CN112160846B - Self-air-entraining pneumatic thrust vectoring nozzle with S-shaped curved flow passage - Google Patents
Self-air-entraining pneumatic thrust vectoring nozzle with S-shaped curved flow passage Download PDFInfo
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- CN112160846B CN112160846B CN202010990083.9A CN202010990083A CN112160846B CN 112160846 B CN112160846 B CN 112160846B CN 202010990083 A CN202010990083 A CN 202010990083A CN 112160846 B CN112160846 B CN 112160846B
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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
- F02K1/28—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto using fluid jets to influence the jet flow
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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
- F02K1/002—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto with means to modify the direction of thrust vector
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Abstract
The invention provides a self-air-entraining pneumatic vectoring nozzle with an S-shaped flow passage, which comprises a transition section, the S-shaped section, a guide plate and a main nozzle, wherein the guide plate and the main nozzle are sequentially connected, and the guide plate and the main nozzle are arranged on the middle rear part of the S-shaped section, and the main nozzle is provided with an adjusting valve for adjusting the direction and the size of air flow. The pneumatic vectoring nozzle provided by the invention combines the S-shaped flow channel, high-temperature components such as turbine blades and a central cone in the engine are shielded through the S-shaped flow channel, the signal characteristics of the engine are effectively reduced, the stealth performance of the engine is improved, and the flow guide plate is arranged at the S-shaped section and is guided to form a branch flow, so that the effect of a secondary flow which needs to be drawn from a high-pressure component at the front end of the engine originally is replaced, the influence on the performance of the engine is reduced, and the problem of supply and demand contradiction of large performance loss caused by large air entraining amount of the pneumatic vectoring nozzle is solved.
Description
Technical Field
The invention relates to a gas turbine engine, in particular to a pneumatic thrust vectoring nozzle structure which is provided with an S-shaped flow passage and does not bleed air from a front end high-pressure component on an engine exhaust system.
Background
With the increasing demands of military fighters on maneuverability and stealth, the vector deflection capability and stealth performance of engine nozzle components are increasingly gaining importance. At present, engine spray pipe parts arranged on active fighters in all countries in the world generate thrust vectors in a mechanical structure deflection mode, and meanwhile, stealth measures such as cooling or stealth coating are adopted to improve stealth performance. In order to solve the above problems, many studies have been made in the pneumatic vectoring technique in countries around the world.
The pneumatic vector spray pipe is a gas turbine engine exhaust device which injects secondary flow into a spray pipe flow passage and deflects the main flow by utilizing the disturbance effect of the secondary flow on the main flow to generate a thrust vector.
The structure of a conventional pneumatic vector nozzle is shown in figure 1, a flow channel of a main nozzle (1) of the pneumatic vector nozzle is in a convergent-divergent nozzle form, the structure of the main nozzle (1) is completely fixed, secondary flow pipeline outlets (2a, 2b, 3c and 3d) are arranged at the throat position and the divergent section position of the nozzle, secondary flow required by pneumatic vector control is introduced from high-pressure components (such as an intermediate stage of a compressor, a fan outlet and the like) at the front end of an engine through a secondary flow pipeline (4), the secondary flow is injected into a main flow of the nozzle from the secondary flow pipeline outlet (2a or 2b) at the throat part of one side of the nozzle and the secondary flow outlet (3b or 3a) at the divergent section of the other side of the nozzle after flowing through related pipelines and valves, and the main flow deflects under the interference effect of the secondary flow to generate thrust vectors. However, the conventional pneumatic vectoring nozzle needs a large secondary flow, and under the condition that about 10% of flow needs to be extracted from a front-end high-pressure component, the influence of the overall performance of the engine is difficult to bear, which influences the practical engineering application of the pneumatic vectoring technology on the gas turbine engine.
Disclosure of Invention
In order to solve the problems, the invention provides the pneumatic vectoring nozzle which is provided with the S-shaped flow passage and adopts a self-air-entraining secondary flow scheme, so that the problem of secondary flow air entraining of the pneumatic vectoring nozzle is solved, and the high stealth capacity of the pneumatic vectoring nozzle is realized by combining the S-shaped flow passage.
