions further reduce the visual area of the high-temperature component of the culvert pipeline.
Drawings
FIG. 1 is a schematic structural diagram of an aircraft engine S-bend nozzle in the background art;
FIG. 2 is a comparison of the rear view areas of a medium area axisymmetric nozzle B and a rectangular nozzle C of the prior art;
FIG. 3 is a schematic diagram of a vortex structure formed at the outlet of a rectangular nozzle in the prior art;
FIG. 4 is a schematic diagram of a wake comparison between a rectangular nozzle and an axisymmetric nozzle in the prior art;
FIG. 5 is a schematic view showing the bypass ratio variation of the rectangular nozzle and the axisymmetric nozzle under different pressure ratios in the prior art; FIG. 6 is a schematic view of a low infrared signature nozzle configuration of the present invention;
FIG. 7 is a schematic view of a single-pass elastic device;
fig. 8 is a schematic structural view of a dual-channel elastic device.
Wherein the reference numerals are: the culvert comprises a culvert 1, a culvert runner 11, a culvert 2, a culvert runner 21, an S1 section 22, an S2 section 23, a section telescopic structure 3, a single-channel elastic device 4, a first fixed seat 41, a first elastic sheet 42, a double-channel elastic device 5, a second fixed seat 51, a second elastic sheet 52, a third elastic sheet 53 and a protrusion stress sheet 54.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The utility model provides a low infrared characteristic spray tube, including culvert 1 and culvert 2, culvert 1 main part and exit all are located culvert 2, and the runner between culvert 2 and the culvert 1 is the culvert runner, and the runner in culvert 1 is the culvert runner, and the longitudinal section of the main part of culvert 1 and culvert 2 is circular, wherein: the main part of the culvert 1 to the outlet of the culvert 1 are rotated to the rectangle through the smooth circle to enable the outlet of the culvert 1 to be the rectangular outlet with a certain width-to-height ratio, the telescopic structure 3 is installed at the outlet end of the culvert 1, the telescopic structure 3 can be pushed by the fluid of the culvert channel to extend out, the width of the culvert channel is reduced, thereby increasing the fluid pressure in the culvert channel, forcing the partial flow of the inlet of the culvert 2 to flow into the culvert, and passively adjusting the culvert ratio of the culvert 1 and the culvert 2.
In the embodiment, the main body of the culvert 2 to the outlet of the culvert 2 enable the outlet of the culvert 2 to be a rectangular outlet through smooth round-to-rectangle conversion, and the width-height ratio of the outlet of the culvert 2 is inversely proportional to the width-height ratio of the outlet of the culvert 1.
In the embodiment, the back of the culvert 2 is a double S-shaped culvert and is formed by connecting S1 sections and S2 sections in a smooth transition mode, wherein the S1 section is bent upwards, the S2 section is bent downwards, the outlet of the culvert 2 is positioned at the tail end of the S2 section, the back of the culvert 1 is a single S-shaped culvert, the single S-shaped culvert of the culvert 1 is positioned in the S1 section of the culvert 2, and the trend of the single S-shaped culvert is adapted to the S1 section of the culvert 2.
In the embodiment, the left end face, the right end face and the lower end face of the outlet of the culvert 1 are provided with the telescopic structures 3, wherein the telescopic structures 3 arranged on the left end face and the right end face of the outlet of the culvert 1 are single-channel elastic devices 4, the telescopic structures 3 arranged on the lower end face of the outlet of the culvert 1 are double-channel elastic devices 5, each single-channel elastic device 4 consists of a first fixed seat 41 and a first elastic sheet 42, the first fixed seat 41 is fixed on the left end face or the right end face of the outlet of the culvert 1, the first elastic sheets 42 are elastically and telescopically arranged on the first fixed seats 41, and the first elastic sheets 42 can extend along the flowing direction of fluid in the culvert flow channel; the double-channel elastic device 5 is composed of a second fixing seat 51, a second elastic sheet 52 and a third elastic sheet 53, the second fixing seat 51 is fixed on the lower end face of the culvert 1 outlet, the second elastic sheet 52 is elastically and telescopically arranged on the second fixing seat 51, the third elastic sheet 53 is elastically and telescopically arranged on the second elastic sheet 52, and the second elastic sheet 52 and the third elastic sheet 53 can both extend along the flowing direction of fluid in the culvert channel.
In the embodiment, the third elastic piece 53 is formed with a convex force-receiving piece 54 for increasing the wind-shielding surface.
In the example, the width to height ratio of the culvert 1 outlet is 1/4 and the width to height ratio of the culvert 2 outlet is 4.
