CN111487030A - Supersonic speed continuous variable Mach number nozzle based on center body - Google Patents
Supersonic speed continuous variable Mach number nozzle based on center body Download PDFInfo
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- CN111487030A CN111487030A CN202010497598.5A CN202010497598A CN111487030A CN 111487030 A CN111487030 A CN 111487030A CN 202010497598 A CN202010497598 A CN 202010497598A CN 111487030 A CN111487030 A CN 111487030A
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- 239000007921 spray Substances 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241001640558 Cotoneaster horizontalis Species 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
- Spray Control Apparatus (AREA)
Abstract
The invention discloses a supersonic speed continuous variable Mach number nozzle based on a center body. The spray pipe is a spray pipe box body, the upper surface of the spray pipe box body is a two-dimensional molded surface I, and the lower surface of the spray pipe box body is a symmetrical two-dimensional molded surface II; a central body is arranged on the central line of the box body, and the central body is symmetrical up and down; the left side and the right side of the central body are provided with sliding chutes, the left side and the right side of the nozzle box body are provided with correspondingly matched sliding rails, and the central body moves back and forth on the central line of the nozzle box body through the matching of the sliding chutes and the sliding rails; a movement control mechanism is arranged outside the spray pipe box body to control the movement position and the movement speed of the central body; the front end face and the rear end face of the spray pipe box body are provided with sealing surrounding belts. The nozzle adopts a sliding center body nozzle technology, can realize the change of the wind tunnel Mach number from 2.0 to 3.5 or from 3.5 to 2.0 within 3 seconds, can ensure that the high-speed wind tunnel has good flow field quality, and provides a reliable technical means for the performance assessment and the evaluation of the air inlet passage under the condition of ultrasonic speed changing Mach number.
Description
Technical Field
The invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a supersonic speed continuous variable Mach number spray pipe based on a central body.
Background
In the development process of the high-speed aircraft, higher requirements are provided for the performance assessment and evaluation of the air inlet channel under the condition of supersonic speed continuous variable Mach number, and the ground simulation equipment is expected to provide relevant test data.
The supersonic speed continuous variable Mach number test technology of the high-speed wind tunnel mostly adopts a flexible wall spray pipe form, namely, an actuating mechanism is controlled by a hydraulic-electric system to deform a wall plate in the test process, so that the Mach number is changed. In the mode, due to the fact that the time required for controlling the deformation of the wall plate is long, at least dozens of seconds or several minutes are required for changing the very small Mach number (0.1 Mach magnitude), and the actual flight of the high-speed aircraft requires that at least 1 Mach number is continuously changed within 7-8 seconds, the flexible-wall nozzle Mach number changing technology can ensure good flow field quality, but the continuous and rapid change of the supersonic Mach number cannot be achieved fundamentally. From this perspective, the flexible wall nozzle does not have the capability of simulating a continuously variable Mach number incoming flow in the supersonic velocity range.
The unified planning wind tunnel of the American Lanli research center is a high-speed wind tunnel, and is provided with two test sections, the Mach ranges are 1.47-2.86 and 2.29-4.63 respectively, and the supersonic speed continuous variable Mach number test capability is realized by adopting a slider type spray pipe, namely a technology that the upper wall surface of the spray pipe is fixed and the lower wall surface of the spray pipe slides. However, in the technology, the upper wall surface and the lower wall surface of the spray pipe are asymmetric, so that the problems of large air flow deflection angle, speed stratification, poor Mach number uniformity and the like exist in a flow field, and therefore, the performance of the air inlet channel under the variable speed condition cannot be evaluated finely.
At present, the development of a supersonic continuous variable Mach number test technology is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a supersonic speed continuous variable Mach number nozzle based on a center body.
The supersonic speed continuous variable Mach number spray pipe based on the center body is characterized in that the spray pipe is a spray pipe box body, the upper surface of the spray pipe box body is a two-dimensional profile I, and the lower surface of the box body is a two-dimensional profile II symmetrical to the two-dimensional profile I on the upper surface; a central body is arranged on the central line of the box body, the central body is symmetrical up and down, the upper surface profile of the central body is opposite to the two-dimensional profile I, and the lower surface profile of the central body is opposite to the two-dimensional profile II; the left side and the right side of the central body are provided with sliding chutes, the left side and the right side of the nozzle box body are provided with correspondingly matched sliding rails, and the central body moves back and forth on the central line of the nozzle box body through the matching of the sliding chutes and the sliding rails; a movement control mechanism is arranged outside the spray pipe box body and controls the movement position and the movement speed of the central body; the front end face and the rear end face of the spray pipe box body are provided with sealing surrounding belts.