The invention aims to provide a self-air-entraining pneumatic vectoring nozzle with an S-shaped flow passage, which comprises a transition section, the S-shaped section, a guide plate and a main nozzle, wherein the guide plate and the main nozzle are arranged on the middle rear part of the S-shaped section, and the guide plate and the main nozzle are sequentially connected, and the main nozzle is provided with an adjusting valve for adjusting the direction and the size of air flow.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped curved flow passage is also characterized in that the guide plates comprise an upper guide plate and a lower guide plate which are arranged on the upper side and the lower side of the S-shaped curved section.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped curved flow passage is also characterized in that an upper sub-flow passage is formed by the upper guide plate and the upper wall surface of the inner wall of the S-shaped curved section, and a lower sub-flow passage is formed by the lower guide plate and the lower wall surface of the inner wall of the S-shaped curved section.
The self-bleed pneumatic vectoring nozzle with the S-shaped flow passage is further characterized in that the main nozzle comprises an upper passage, a middle passage and a lower passage, the upper passage is communicated with the upper sub-flow passage, the lower passage is communicated with the lower sub-flow passage, and the upper passage and the lower passage are respectively communicated with the middle passage through an upper sub-flow injection inlet and a lower sub-flow injection inlet.
The self-bleed air pneumatic thrust vectoring nozzle with the S-shaped runner is further characterized in that the upper channel and the lower channel are respectively provided with a regulating valve, and the regulating valve comprises one selected from a two-way valve and a three-way valve.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped flow passage is also characterized in that when the regulating valve is a three-way valve, the last-time flow injection inlet is divided into an upper-throat secondary flow injection inlet and an upper-expansion-section secondary flow injection inlet, and the next-time flow injection inlet is divided into a lower-throat secondary flow injection inlet and a lower-expansion-section secondary flow injection inlet.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped flow passage is also characterized in that the included angles between the upper throat secondary flow inlet, the upper expansion section secondary flow inlet, the lower throat secondary flow inlet and the lower expansion section secondary flow inlet and the horizontal symmetry plane of the main nozzle are 30-60 degrees.
The self-bleed air pneumatic vectoring nozzle with the S-shaped flow passage is further characterized in that the guide plate is fixed on the wall surface of the casing of the S-shaped section through the bow-shaped frame and the bolt.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped flow passage is further characterized in that one side, away from the S-shaped section, of the main nozzle is provided with an expansion section, and the expansion section comprises one selected from a symmetrical pipeline and an asymmetrical pipeline.
The self-air-entraining pneumatic vectoring nozzle with the S-shaped flow passage is also characterized in that when the regulating valve is a two-way valve, the middle passage is divided into a first convergence section, an expansion section and a second convergence section which are sequentially connected, and the upper and lower secondary flow injection ports are arranged at the connection position of the first convergence section and the expansion section.
Compared with the prior art, the invention has the beneficial effects that:
1) the pneumatic vectoring nozzle provided by the invention combines the S-shaped flow channel, high-temperature components such as turbine blades and a central cone in the engine are shielded through the S-shaped flow channel, the signal characteristics of the engine are effectively reduced, the stealth performance of the engine is improved, and a flow guide plate is arranged at the S-shaped section to guide the flow to form a branch flow, so that the effect of a secondary flow which needs to be drawn from a high-pressure component at the front end of the engine originally is replaced, the influence on the performance of the engine is reduced, and the problem of supply-demand contradiction of large performance loss caused by large air-entraining quantity of the pneumatic vectoring nozzle is solved;
2) the secondary flow path of the pneumatic vectoring nozzle provided by the invention is obviously simplified, and the number of movable components in the pneumatic vectoring nozzle is reduced, so that the weight of the nozzle is reduced, and the structural reliability is improved;
3) the pneumatic vector spray pipe provided by the invention can realize pneumatic vector deflection of more than 10 degrees under the condition of not introducing air from a high-pressure component at the front end of an engine, and has engineering practicability.
