CN112412655A - Multi-runner small-eccentric short-distance S-shaped bent spray pipe structure - Google Patents
Multi-runner small-eccentric short-distance S-shaped bent spray pipe structure Download PDFInfo
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- CN112412655A CN112412655A CN202011226900.XA CN202011226900A CN112412655A CN 112412655 A CN112412655 A CN 112412655A CN 202011226900 A CN202011226900 A CN 202011226900A CN 112412655 A CN112412655 A CN 112412655A
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- 239000007921 spray Substances 0.000 title claims abstract description 54
- 238000005192 partition Methods 0.000 claims abstract description 22
- 230000003044 adaptive effect Effects 0.000 claims abstract 2
- 241000251468 Actinopterygii Species 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Abstract
The invention provides a multi-channel small-eccentricity short-distance S-shaped bent spray pipe structure which comprises an S-shaped bent spray pipe and a partition plate assembly inside the spray pipe, wherein the partition plate assembly is installed inside the S-shaped bent spray pipe in an adaptive mode. When being applicable to compact unmanned aerial vehicle short distance back organism space, satisfy the stealthy demand that unmanned aerial vehicle radar and infrared characteristic signal restrain, provide the thinking for compact unmanned aerial vehicle stealthy design.
Description
Technical Field
The invention belongs to the field of stealth design of an aero-engine, and relates to a multi-runner small-eccentric short-distance S-shaped bent spray pipe structure for a compact rear engine body.
Background
Along with the continuous promotion of military demands, the fixed wing aircraft that small, light in weight, cost are low, convenient to use, stealthy nature are more and more become the development trend of present and future military unmanned aerial vehicle aircraft. The engine is used as an important characteristic signal source of the aircraft, particularly an electric large cavity formed by the backward direction of the engine (the backward direction of a low-pressure turbine blade of the engine), a high-temperature high-pressure working environment and jet flow formed by a nozzle, so that the radar and infrared characteristic signal suppression of the engine becomes an important guarantee for improving the viability and the penetration resistance of weaponry.
According to the electromagnetic scattering principle and the infrared radiation principle, the key of greatly reducing the radar scattering cross section and the infrared radiation intensity of an engine target is to adopt a shielding layout and a reasonable cooling/material application technology, and the traditional 3S bent spray pipe becomes the mainstream direction of the current internal engine backward radar and infrared stealth design due to the full shielding performance of the traditional 3S bent spray pipe in the large-range yaw and pitch angle range and the convenience of the design and implementation of comprehensive stealth measures. But the bent spray tube of traditional S is higher to the space size demand of organism behind the aircraft, and length is longer, weight is great, and the cost is comparatively expensive, and is relatively poor to the demand adaptability of the stealthy design of compact light unmanned aerial vehicle. Therefore, for the hidden design of the engine of the compact unmanned aerial vehicle, the requirement of the short-distance rear body length space is met, the shielding of a backward strong scattering source (low-pressure turbine blade) of the engine is realized, and the hidden design requirement of inhibiting radar and infrared characteristic signals is realized. However, according to the available data, no research contents for solving the problems exist in China at present.
Therefore, the design of the engine spray pipe is provided in the invention, and the engine spray pipe can be suitable for the short-distance rear body space of the compact unmanned aerial vehicle, and can meet the requirements of radar and infrared characteristic signal suppression of the unmanned aerial vehicle, and provide a thought for the backward stealth design of the compact unmanned aerial vehicle.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a multi-runner small-eccentric short-distance S-shaped bent spray pipe structure which is suitable for a short-distance rear body space of a compact unmanned aerial vehicle, meets the stealth requirement of radar and infrared characteristic signal suppression of the unmanned aerial vehicle, and provides an idea for stealth design of the compact unmanned aerial vehicle.
The technical scheme of the invention is as follows: the multi-runner small-eccentricity short-distance S-shaped bent spray pipe structure comprises an S-shaped bent spray pipe 1 and a partition plate assembly 2 inside the spray pipe, wherein the partition plate assembly 2 is installed inside the S-shaped bent spray pipe 1 in a matched mode;
the inner surface of the S-shaped bent spray pipe is in smooth transition from the inlet direction to the outlet direction, wherein the inlet section of the spray pipe is circular, and the outlet section of the spray pipe is in a flat fish mouth shape; the partition plate assembly comprises a plurality of partition plates, wherein two ends of the cross section of each partition plate along the X direction are provided with sharp wedge angles;
the length direction of the S-shaped spray pipe is the X direction, the height direction of the S-shaped spray pipe is the Y direction, and the width direction of the S-shaped spray pipe is the Z direction.
Further, when the azimuth angle of the clapboard assembly 2 along the XZ plane is within 6-90 degrees, the inlet of the S-shaped spray pipe is completely shielded;
an azimuth angle of 0 ° is defined along the X direction, and the rotation angle of the diaphragm assembly 2 in the XZ plane is the azimuth angle.
Furthermore, the length of the S-shaped bent spray pipe along the X direction is 1.5 m-1.8 m.