In the embodiment, the lengths of the first fixing seat 41 and the second fixing seat 51 are equal, and the sizes of the first elastic piece 42, the second elastic piece 52 and the third elastic piece 53 are equal.
The method adopts a circular-to-rectangular spray pipe, the profile of the circular-to-rectangular spray pipe adopts a multi-S-bend structure, and the S-bend channel profile is utilized to shield the heat radiation of the upstream heat component at the inlet of the spray pipe, so that the infrared radiation characteristic of the high-temperature component in a small-angle range after the tail is obviously reduced compared with a straight-axis symmetric spray pipe and a rectangular spray pipe; and the rectangular outlet is adopted to strengthen the mixing of the tail jet flow and the outflow flow, shorten the length of a high-temperature core area of the tail jet flow and play a role in infrared inhibition of the tail jet flow.
In addition, in the process of changing the axisymmetric nozzle into the circular-to-rectangular mixed exhaust nozzle, if the sectional area of the nozzle is not optimally designed, the bypass ratio of the nozzle is inevitably changed obviously, so that the performance of the design point of the engine is greatly influenced.
The patent provides an innovative solution, the section profile of the exhaust culvert is designed into a circular-turning rectangular profile consistent with the S1 section of the spray pipe culvert, and the length of the section profile is determined to be the first S-shaped bend from the inlet to the culvert, namely the section profile is as long as the S1 section of the culvert, so that the flow change caused by the abnormal change of the profile of the spray pipe is reduced; in addition, according to the characteristic that the flow separation of the spray pipes at the S1 section of the culvert is severe, a rectangular outlet with a small width-to-height ratio is adopted at the outlet of the culvert 1 pipeline; through the change of the pipeline profile of the culvert 1, the area of the on-way flow cross section is maintained near the design value of the original spray pipe as much as possible.
During design, the flow area between the rectangular shape of the outlet of the culvert 1 and the curved wall surface of the spray pipe S is adjusted by improving the shape of the rectangular shape of the outlet of the culvert 1, meanwhile, different elastic adjusting sheets are arranged outside the outlet of the culvert 1 section, the single elastic adjusting sheet is adopted laterally and laterally, airflow of the culvert 2 flows through and applies pressure to the first fixed seat 41, and the first elastic sheet 42 is extruded to move forwards, so that the flow area is reduced, and a throttling effect is generated; due to the fact that the change range of the flow area is large, the two elastic adjusting pieces are adopted on the lower side, airflow of the culvert 2 flows through to apply pressure to the second fixed seat 51, the second elastic piece 52 and the third elastic piece 53 are extruded to move forwards, and the flow area is reduced to a greater extent; in addition, the top of the third elastic sheet 53 is provided with a convex stress sheet 54, and the wind shielding surface of the third elastic sheet 53 is increased, so that the second elastic sheet 52 and the third elastic sheet 53 can utilize more fluid kinetic energy, and the flow area of the culvert 2 is further reduced. The problem of non-uniformity of circumferential distribution of the flow of the rectangular spray pipe is solved.
Meanwhile, as the pressure of the upper stream and the lower stream of the culvert 2 is unchanged, the flow velocity of the culvert 2 is unchanged, and when the pressure of the culvert 2 is increased, the flow is increased, and the culvert ratio is increased. At the moment, the elastic adjusting sheets are stretched under the action of pressure, the flow area is reduced, the partial flow of the culvert 2 flows into the culvert 1, the culvert ratio is reduced, and therefore the effect of adjusting the culvert ratio is achieved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (7)
1. The utility model provides a low infrared characteristic spray tube, includes culvert (1) and culvert (2), culvert (1) main part and exit all be located the duct of culvert (2), the runner between culvert (2) and culvert (1) is the culvert runner, the runner in culvert (1) is the culvert runner, the normal direction tangent plane of the main part of culvert (1) and culvert (2) be circular, characterized by: the culvert (1) main part export to culvert (1) and change the rectangle through smooth circle and make culvert (1) export for having the rectangle export of a certain width-height ratio, the exit end of culvert (1) install extending structure (3), culvert runner fluid can promote extending structure (3), makes it stretch out, reduces the width of culvert runner to increase the fluid pressure in the culvert runner, force the partial flow inflow of culvert (2) import department to contain, adjust the culvert way ratio of culvert (1) and culvert (2) passively.
2. The low infrared signature nozzle of claim 1, wherein: the outer culvert (2) is characterized in that the outlet from the main body of the outer culvert (2) to the outlet of the outer culvert (2) is a rectangular outlet through smooth round-to-rectangular conversion, and the width-height ratio of the outlet of the outer culvert (2) is inversely proportional to the width-height ratio of the outlet of the inner culvert (1).
