CN107941450A - A kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel - Google Patents
A kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel Download PDFInfo
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- CN107941450A CN107941450A CN201710855108.2A CN201710855108A CN107941450A CN 107941450 A CN107941450 A CN 107941450A CN 201710855108 A CN201710855108 A CN 201710855108A CN 107941450 A CN107941450 A CN 107941450A
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- 238000012360 testing method Methods 0.000 description 17
- 238000009434 installation Methods 0.000 description 9
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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
Abstract
The invention discloses a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel, including spout (2), two turbulents (1) are installed with each wall of the spout；Wherein, the turbulent by the turbulent bottom surface (11) of rectangle, two flow-disturbing body side surfaces (14) and flows to the convex structure that surface (12) forms.The angle eddy generator has carried out spout air-flow the corner water conservancy diversion of long range, change the direction of vortex, the large-scale vortex structure produced by shear layer unstability is destroyed, largely inhibits low frequency to pulse, the pulsation of wind-tunnel low frequency can be greatly reduced.
Description
Technical field
The present invention relates to a kind of spout angle eddy generator, is specifically that a kind of opening jet stream wind-tunnel low frequency that suppresses is pulsed
Spout angle eddy generator, belongs to wind tunnel technique field.
Background technology
Since the shear layer (Kelvin-Helmholtz) of jet boundary is unstable, free jet can be certain in spout downstream
Distance produces large-scale vortex structure because of shear layer unstability.These vortex structures and the collector in opening jet stream test chamber downstream
And its pressure fluctuation interaction of reflection, cause test section flow field to produce low frequency pulsation.Low frequency pulsation destroys stream
Field quality, seriously affects the aerodynamics of test model and the precision of pneumatic acoustic measurement.In order in opening jet stream wind-tunnel
The middle aerodynamics for carrying out high quality and aerodynamic noise experimental study, control the low-frequency oscillation of jet stream wind-tunnel, obtain relatively steady
Fixed flow field and sound field test environment, are just particularly important.In addition, flow field and hole body knot caused by low frequency pulsation
Interaction between structure vibration and whirlpool-sound can all cause energy loss, therefore slacken or suppress low frequency pulsation, to saving
The energy and raising opening jet stream wind tunnel energy utilization ratio also have positive effect.
In the prior art, two ways is mainly included to the control measure of low frequency pulsation.
One kind is：Collector structure shape optimum；Its control principle be by varying collector physical dimension and shape etc.,
Reduce the pressure oscillation that collector is produced with large-scale vortex structure interaction.The difficult point and defect of which are to design tired
Hardly possible, quantities are big, particularly for the wind-tunnel built up, change collector structure and shape suffers from hole body structure limit
System.
Another is：In efflux nozzle installation vortex generator, (traditional vortex generator is mostly rectangle or triangle
Two-dimentional spoiler, and the three-dimensional eddy current such as cube, pyrometric cone generator)；Its control principle be by producing microvortex,
Shear layer is promoted to turn to twist as turbulent flow, and turbulent flow can suppress the formation of shear layer large-scale structure, and then suppress low frequency arteries and veins
It is dynamic.Such as Fig. 1 in the prior art at rectangular aperture jet stream wind tunnel spout, to be provided with turbulent (spout lower wall equidistantly staggeredly
It is not distributed), it is illustrated in figure 2 in the prior art at rectangular aperture jet stream wind tunnel spout, continuously arranged triangle is installed
Shape turbulent (spout lower wall is not distributed).The drawbacks of this kind of vortex generator is brought has：1) either spoiler or turbulent,
Corner angle seamed edge is more in shape, brings itself high-frequency noise, seriously affects acoustic measurement；2) circumferentially distributed mode and installation
Number is more (spout about installs 20~30 in one week), test measurement section laminar flow die area reduced, destroyed flow field
Quality, for example make the field of direction, turbulivity increase etc., aerodynamic measurement is seriously affected, and the high-frequency noise being superimposed is tighter
Weight；3) material is mostly metal, and installation is complicated, and to existing wind tunnel spout, there are certain destruction；4) it is flexible material to also have one kind,
Cracky after by wind load, and itself easy forced vibration, high-frequency noise are strong.Generally speaking, such mode has the following disadvantages：One
It is that control effect is limited, low frequency pulsation amplitude can not be greatly reduced；Second, traditional vortex generator to turn
Jet boundary layer after twisting has the flowing mixing efficiency of higher, and jet boundary rate of expansion faster, thus can be used for experiment
The area of laminar flow core will reduce；Third, vortex generator produces high-frequency noise after causing flow transition, acoustics is surveyed
Amount brings adverse effect.In addition, with the enhancing of means of testing, and by trial-ray method test index requirement is improved,
Existing vortex generator control means have been unable to meet advanced aircraft/bullet train/automobile etc. to high accuracy, high-quality measurement
The demand of test result.