The molded lines of the two-dimensional molded surface I and the two-dimensional molded surface II of the spray pipe box body are all unsteady curves.
The surface profile of the upper surface of the central body and the surface profile of the lower surface of the central body are all unsteady curves.
The surface roughness of the two-dimensional molded surface I, the two-dimensional molded surface II, the central body upper surface molded surface and the central body lower surface molded surface is 0.8.
The spraying pipe box body and the central body are made of hard steel.
The surfaces of the two-dimensional molded surface I, the two-dimensional molded surface II, the central body upper surface molded surface and the central body lower surface molded surface are all plated with chrome.
The movement control mechanism controls the central body to continuously move along the slide rail.
The supersonic speed continuous variable Mach number nozzle based on the center body adopts the technology of the smooth center body nozzle, keeps the advantages of rapid change of the sliding body nozzle and good flow field quality of the flexible wall nozzle, avoids the defects of poor flow field quality of the sliding body nozzle and slow change speed of the flexible wall nozzle, can realize the change of the wind tunnel Mach number from 2.0 to 3.5 or from 3.5 to 2.0 within 3 seconds, can ensure that a high-speed wind tunnel has good flow field quality, and provides a reliable technical means for the performance assessment and the evaluation of the air inlet passage under the condition of supersonic speed variable Mach number.
Drawings
FIG. 1 is a schematic perspective view of a centerbody based supersonic continuous variable Mach nozzle of the present invention.
In the figure, 1, a spray pipe box body; 2. a two-dimensional molded surface I; 3. a two-dimensional molded surface II; 4. a central body; 5. a central body upper surface profile; 6. a central body lower surface profile; 7. a chute; 8. a slide rail; 9. a movement control mechanism; 10. sealing the shroud ring;
in the figure, the dashed line indicates the centre line of the nozzle box;
the arrows indicate the incoming flow of the high-speed wind tunnel.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the supersonic continuous variable mach number nozzle based on the central body of the invention is a nozzle box body 1, the upper surface of the nozzle box body 1 is a two-dimensional profile I2, and the lower surface of the box body is a two-dimensional profile II 3 which is symmetrical to the two-dimensional profile I2 of the upper surface; a central body 4 is arranged on the central line of the box body, the central body 4 is symmetrical up and down, a molded surface 5 on the upper surface of the central body is opposite to the two-dimensional molded surface I2, and a molded surface 6 on the lower surface of the central body is opposite to the two-dimensional molded surface II 3; the left side and the right side of the central body 4 are provided with sliding chutes 7, the left side and the right side of the nozzle box body 1 are provided with correspondingly matched sliding rails 8, and the central body 4 moves back and forth on the central line of the nozzle box body 1 through the matching of the sliding chutes 7 and the sliding rails 8; a movement control mechanism 9 is arranged outside the nozzle box body 1, and the movement control mechanism 9 controls the movement position and the movement speed of the central body 4; the front end face and the rear end face of the spray pipe box body 1 are provided with sealing surrounding belts 10.
The molded lines of the two-dimensional molded surface I2 and the two-dimensional molded surface II 3 of the spray pipe box body 1 are all unsteady curves.
The central body upper surface profile 5 and the central body lower surface profile 6 are both unsteady curves.
The surface roughness of the two-dimensional molded surface I2, the two-dimensional molded surface II 3, the central body upper surface molded surface 5 and the central body lower surface molded surface 6 is 0.8.
The material of the spray pipe box body 1 and the material of the central body 4 are both hard steel.
The surfaces of the two-dimensional molded surface I2, the two-dimensional molded surface II 3, the central body upper surface molded surface 5 and the central body lower surface molded surface 6 are all plated with chrome.
The movement control mechanism 9 controls the central body 4 to move continuously along the slide rail 8.
Example 1
When the supersonic velocity continuous variable Mach number nozzle based on the center body is used for designing the diffusion section profile of the nozzle, the throat area lower than the Mach number by 1.5 is selected as the reference area of the nozzle throat, and the diffusion section profile with the Mach number ranging from 2.0 to 3.5 is designed by adopting a characteristic line method; when the section design of the contraction section of the spray pipe is carried out, a Victorioski method is adopted; when the profile of the central body is designed, an area law method is adopted, a characteristic line method and a Victoria method are comprehensively considered, the continuous change of the flow area of the jet pipe after the central body is installed is finally realized, and the sound velocity line is arranged near the throat of the jet pipe.
The supersonic speed continuous variable Mach number nozzle outlet cross section based on the center body is 0.6m × 0.6.6 m, the Mach number of 0.1 can be changed when the center body changes by about 15mm, and the nozzle is basically linearly changed.