3. The low infrared signature nozzle of claim 2 wherein: outer culvert (2) rear portion be two S shape culvert, form by S1 section and S2 section smooth transition connection, wherein S1 section upwards buckles, S2 section is buckled downwards, outer culvert (2) export is located the last tail of S2 section, inner culvert (1) rear portion be single S shape culvert, the single S shape culvert of inner culvert (1) is located the S1 section of outer culvert (2), and moves towards and suits with the S1 section of outer culvert (2).
4. A low ir signature nozzle as claimed in claim 3 wherein: the left end face, the right end face and the lower end face of the outlet of the culvert (1) are provided with telescopic structures (3), wherein the telescopic structures (3) arranged on the left end face and the right end face of the outlet of the culvert (1) are single-channel elastic devices (4), the telescopic structures (3) arranged on the lower end face of the outlet of the culvert (1) are double-channel elastic devices (5), each single-channel elastic device (4) consists of a first fixing seat (41) and a first elastic sheet (42), the first fixing seats (41) are fixed on the left end face or the right end face of the outlet of the culvert (1), the first elastic sheets (42) are elastically and telescopically arranged on the first fixing seats (41), and the first elastic sheets (42) can extend along the flow direction of fluid in the runner of the culvert; the double-channel elastic device (5) is composed of a second fixing seat (51), a second elastic sheet (52) and a third elastic sheet (53), the second fixing seat (51) is fixed on the lower end face of an outlet of the culvert (1), the second elastic sheet (52) is elastically and telescopically arranged on the second fixing seat (51), the third elastic sheet (53) is elastically and telescopically arranged on the second elastic sheet (52), and the second elastic sheet (52) and the third elastic sheet (53) can extend along the flowing direction of fluid in the culvert flow channel.
5. The low infrared signature nozzle of claim 4 wherein: and a convex stress sheet (54) for increasing the wind shielding surface is formed on the third elastic sheet (53).
6. The low infrared signature nozzle of claim 5 wherein: the width-height ratio of the outlet of the culvert (1) is 1/4, and the width-height ratio of the outlet of the culvert (2) is 4.
7. The low infrared signature nozzle of claim 6, wherein: the lengths of the first fixing seat (41) and the second fixing seat (51) are equal, and the lengths of the first elastic sheet (42), the second elastic sheet (52) and the third elastic sheet (53) are equal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010895501.6A CN112065604B (en) | 2020-08-31 | 2020-08-31 | Low-infrared characteristic spray pipe |
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| CN202010895501.6A CN112065604B (en) | 2020-08-31 | 2020-08-31 | Low-infrared characteristic spray pipe |
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| CN112065604B true CN112065604B (en) | 2021-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114251188B (en) * | 2021-12-22 | 2023-04-07 | 北京航空航天大学 | Spray pipe structure based on adaptive variable cycle engine and operation method thereof |
| CN115559827A (en) * | 2022-10-25 | 2023-01-03 | 北京动力机械研究所 | Dual-mode spray pipe |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4064692A (en) * | 1975-06-02 | 1977-12-27 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Variable cycle gas turbine engines |
| US4018046A (en) * | 1975-07-17 | 1977-04-19 | Avco Corporation | Infrared radiation suppressor for gas turbine engine |
| US6055804A (en) * | 1997-07-23 | 2000-05-02 | Sikorsky Aircraft Corporation | Turning vane arrangement for IR suppressors |
| FR2900389B1 (en) * | 2006-04-28 | 2009-01-16 | Snecma Sa | PROPULSION GAS EXHAUST ASSEMBLY IN A CORRELATED AIRCRAFT AIRCRAFT |
| CN106014686A (en) * | 2016-05-30 | 2016-10-12 | 西北工业大学 | S-shaped spray pipe structure for turbofan engine |
| CN106438103A (en) * | 2016-05-30 | 2017-02-22 | 西北工业大学 | S-shaped bent shrinking-expanding spray pipe structure |
| CN109339975B (en) * | 2018-11-02 | 2020-09-22 | 中国航空工业集团公司西安飞机设计研究所 | Stealth exhaust pipe with adjustable conical cavity |
| CN110500199B (en) * | 2019-09-29 | 2020-07-21 | 北京动力机械研究所 | Two-dimensional spray pipe adjusting device with adjustable throat and outlet area |
| CN111577480A (en) * | 2020-05-26 | 2020-08-25 | 中国航发沈阳发动机研究所 | Low detectable integration spray tube suitable for self-adaptation engine |
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