CN111487030B - Supersonic continuous Mach number variable spray pipe based on central body - Google Patents
Supersonic continuous Mach number variable spray pipe based on central body Download PDFInfo
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- CN111487030B CN111487030B CN202010497598.5A CN202010497598A CN111487030B CN 111487030 B CN111487030 B CN 111487030B CN 202010497598 A CN202010497598 A CN 202010497598A CN 111487030 B CN111487030 B CN 111487030B
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- 239000007921 spray Substances 0.000 title claims abstract description 61
- 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
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 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 6
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 241001640558 Cotoneaster horizontalis Species 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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 continuous Mach number variable spray pipe based on a central 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 vertically symmetrical; the left side and the right side of the central body are provided with sliding grooves, the left side and the right side of the spray pipe box body are provided with corresponding matched sliding rails, and the central body moves back and forth on the central line of the spray pipe box body through the matching of the sliding grooves 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 center body; the front and back end surfaces of the spray pipe box body are provided with sealing shroud bands. The jet pipe adopts a sliding center body jet pipe technology, can realize the change of the Mach number of the wind tunnel 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 evaluation of the air inlet channel under the condition of ultrasonic speed change Mach number.
Description
Technical Field
The invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a supersonic continuous Mach number variable spray pipe based on a central body.
Background
In the development process of the high-speed aircraft, higher requirements are put forward on the performance assessment and evaluation of the air inlet channel under the condition of supersonic continuous Mach number change, and the ground simulation equipment is expected to provide relevant test data.
The supersonic continuous Mach number variable test technology of the high-speed wind tunnel mostly adopts a flexible wall spray pipe mode, namely, the wall plate is deformed by controlling an actuating mechanism through a hydraulic-electric system in the test process, so that Mach number change is realized. In this way, since the panel deformation control requires a long time, at least tens of seconds or several minutes, to change a small mach number (on the order of 0.1 mach number), and the actual flight of the high-speed aircraft requires that the continuous change of at least 1 mach number be completed in 7-8 seconds, the flexible wall nozzle mach number changing technology can ensure good flow field quality, but basically cannot realize continuous and rapid change of supersonic mach number. From this point of view, the flexible-wall nozzle does not have the ability to simulate a continuously variable mach number flow in the supersonic range.
The unified planning wind tunnel of the American Raney research center is a high-speed wind tunnel, and comprises two test sections, wherein Mach ranges are 1.47-2.86 and 2.29-4.63 respectively, and the supersonic continuous Mach number variable test capability is realized by adopting a sliding block 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 larger airflow deflection angle, speed layering, poor Mach number uniformity and the like exist in the flow field, and therefore, the performance of the air inlet channel under the variable speed condition cannot be finely evaluated.
Currently, there is a need to develop a supersonic continuous variable mach number test technique.
Disclosure of Invention
The invention aims to solve the technical problem of providing a supersonic continuous Mach number variable spray pipe based on a central body.
The supersonic continuous Mach number variable spray pipe based on the central 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 molded surface I, and the lower surface of the box body is a two-dimensional molded surface II symmetrical to the upper surface two-dimensional molded surface I; the central line of the box body is provided with a central body which is vertically symmetrical, the surface profile of the upper surface of the central body is opposite to the two-dimensional surface I, and the surface profile of the lower surface of the central body is opposite to the two-dimensional surface II; the left side and the right side of the central body are provided with sliding grooves, the left side and the right side of the spray pipe box body are provided with corresponding matched sliding rails, and the central body moves back and forth on the central line of the spray pipe box body through the matching of the sliding grooves 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 and back end surfaces of the spray pipe box body are provided with sealing shroud bands.
The molded lines of the two-dimensional molded surface I and the two-dimensional molded surface II of the spray pipe box body are unsteady curves.
The upper surface profile of the central body and the lower surface profile of the central body are both unsteady curves.
The surface roughness of the two-dimensional molded surface I, the two-dimensional molded surface II, the upper surface molded surface of the central body and the lower surface molded surface of the central body are all 0.8.
The material of spray tube box and center body be the rigid steel.
The surfaces of the two-dimensional molded surface I, the two-dimensional molded surface II, the upper surface molded surface of the central body and the lower surface molded surface of the central body are plated with chromium.
The movement control mechanism controls the center body to continuously move along the sliding rail.
The supersonic speed continuous variable Mach number spray pipe based on the central body adopts a sliding central body spray pipe technology, maintains the advantages of rapid change of the sliding body spray pipe and good quality of a flexible wall spray pipe flow field, avoids the defects of poor quality of the sliding body spray pipe flow field and slow change speed of the flexible wall spray pipe, can realize the change of the Mach number of a wind tunnel 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 evaluating and evaluating the performance of an air inlet channel under the condition of supersonic speed variable Mach number.
Drawings
Fig. 1 is a schematic perspective view of a supersonic continuous variable mach number nozzle based on a central body.