Drawings
FIG. 1 is a schematic diagram of a pneumatic thrust vectoring nozzle configuration as provided in the prior art;
FIG. 2 is a schematic structural view of a self-bleed pneumatic thrust vectoring nozzle with an S-turn flowpath according to an embodiment of the present invention;
FIG. 3 is an enlarged view of the S-bend section and the main nozzle of the pneumatic thrust vectoring nozzle according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a main nozzle of an aerodynamic vectoring nozzle according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an asymmetric main nozzle structure of an aerodynamic vectoring nozzle according to an embodiment of the present invention;
FIG. 6 is a schematic view of the vectoring of the pneumatic thrust vectoring nozzle provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of an application of an aerodynamic vectoring nozzle of an embodiment of the present invention to a dual throat aerodynamic vectoring nozzle,
wherein, 1: a main nozzle; 2 a: an upper throat secondary flow pipeline outlet; 2 b: a lower throat secondary flow pipeline outlet; 3 a: an outlet of the secondary flow pipeline of the upper expansion section; 3 b: the outlet of the secondary flow pipeline of the lower expansion section; 4: a secondary flow line; 5: a transition section; 6: s, bending; 7 a: an upper deflector; 7 b: a lower deflector; 8: an arched frame; 9: a three-way regulating valve; 10 a: an upper throat secondary flow inlet; 10 b: a lower throat secondary flow inlet; 11 a: an upper expansion section secondary flow inlet; 11 b: a lower expansion section secondary flow inlet; 12: a two-way valve.
Detailed Description
In order to make the technical means, the original features, the achieved objects and the effects of the present invention easily understood, the following embodiments are specifically described with reference to the accompanying drawings.
In the description of the embodiments of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing and simplifying the description of the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 2, the self-bleed pneumatic vectoring nozzle with the S-bend passage provided by the invention comprises a transition section, the S-bend section, a guide plate arranged on the middle rear part of the S-bend section and a main nozzle which are sequentially connected, wherein the main nozzle is provided with an adjusting valve for adjusting the direction and the size of air flow. The guide plate comprises an upper guide plate and a lower guide plate which are arranged on the upper side and the lower side of the S-shaped bent section. The regulating valve is a movable component, and the rest parts are static parts.
The upper flow guide plate and the upper wall surface of the inner wall of the S-shaped bent section form an upper sub-flow channel, and the lower flow guide plate and the lower wall surface of the inner wall of the S-shaped bent section form a lower sub-flow channel. The main nozzle comprises an upper channel, a middle channel and a lower channel, the upper channel is communicated with the previous flow channel, the lower channel is communicated with the next flow channel, and the upper channel and the lower channel are respectively communicated with the middle channel through an upper flow injection port and a lower flow injection port. The S-shaped bent section is used as an inlet, the main spray pipe is used as an outlet, a circulating loop communicated in the spray pipe is formed, and the secondary flow which is originally required to be drawn from a front-end high-pressure component in the pneumatic vectoring spray pipe is replaced; the middle channel is a main channel, airflow expands, accelerates and applies work to the outside in the main channel to generate thrust, and vector thrust is generated when the main channel deflects.
In some embodiments of the present invention, as shown in fig. 3-4, the regulating valve is a three-way valve (9), the last-time flow inlet is divided into an upper-throat secondary flow inlet (10a) and an upper-divergent-section secondary flow inlet (11a), and the next-time flow inlet is divided into a lower-throat secondary flow inlet (10b) and a lower-divergent-section secondary flow inlet (11 b). The three-way valve (9) adjusts the flow direction and the flow quantity, so that the secondary flow is injected into the main flow again at a throat secondary flow injection port (10a or 10b) or an expansion section secondary flow injection port (11a or 11b) on the main pipe (1) to influence the main flow. In order to ensure the pneumatic effect of the secondary flow injection, the secondary flow should be injected into the main flow at a certain angle, and the injection is generally performed at an angle of 30-60 degrees.