The content of the invention
For the above-mentioned prior art there are problem, the present invention provides a kind of suppression opening jet stream wind-tunnel low frequency pulsation
Spout angle eddy generator, is changed by the configuration design to vortex generator and distribution mode, wind-tunnel can be greatly lowered
While low frequency is pulsed, the laminar flow die area of experiment is not reduced, and do not increase high frequency background noise.
The present invention is achieved through the following technical solutions above-mentioned purpose：One kind suppresses the low frequency pulsation of opening jet stream wind-tunnel
Spout angle eddy generator, including spout, is installed with two turbulents on each wall of the spout；Wherein, it is described to disturb
Fluid is by the turbulent bottom surface of rectangle, two flow-disturbing body side surfaces and the convex structure for flowing to surface composition.
Further, the spout is made of four walls, and two terminations of each wall are respectively provided with a turbulent.
Further, the surface that flows to is curved-surface structure.
Further, the surface that flows to is airfoil camber structure.
Further, the flow-disturbing body side surface and flow to surface contact position and be provided with chamfering.
Further, the flow-disturbing body side surface and flow to surface and at right angles connect.
Further, the turbulent, the size relationship flowed between surface, spout and chamfering are：
L1=L5 × (0.5~1)；
L2=L4 × (0.02~0.1)；
L3=L1 × (0.05~0.2)；
R1=L1 × (1.5~3)；
R2=L3 × (0.001~0.5)；
Wherein, a length of L1 in turbulent bottom surface, width L2；Turbulent bottom surface to the surface highest point that flows to highly is L3；
It is R1 to flow to surface subsequent corrosion；Chamfer radius are R2；L4 is width of jet, and L5 is spout depth, and L6 is spout.
Further, the turbulent front end and the spout outlet distance are L7, the flow-disturbing body side surface with it is adjacent described
The distance of the side wall of spout is L8, and the distance of the flow-disturbing body side surface being installed on the spout side wall and adjacent ports wall is L9；
Size relationship between them is：
L7=L5 × (0~0.1)；
L8=L4 × (0.02~0.1)；
L9=L6 × (0.02~0.1)；
Wherein, L4 is width of jet, and L5 is spout depth, and L6 is spout.
The beneficial effects of the invention are as follows：The angle eddy generator has carried out spout air-flow the corner water conservancy diversion of long range, changes
The direction of vortex, destroys the large-scale vortex structure produced by shear layer unstability, largely inhibits low frequency pressure
Power is pulsed, and can significantly reduce the pulsation of wind-tunnel low frequency；The angle eddy generator employ flow to surface in long curved surface and
Chamfer design, avoids the polygonal high-frequency noise brought of more ribs in shape, will not increase high frequency background noise；Angle eddy generator peace
The end position of four walls loaded on spout, i.e. four walls are in contact position, retain the main part of spout 4 walls up and down
Original appearance, avoids circumferential a large amount of destructions of the turbulent to test measurement section flow field quality of spout；It can ensure not reduce experiment
Laminar flow die area；The angle eddy generator installation is not simple easily damaged, can obtain the test result of high accuracy and high quality.
Brief description of the drawings
Fig. 1 is wind tunnel spout rectangular vortex generator in the prior art；
Fig. 2 is wind tunnel spout triangle vortex generator in the prior art；
Fig. 3 is eddy generator overall structure diagram in angle of the present invention；
Fig. 4 is installed on spout main structure diagram for angle eddy generator of the present invention；
Fig. 5 is the turbulent structure diagram of the present invention；
Fig. 6 is the turbulent main structure diagram of the present invention；
Fig. 7 is the turbulent overlooking the structure diagram of the present invention；
Fig. 8 is main body cover schematic cross-section of the present invention；
Fig. 9 is the pressure fluctuation coefficient Cp contrasts before and after established angle eddy generator in embodiment；
Figure 10 is the far field ambient noise SPL contrasts before and after established angle eddy generator in embodiment；
Figure 11 is the turbulivity contrast before and after established angle eddy generator in embodiment；
Figure 12 is vortex generator in the circumferentially distributed installation front view of spout；
Figure 13 is that spout is circumferentially distributed in embodiment and the pressure fluctuation coefficient Cp of corner distribution eddy generator is contrasted；
Figure 14 is Cp pairs of the test section center static pressure ripple factor that flexible spoiler and angle eddy generator are installed in embodiment
Than；
Figure 15 is the far field ambient noise SPL contrasts that flow guiding unit and angle eddy generator are installed in embodiment；
In figure：1st, turbulent, 2, spout, 11, turbulent bottom surface, 12, flow to surface, 13, chamfering, 14, flow-disturbing body side surface.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
As shown in Figure 3：A kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel, which occurs
Device is based on the configuration design and the redesign of distribution mode to turbulent, and all turbulents that will be installed in spout
A kind of device formed, is referred to as angle eddy generator.