The concrete test procedure for the centerbody based supersonic continuous variable Mach nozzle of this embodiment is as follows:
a. dismantling the spray pipe of the high-speed wind tunnel test section, and installing a spray pipe box body 1;
b. the sealing surrounding belts 10 on the front end surface and the rear end surface of the spray pipe box body 1 are inflated, and the spray pipe box body 1 is in sealing connection with the high-speed hole body;
c. by moving the control means 9, the central body 4 is moved to the initial position;
d. starting the high-speed wind tunnel, and performing a Mach number wind tunnel test at the initial position of the central body 4 after the wind tunnel flow field is stable;
e. continuously moving the position of the central body 4 through the movement control mechanism 9 to carry out a variable Mach number wind tunnel test;
f. and closing the high-speed wind tunnel.
Claims (7)
1. The supersonic velocity continuous variable Mach number spray pipe based on the center body is characterized in that the spray pipe is a spray pipe box body (1), the upper surface of the spray pipe box body (1) is a two-dimensional profile I (2), and the lower surface of the box body is a two-dimensional profile II (3) which is symmetrical to the two-dimensional profile I (2) on the upper surface; a central body (4) is arranged on the central line of the box body, the central body (4) is symmetrical up and down, an upper surface molded surface (5) of the central body is opposite to the two-dimensional molded surface I (2), and a lower surface molded surface (6) of the central body is opposite to the two-dimensional molded surface II (3); the left side and the right side of the central body (4) are provided with sliding chutes (7), the left side and the right side of the nozzle box body (1) are provided with correspondingly matched sliding rails (8), and the central body (4) moves back and forth on the central line of the nozzle box body (1) through the matching of the sliding chutes (7) and the sliding rails (8); a movement control mechanism (9) is arranged outside the spray pipe box body (1), and the movement control mechanism (9) controls the movement position and the movement speed of the central body (4); the front end face and the rear end face of the spray pipe box body (1) are provided with sealing surrounding belts (10).
2. The centerbody based supersonic continuous variable mach number nozzle of claim 1, wherein the profiles of two-dimensional profile i (2) and two-dimensional profile ii (3) of said nozzle box (1) are both non-constant curves.
3. The supersonic continuous variable mach number nozzle based on centerbody of claim 1, wherein said centerbody upper surface profile (5) and said centerbody lower surface profile (6) are both non-constant curves.
4. The supersonic continuous variable mach number nozzle based on a centerbody according to claim 1, wherein the surface roughness of the two-dimensional profile i (2), the two-dimensional profile ii (3), the centerbody upper surface profile (5) and the centerbody lower surface profile (6) are all 0.8.
5. The supersonic continuous variable mach number nozzle based on centerbody of claim 1, wherein the nozzle case (1) and centerbody (4) are both made of hard steel.
6. The supersonic continuous variable mach number nozzle based on centerbody of claim 1, wherein the surfaces of said two-dimensional profile i (2), said two-dimensional profile ii (3), said centerbody upper surface profile (5) and said centerbody lower surface profile (6) are chrome plated.
7. The centerbody based supersonic mach number nozzle of claim 1, wherein said travel control mechanism (9) controls continuous travel of said centerbody (4) along slide rails (8).
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| CN202010497598.5A CN111487030B (en) | 2020-06-04 | 2020-06-04 | Supersonic continuous Mach number variable spray pipe based on central body |
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| CN202010497598.5A CN111487030B (en) | 2020-06-04 | 2020-06-04 | Supersonic continuous Mach number variable spray pipe based on central body |
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| CN111487030B CN111487030B (en) | 2024-05-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179605A (en) * | 2020-08-21 | 2021-01-05 | 南京航空航天大学 | Ejector nozzle experimental device for simulating outflow of aircraft |
| CN114878133A (en) * | 2022-05-18 | 2022-08-09 | 西北工业大学 | Variable Mach number test method in supersonic free jet |
| CN115371938A (en) * | 2022-07-28 | 2022-11-22 | 中国航天空气动力技术研究院 | Spray pipe suitable for hypersonic continuous variable Mach number |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179605A (en) * | 2020-08-21 | 2021-01-05 | 南京航空航天大学 | Ejector nozzle experimental device for simulating outflow of aircraft |
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| CN114878133A (en) * | 2022-05-18 | 2022-08-09 | 西北工业大学 | Variable Mach number test method in supersonic free jet |
| CN115371938A (en) * | 2022-07-28 | 2022-11-22 | 中国航天空气动力技术研究院 | Spray pipe suitable for hypersonic continuous variable Mach number |
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