Furthermore, the eccentric distance between the central point of the inlet section and the central point of the outlet section of the spray pipe along the Y direction of the spray pipe is 0-0.15 m.
Furthermore, a plurality of partition plates are arranged in parallel.
Furthermore, the sharp wedge angle of the two ends of the clapboard is 10-20 degrees.
Further, the partition board is of a special-shaped structure along the X direction.
Furthermore, the surface of the partition plate is provided with the bulges, so that the air flow mixing of the inner culvert and the outer culvert is improved, and the air flow temperature is reduced.
The invention has the beneficial effects that:
1) the average radar scattering cross section of the nozzle structure is reduced by 52%, the maximum infrared radiation intensity is reduced by 55%, and the good radar and infrared stealth design requirements can be met.
2) The nozzle of the nozzle structure is divided into a plurality of large-width-to-height-ratio runners by a multi-runner structural form formed by a plurality of partition plates, the full shielding of the inlet of the nozzle can be realized within a range of +/-6-90 DEG (DEG) of a backward axial included angle in the airflow direction of the engine nozzle, and the comprehensive design of an engine cooling flow path and the application of stealth materials or structural composite materials is facilitated.
3) The length of the spray pipe structure in the X direction is shorter, and the spray pipe structure is more suitable for the design of the rear engine body spray pipe of the compact unmanned aerial vehicle.
4) The spray pipe structure realizes the S-shaped design under short distance, and the eccentric distance between the central point of the inlet of the spray pipe and the central point of the outlet of the spray pipe can be adjusted according to the requirements of the assembly heights of different unmanned aerial vehicle engines.
Drawings
FIG. 1 is a schematic view of a nozzle configuration;
FIG. 2 is a schematic XY plane view of the nozzle structure;
FIG. 3 is a schematic XZ plan view of the nozzle configuration;
FIG. 4 is a schematic view of the nozzle baffle showing the location and shape of the nozzle baffle structure;
FIG. 5 is a schematic view in plan of a nozzle baffle structure XZ showing the relative length of the baffle in the Y direction to the nozzle;
fig. 6 is a schematic cross-sectional view of the spacer XZ in a plane.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
the invention designs a multi-channel small-eccentric short-distance S-shaped spray pipe structure after fully considering the design requirements of a fixed wing aircraft engine radar and infrared stealth with small volume, light weight, low manufacturing cost, convenient use and good stealth. Compared with the traditional S-shaped spray pipe, the spray pipe disclosed by the invention is smaller in structural design difficulty, shorter in length, lower in space requirement and more beneficial to a short-period low-cost compact light unmanned aerial vehicle platform.
A multi-flow-channel small eccentric short S-bend nozzle structure of the present invention will be described in detail with reference to fig. 1 to 6.
As shown in fig. 1, the multi-channel small eccentric short S-bend nozzle structure of the present embodiment includes an S-bend nozzle 1 and a partition plate assembly 2 inside the nozzle, and the partition plate assembly 2 is adapted to be installed inside the S-bend nozzle 1. And the inner surface of the S-shaped spray pipe 1 is in smooth transition from the inlet direction to the outlet direction, so that the pneumatic stability of the exhaust of the engine is ensured. The S-shaped bent spray pipe reduces the length of the spray pipe for considering the application requirements of the compact and light unmanned aerial vehicle, and the length of the S-shaped bent spray pipe in the X direction is 1.5-1.8 m.
In this embodiment, the length direction of the S-bend nozzle is defined as X direction, the height direction of the S-bend nozzle is defined as Y direction, and the width direction of the S-bend nozzle is defined as Z direction.
With reference to fig. 2 and 3, according to the requirement of the assembly height of the engine and the aircraft of different compact light unmanned aerial vehicles, the center point 4 at the inlet and the center point 5 at the outlet of the S-bend nozzle 1 of the embodiment allow a certain eccentric distance L in the Y direction, and the eccentric distance L is 0m to 0.15m, so that the invention is suitable for the assembly height of the engine and the aircraft of different compact light unmanned aerial vehicles, and the application range of the nozzle structure in the invention is widened. The inlet section 12 of the S-shaped spray pipe 1 is circular, the outlet section 13 is flat and shaped like a fish mouth, and the outlet section 13 partially shields the inlet section 12, so that the nozzle shape is utilized to shield the internal components of the engine and the inlet section of the spray pipe, and the hidden performance of the engine after the engine is improved.
As shown in fig. 4, the baffle plate assembly 2 of the present embodiment includes 5 baffle plates 21,22,23,24,25, and in order to ensure the stability of the engine exhaust gas flow and the uniformity of the flow direction, each of the baffle plates in the present embodiment is arranged in parallel, and the two ends of the baffle plate have sharp wedge angles 31,32, which are 10 ° to 20 °, as shown in fig. 6, and fig. 6 is a schematic cross-sectional view of the plane XZ of the baffle plate, thereby reducing the aerodynamic loss and flow separation occurring when the baffle plate flows across the surfaces of the baffle plate.