The angle eddy generator includes spout 2, and the spout 2 is surrounded by four walls, and the end of four walls is end to end, so that
Form the rectangular-shape structure of both ends open.
As shown in Figure 4：It is installed with two turbulents 1 on four walls of spout 2, specifically each wall
Two tip positions respectively install a turbulent 1.The turbulent 1 is disturbed including a rectangular-shaped turbulent bottom surface 11, two
Fluid side 14 and one flow to surface 12, in other words, as shown in figure 5, the turbulent 1 is by turbulent bottom surface 11, turbulent
Side 14 and flow to surface 12 and constitute a convex structure.
The surface 12 that flows to can be curved-surface structure or airfoil camber structure.
Can there is no chamfering (the flow-disturbing body side surface and flow to surface at right angles connect) on the turbulent 1, can also
Chamfering is set, and chamfering is located at the flow-disturbing body side surface 14 and flows to the contact position on surface 12.
The configuration design of turbulent 11：Such as Fig. 3, Fig. 4, Fig. 6 to Fig. 8, the turbulent 11, flow to surface 2,1 and of spout
Size relationship between chamfering 13 is：
L1=L5 × (0.5~1)；
L2=L4 × (0.02~0.1)；
L3=L1 × (0.05~0.2)；
R1=L1 × (1.5~3)；
R2=L3 × (0.001~0.5)；
Wherein, a length of L1 in turbulent bottom surface, width L2；Turbulent bottom surface to the surface highest point that flows to highly is L3；
It is R1 to flow to surface subsequent corrosion；Chamfer radius are R2；L4 is width of jet, and L5 is spout depth, and L6 is spout.
Angle eddy generator is designed in the installation distribution mode of spout：As shown in Figure 3 and Figure 4,1 front end of turbulent and institute
It is L7 to state the outlet of spout 2 distance, and the distance of the flow-disturbing body side surface 14 and the side wall of the adjacent spout 2 is L8, is installed on institute
The distance for stating flow-disturbing body side surface 14 on 2 side wall of spout and 2 wall of adjacent ports is L9；
Size relationship between them is：
L7=L5 × (0~0.1)；
L8=L4 × (0.02~0.1)；
L9=L6 × (0.02~0.1)；
Wherein, L4 is width of jet, and L5 is spout depth, and L6 is spout.
As shown in Figure 9：The spout of vortex generator and the pressure being provided with before and after the spout of angle eddy generator are not installed
Ripple factor Cp is contrasted, and angle eddy generator has carried out spout air-flow the water conservancy diversion of relatively long distance, is changed former vortex direction, is destroyed
The large-scale vortex structure that is produced by shear layer unstability, largely inhibits low frequency to pulse.
As shown in Figure 10：Far field ambient noise SPL contrasts before and after established angle eddy generator, angle eddy generator suppress effect
Fruit is obvious, and especially wind-tunnel is often also the strong wind speed 60m/s~70m/s scopes of pressure fluctuation with wind speed, far field low frequency
Pulsation decreases by 70%~80%, since the flow surface of angle eddy generator in long curved surface and goes corner angle to design, avoids shape
The upper polygonal high-frequency noise brought of more ribs, and established angle eddy generator rear backdrop noise and be not apparent from increasing.
As shown in Figure 11：Since angle eddy generator is only distributed in spout corner, 8 are installed altogether, makes spout up and down
The main part of 4 walls retains original appearance, avoids circumferential a large amount of destructions of the turbulent to test measurement section flow field quality of spout.By
As it can be seen that turbulivity reduces on the whole in the range of common wind speed 50m/s~70m/s after established angle eddy generator, especially in figure
It is at test measurement center (at axial 5m).
As shown in figure 12：Circumferentially distributed mode of the vortex generator in spout；As shown in figure 13, circumferentially distributed mode and angle
The test section far field force ripple factor Cp of part mode for cloth.As it can be seen that compared with circumferentially distributed, the corner distribution of angle eddy generator
Mode, makes the low frequency of the strong wind speed 60m/s~70m/s scopes of pressure fluctuation pulse and substantially weakens.Further, since vortex
The installation number of generator is greatly decreased, and test section flow field quality and sound field qualitative effects are obviously reduced.
As shown in figure 14：Spout installs the test section center static pressure ripple factor of flexible spoiler and angle eddy generator respectively
Cp is contrasted.As it can be seen that compared with the flexible spoiler of installation, after established angle eddy generator, hence it is evident that reduce the static pressure at test section center
Pulsation.In addition, the shortcomings that avoiding flexible material itself easily vibration and exciting other frequency ranges to pulse.