In some embodiments of the invention, a plurality of brackets (8) are arranged between the upper guide plate (7a), the lower guide plate (7b) and the S-shaped bent section (6), the brackets (8) play a role in supporting a branch channel and connecting an inner layer casing and an outer layer casing, and the brackets (8) are respectively connected to the upper guide plate (7a), the lower guide plate (7b) and the S-shaped bent section (6) in a bolt connection or riveting mode. The number of the brackets (8) is determined according to the load and the deformation, and the requirements of structural load bearing and deformation control are met. The molded surfaces of the upper guide plate (7a) and the lower guide plate (7b) are equidistant offset surfaces of the wall surface of the S-shaped bent section (6), the offset distance depends on the required branch flow, and the value of the distance is usually 10-30 mm. The positions of the upper guide plate (7a) and the lower guide plate (7b) are usually 1/3-1/2 at the rear part of the S-shaped bent section (6) flow channel.
In some embodiments of the present invention, for the needs of integration of the stealth and the rear body, a main nozzle in an asymmetric convergent-divergent flow path form may be adopted, as shown in fig. 5, after an asymmetric flow path form is adopted, a shielding relationship may be formed for a specific detection angle, thereby improving stealth capability. When the regulating valve is a three-way valve, the working state regulating mode is as follows:
the three-way regulating valve (9) is used for controlling the flow quantity and the flow direction of the secondary flows on the upper side and the lower side, so that the working state of the spray pipe is regulated.
In a non-vector state, the three-way regulating valves (9) on the upper side and the lower side use the same valve position, so that secondary flows on the upper side and the lower side are injected into secondary flow injection inlets on the upper side and the lower side of the main spray pipe (1) at the same flow opening degree, the main flow is not deflected at the moment, and the pneumatic throat area of the spray pipe can be regulated within a certain range by the opening degree of the regulating valves.
In a vector state, the three-way regulating valves (9) on the upper side and the lower side are positioned at different valve positions, so that the flow and the position of the main flow injected by the secondary flows on the upper side and the lower side are different, as shown in fig. 7, when the secondary flows on the upper side and the lower side are mainly injected into the upper throat secondary flow inlet (10a) and the lower expansion section secondary flow inlet (11b), the main flow deflects upwards to generate vector thrust upwards obliquely; on the contrary, when the upper and lower secondary flows are injected mainly at the upper expanding section secondary flow inlet (11a) and the lower throat secondary flow inlet (10b), the main flow deflects downwards to generate a vector thrust downwards.
In some embodiments of the present invention, as shown in fig. 7, the regulating valve is a two-way valve (12), the middle channel of the main nozzle (1) is divided into a first convergent section, an expansion section and a second convergent section which are connected in sequence, and the upper and lower secondary flow inlets are arranged at the connection of the first convergent section and the expansion section. The upper and lower secondary flows formed by the upper guide plate (7a), the lower guide plate (7b) and the S-shaped bent section (6) flow through the main nozzle (1) and the two-way regulating valve (12) and are asymmetrically injected into the upper and lower secondary flow injection inlets of the main nozzle (1), so that the main flow can also deflect to generate a thrust vector. At this time, the secondary flow channel structure is further simplified because the double-throat aerodynamic vector nozzle only needs to inject the secondary flow at the first throat.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The self-air-entraining pneumatic vectoring nozzle with the S-shaped curved flow passage is characterized by comprising a transition section, the S-shaped curved section, a guide plate and a main nozzle, wherein the guide plate and the main nozzle are sequentially connected, and the guide plate and the main nozzle are arranged on the middle rear part of the S-shaped curved section;
the guide plate comprises an upper guide plate and a lower guide plate which are arranged on the upper side and the lower side of the S-shaped bent section;
the upper flow guide plate and the upper wall surface of the inner wall of the S-shaped bent section form an upper sub-flow channel, and the lower flow guide plate and the lower wall surface of the inner wall of the S-shaped bent section form a lower sub-flow channel;
the main nozzle comprises an upper channel, a middle channel and a lower channel, the upper channel is communicated with the upper secondary flow channel, the lower channel is communicated with the lower secondary flow channel, and the upper channel and the lower channel are respectively communicated with the middle channel through an upper secondary flow injection port and a lower secondary flow injection port;
and the upper channel and the lower channel are respectively provided with a regulating valve, and the regulating valve comprises one selected from a two-way valve and a three-way valve.
2. The self-bleed pneumatic vectoring nozzle of claim 1 wherein when said regulator valve is a three-way valve, said last-time flow inlet is divided into an upper-throat secondary flow inlet and an upper-divergent-section secondary flow inlet, and said next-time flow inlet is divided into a lower-throat secondary flow inlet and a lower-divergent-section secondary flow inlet.