In the figure, 1. A spray pipe box body; 2. a two-dimensional profile I; 3. a two-dimensional profile II; 4. a central body; 5. a profile of the upper surface of the central body; 6. a profile of the lower surface of the central body; 7. a chute; 8. a slide rail; 9. a movement control mechanism; 10. sealing the shroud;
in the figure, the dotted line represents the centerline of the nozzle box;
arrows indicate the incoming flow of the high speed wind tunnel.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
As shown in FIG. 1, the supersonic continuous variable Mach number spray pipe based on the central body is a spray pipe box body 1, the upper surface of the spray pipe box body 1 is a two-dimensional profile I2, and the lower surface of the box body is a two-dimensional profile II 3 symmetrical with the upper surface two-dimensional profile I2; a central body 4 is arranged on the central line of the box body, the central body 4 is vertically symmetrical, the surface profile 5 of the upper surface of the central body is opposite to the two-dimensional surface I2, and the surface profile 6 of the lower surface of the central body is opposite to the two-dimensional surface II 3; the left side and the right side of the central body 4 are provided with sliding grooves 7, the left side and the right side of the spray pipe box body 1 are provided with corresponding matched sliding rails 8, and the central body 4 moves back and forth on the central line of the spray pipe box body 1 through the matching of the sliding grooves 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 center body 4; the front and rear end surfaces of the nozzle box body 1 are provided with sealing shroud bands 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 upper surface profile 5 and the lower surface profile 6 of the central body are both unsteady curves.
The surface roughness of the two-dimensional molded surface I2, the two-dimensional molded surface II 3, the upper surface molded surface 5 of the central body and the lower surface molded surface 6 of the central body are all 0.8.
The spray pipe box body 1 and the central body 4 are made of hard steel.
The surfaces of the two-dimensional molded surface I2, the two-dimensional molded surface II 3, the upper surface molded surface 5 of the central body and the lower surface molded surface 6 of the central body are plated with chromium.
The movement control mechanism 9 controls the center body 4 to continuously move along the sliding rail 8.
Example 1
When the supersonic continuous variable Mach number spray pipe based on the central body is used for designing the spray pipe diffusion section profile, the throat area lower than Mach number 1.5 is selected as the reference area of the spray pipe throat, and the diffusion section profile with Mach number ranging from 2.0 to 3.5 is designed by adopting a characteristic line method; when the profile design of the shrinkage section of the spray pipe is carried out, a Veduo-sinsky method is adopted; when the surface design of the central body is performed, an area law method is adopted, a characteristic line method and a Veduo-sinese method are comprehensively considered, continuous change of the flow area of the spray pipe after the central body is additionally arranged is finally realized, and a sound velocity line is arranged near the throat of the spray pipe.
The cross section of the supersonic speed continuous variable Mach number spray pipe based on the central body is 0.6m×0.6m, and each time the central body changes by about 15mm, 0.1 Mach number can be changed and basically linearly changed. The streamline is converged at the trailing edge of the central body at the same speed and same direction when seen along the downstream direction.
The specific test process of the supersonic continuous variable Mach number spray pipe based on the central body in the embodiment is as follows:
a. removing the spray pipe of the high-speed wind tunnel test section, and installing a spray pipe box body 1;
b. The sealing shroud 10 on the front end surface and the rear end surface of the spray pipe box body 1 is inflated, and the spray pipe box body 1 is in sealing connection with the high-speed hole body;
c. the central body 4 is moved to the initial position by the movement control mechanism 9;
d. Starting a high-speed wind tunnel, and after the flow field of the wind tunnel is stable, carrying out Mach number wind tunnel test at the initial position of the central body 4;
e. Continuously moving the position of the central body 4 through the movement control mechanism 9 to perform a Mach number variable wind tunnel test;
f. Closing the high-speed wind tunnel.
Claims (5)
1. The supersonic continuous Mach number variable spray pipe based on the central 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 molded surface I (2), and the lower surface of the box body is a two-dimensional molded surface II (3) symmetrical with the upper surface two-dimensional molded surface I (2); a central body (4) is arranged on the central line of the box body, the central body (4) is vertically symmetrical, the surface profile (5) of the upper surface of the central body is opposite to the two-dimensional surface I (2), and the surface profile (6) of the lower surface of the central body is opposite to the two-dimensional surface II (3); the left side and the right side of the central body (4) are provided with sliding grooves (7), the left side and the right side of the spray pipe box body (1) are provided with sliding rails (8) which are correspondingly matched, and the central body (4) moves back and forth on the central line of the spray pipe box body (1) through the matching of the sliding grooves (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 shroud bands (10);
the molded lines of the two-dimensional molded surface I (2) and the two-dimensional molded surface II (3) of the spray pipe box body (1) are unsteady curves;
The upper surface profile (5) of the central body and the lower surface profile (6) of the central body are both unsteady curves.
2. The supersonic continuous variable mach number nozzle based on the central body according to claim 1, wherein the surface roughness of the two-dimensional profile i (2), the two-dimensional profile ii (3), the central body upper surface profile (5) and the central body lower surface profile (6) is 0.8.
3. The supersonic continuous variable Mach number nozzle based on the central body according to claim 1, wherein the nozzle box body (1) and the central body (4) are made of hard steel.
4. The supersonic continuous variable mach number nozzle based on the central body according to claim 1, wherein the surfaces of the two-dimensional profile i (2), the two-dimensional profile ii (3), the upper surface profile (5) of the central body and the lower surface profile (6) of the central body are plated with chromium.
5. The supersonic continuous variable mach number nozzle based on the central body according to claim 1, wherein the movement control mechanism (9) controls the central body (4) to move continuously along the slide rail (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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| CN111487030B true CN111487030B (en) | 2024-05-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179605B (en) * | 2020-08-21 | 2021-10-01 | 南京航空航天大学 | Ejector nozzle experimental device for simulating outflow of aircraft |
| CN114878133B (en) * | 2022-05-18 | 2023-07-28 | 西北工业大学 | Variable Mach number test method in supersonic free jet |
| CN115371938B (en) * | 2022-07-28 | 2024-07-23 | 中国航天空气动力技术研究院 | Spray pipe suitable for hypersonic continuous Mach number change |
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