As shown in figure 15：Spout installs the far field ambient noise SPL of jet stream flow guiding unit and angle eddy generator.As it can be seen that with
Installation flow guiding unit is compared, and after established angle eddy generator, is significantly reduced far field ambient noise, is decreased by 5~10dB.
Embodiment provided above is the better embodiment of the present invention, is only used for the convenient explanation present invention, not to this hair
The limitation of bright work in any form, any those of ordinary skill in the art, if putting forward skill not departing from the present invention
In the range of art feature, the local equivalent embodiment changed or modify is made using disclosed technology contents, and
Without departing from the technical feature content of the present invention, in the range of still falling within the technology of the present invention feature.
Claims (8)
1. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel, including spout (2), its feature exist
In：Two turbulents (1) are installed with each wall of the spout (2)；Wherein, the turbulent (1) is by rectangle
Turbulent bottom surface (11), two flow-disturbing body side surfaces (14) and the convex structure for flowing to surface (12) composition.
2. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 1, its
It is characterized in that：The spout (2) is made of four walls, and two terminations of each wall are respectively provided with a turbulent (1).
3. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 1, its
It is characterized in that：The surface (12) that flows to is curved-surface structure.
4. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 1, its
It is characterized in that：The surface (12) that flows to is airfoil camber structure.
5. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 1, its
It is characterized in that：The flow-disturbing body side surface (14) and flow to surface (12) contact position and be provided with chamfering (13).
6. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 1, its
It is characterized in that：The flow-disturbing body side surface (14) and flow to surface (12) and at right angles connect (13).
7. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 5, its
It is characterized in that：The turbulent (11), the size relationship flowed between surface (2), spout (1) and chamfering (13) are：
L1=L5 × (0.5~1)；
L2=L4 × (0.02~0.1)；
L3=L1 × (0.05~0.2)；
R1=L1 × (1.5~3)；
R2=L3 × (0.001~0.5)；
Wherein, a length of L1 in turbulent bottom surface, width L2；Turbulent bottom surface to the surface highest point that flows to highly is L3；Flow direction
Surface curve radius is R1；Chamfer radius are R2；L4 is width of jet, and L5 is spout depth, and L6 is spout.
8. a kind of spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel according to claim 5, its
It is characterized in that：Turbulent (1) front end and the spout (2) outlet distance are L7, the flow-disturbing body side surface (14) with it is adjacent
The distance of the side wall of the spout (2) is L8, the flow-disturbing body side surface (14) and adjacent ports being installed on the spout (2) side wall
(2) distance of wall is L9；
Size relationship between them is：
L7=L5 × (0~0.1)；
L8=L4 × (0.02~0.1)；
L9=L6 × (0.02~0.1)；
Wherein, L4 is width of jet, and L5 is spout depth, and L6 is spout.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710855108.2A CN107941450B (en) | 2017-09-20 | 2017-09-20 | Jet angle vortex generator for inhibiting low-frequency pressure pulsation of open jet wind tunnel |
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| CN201710855108.2A CN107941450B (en) | 2017-09-20 | 2017-09-20 | Jet angle vortex generator for inhibiting low-frequency pressure pulsation of open jet wind tunnel |
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Cited By (5)
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| CN108953231A (en) * | 2018-09-04 | 2018-12-07 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of collector air inlet device of centrifugal blower |
| CN111929026A (en) * | 2020-09-29 | 2020-11-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Low-frequency pressure pulsation suppression method for wind tunnel 3/4 opening test section |
| CN114985127A (en) * | 2022-07-15 | 2022-09-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for changing jet flow shape |
| CN116242576A (en) * | 2023-05-11 | 2023-06-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
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| CN111929026A (en) * | 2020-09-29 | 2020-11-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Low-frequency pressure pulsation suppression method for wind tunnel 3/4 opening test section |
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| CN114985127A (en) * | 2022-07-15 | 2022-09-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for changing jet flow shape |
| CN114985127B (en) * | 2022-07-15 | 2022-11-01 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for changing jet flow shape |
| CN116242576A (en) * | 2023-05-11 | 2023-06-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
| CN116242576B (en) * | 2023-05-11 | 2023-07-25 | 中国空气动力研究与发展中心低速空气动力研究所 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
| CN117740308A (en) * | 2024-02-19 | 2024-03-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Jet micro-embedded turbulence method and device for controlling large-scale high-speed jet noise |
| CN117740308B (en) * | 2024-02-19 | 2024-04-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Jet micro-embedded turbulence method and device for controlling large-scale high-speed jet noise |
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| CN107941450B (en) | 2023-11-03 |
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