3. The self-bleed pneumatic vectoring nozzle of claim 2 having an S-bend flowpath, wherein the upper throat secondary jet, the upper diverging section secondary jet, the lower throat secondary jet and the lower diverging section secondary jet are angled from 30-60 ° from the horizontal plane of symmetry of the primary nozzle.
4. The self-bleeding pneumatic thrust vectoring nozzle with an S-bend flow path of claim 1 wherein said deflector is secured to the casing wall of said S-bend section by means of an arch and bolts.
5. The self-bleed pneumatic vectoring nozzle of claim 1 having an S-turn flowpath, wherein the main nozzle is provided with an expansion section on a side thereof remote from the S-turn section, the expansion section comprising one selected from a symmetrical duct and an asymmetrical duct.
6. The self-bleed pneumatic vectoring nozzle of claim 1 wherein the regulator valve is a two-way valve, the intermediate passage is divided into a first convergent section, an divergent section and a second convergent section connected in series, and the upper and lower secondary flow inlets are provided at the junction of the first convergent section and the divergent section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010990083.9A CN112160846B (en) | 2020-09-18 | 2020-09-18 | Self-air-entraining pneumatic thrust vectoring nozzle with S-shaped curved flow passage |
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| CN202010990083.9A CN112160846B (en) | 2020-09-18 | 2020-09-18 | Self-air-entraining pneumatic thrust vectoring nozzle with S-shaped curved flow passage |
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| CN112160846B true CN112160846B (en) | 2022-02-01 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963268B (en) * | 2021-03-15 | 2022-01-04 | 南京航空航天大学 | Throat offset pneumatic vectoring nozzle of small-hole jet flow |
| CN114233511B (en) * | 2021-11-27 | 2023-07-21 | 西北工业大学 | Jet pipe with aircraft exhaust stealth vector grid |
| CN115585060B (en) * | 2022-08-30 | 2024-04-02 | 中国航发四川燃气涡轮研究院 | Secondary flow regulating mechanism of jet nozzle of multi-duct engine |
| CN115614179B (en) * | 2022-08-31 | 2024-04-05 | 中国航发四川燃气涡轮研究院 | Throat area adjusting mechanism |
| CN115653779A (en) * | 2022-10-13 | 2023-01-31 | 中国航发四川燃气涡轮研究院 | Multi-shaft pneumatic thrust vectoring nozzle and multi-shaft thrust adjusting method |
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| US6112512A (en) * | 1997-08-05 | 2000-09-05 | Lockheed Martin Corporation | Method and apparatus of pulsed injection for improved nozzle flow control |
| CN103899432A (en) * | 2014-03-31 | 2014-07-02 | 西北工业大学 | Improved pneumatic vectoring nozzle structure with function of injecting double secondary flow branches |
| CN103993982A (en) * | 2014-04-25 | 2014-08-20 | 西北工业大学 | Double-S-bend infrared stealth spray pipe structure capable of achieving multi-direction thrust vector control |
| CN104847529A (en) * | 2015-03-27 | 2015-08-19 | 南京航空航天大学 | Three-degree of freedom vectored thrust system based on novel air-operated vectoring thrust nozzle |
| CN105443268A (en) * | 2015-11-26 | 2016-03-30 | 南京航空航天大学 | Bypass type passive double-throat pneumatic vector spraying pipe with flow regulating function and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8240125B2 (en) * | 2007-07-26 | 2012-08-14 | The Boeing Company | Thrust vectoring system and method |
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| US6112512A (en) * | 1997-08-05 | 2000-09-05 | Lockheed Martin Corporation | Method and apparatus of pulsed injection for improved nozzle flow control |
| CN103899432A (en) * | 2014-03-31 | 2014-07-02 | 西北工业大学 | Improved pneumatic vectoring nozzle structure with function of injecting double secondary flow branches |
| CN103993982A (en) * | 2014-04-25 | 2014-08-20 | 西北工业大学 | Double-S-bend infrared stealth spray pipe structure capable of achieving multi-direction thrust vector control |
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