As shown in fig. 5, the partition plate assembly 2 of the present embodiment includes 5 partition plates 21,22,23,24, and 25, which extend in the X direction from the inside of the engine nozzle to the position of the nozzle outlet cross-section 13, so as to ensure that the nozzle inlet is completely shielded in the azimuth angle range of ± ± 6 ° to 90 ° behind the engine, thereby achieving better radar and infrared stealth performance. In this embodiment, the azimuth angle of the partition assembly along the X direction is defined as 0 °, and the rotation angle of the partition assembly 2 in the XZ plane is the azimuth angle. Therefore, in the embodiment, when the rotation angle of the partition plate assembly 2 on the XZ plane is within 6-90 degrees, the full shielding at the inlet of the S-shaped spray pipe is realized.
In addition, the surface of the clapboard can be provided with bulges, thereby improving the mixing of the internal and external culvert gases in the exhaust of the engine, reducing the temperature of the exhaust gas flow and improving the infrared stealth performance.
Moreover, the surface of the partition board in the embodiment can adopt radar absorbing materials or infrared stealth materials, so that incident electromagnetic waves are absorbed when being irradiated to the surface of the partition board, and radar characteristic signals behind the engine are reduced; the infrared electromagnetic wave generated by the high-temperature solid wall surface in the backward jet pipe of the engine is reflected, so that the backward infrared characteristic signal of the engine is reduced.
The inside cooling flow path that can adopt of baffle in this embodiment for the engine is inside back to the cold air introduction baffle of spray tube entry cross-section 12 department, reduces the baffle temperature, thereby reduces the engine and to infrared radiation intensity, improves infrared stealthy performance.
The baffle in this embodiment can adopt structural combined material, not only realizes radar absorbing material or infrared stealthy material's characteristic signal inhibiting effect to its quality is light, intensity is high, more is suitable for behind the compact light unmanned aerial vehicle engine stealthy design in.
Claims (8)
1. The multi-runner small-eccentricity short-distance S-shaped bent spray pipe structure is characterized by comprising an S-shaped bent spray pipe (1) and a partition plate assembly (2) inside the spray pipe, wherein the partition plate assembly (2) is installed inside the S-shaped bent spray pipe (1) in an adaptive mode;
the inner surface of the wall surface of the S-shaped bent spray pipe is in smooth transition from the inlet direction to the outlet direction, wherein the inlet section (12) of the spray pipe is circular, and the outlet section (13) of the spray pipe is in a flat fish mouth shape; the clapboard assembly (2) comprises a plurality of clapboards, wherein two ends of the cross section of each clapboard along the X direction are provided with sharp wedge angles;
the length direction of the S-shaped spray pipe is the X direction, the height direction of the S-shaped spray pipe is the Y direction, and the width direction of the S-shaped spray pipe is the Z direction.
2. A nozzle structure according to claim 1, characterized in that full shielding at the inlet of the S-bend nozzle is achieved when the azimuth angle of the baffle assembly (2) along the XZ plane is within 6 ° to 90 °;
the azimuth angle of the clapboard assembly is defined to be 0 degrees along the X direction, and the rotation angle of the clapboard assembly (2) in the XZ plane is the azimuth angle.
3. The nozzle arrangement of claim 1, wherein the S-bend nozzle has a length in the X direction of 1.5m to 1.8 m.
4. The nozzle structure according to claim 1, wherein the eccentric distance between the center point of the inlet cross section and the center point of the outlet cross section of the nozzle in the Y direction of the nozzle is 0-0.15 m.
5. The nozzle arrangement of claim 1, wherein the plurality of baffles are arranged in parallel.
6. A nozzle arrangement according to claim 5, wherein the tapering angle at each end of the baffle is between 10 ° and 20 °.
7. The nozzle arrangement of claim 1, wherein the baffle plate is contoured in the X direction.
8. A nozzle structure according to claim 7, wherein the baffle surface is provided with protrusions to enhance the mixing of the air flow in the culvert and to reduce the temperature of the air flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011226900.XA CN112412655A (en) | 2020-11-05 | 2020-11-05 | Multi-runner small-eccentric short-distance S-shaped bent spray pipe structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011226900.XA CN112412655A (en) | 2020-11-05 | 2020-11-05 | Multi-runner small-eccentric short-distance S-shaped bent spray pipe structure |
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| CN112412655A true CN112412655A (en) | 2021-02-26 |
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| CN202011226900.XA Pending CN112412655A (en) | 2020-11-05 | 2020-11-05 | Multi-runner small-eccentric short-distance S-shaped bent spray pipe structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895636A (en) * | 2021-11-18 | 2022-01-07 | 北京机电工程研究所 | Embedded type invisible air inlet channel |
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2020
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Cited By (2)
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| CN113895636A (en) * | 2021-11-18 | 2022-01-07 | 北京机电工程研究所 | Embedded type invisible air inlet channel |
| CN113895636B (en) * | 2021-11-18 | 2024-01-05 | 北京机电工程研究所 | Buried type stealth air inlet channel |
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Application publication date: 20210226 |
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