CN116242576B - Floor suitable for open wind tunnel with floor test and open wind tunnel with floor - Google Patents
Floor suitable for open wind tunnel with floor test and open wind tunnel with floor Download PDFInfo
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- CN116242576B CN116242576B CN202310526161.3A CN202310526161A CN116242576B CN 116242576 B CN116242576 B CN 116242576B CN 202310526161 A CN202310526161 A CN 202310526161A CN 116242576 B CN116242576 B CN 116242576B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention relates to the technical field of wind tunnel tests, and discloses a floor suitable for an open wind tunnel with floor test and an open wind tunnel with floor, which are used for inhibiting low-frequency pressure oscillation in the open wind tunnel with floor test, wherein separation vortex inhibiting structures are arranged on two sides of the floor. Wherein the separation vortex suppression structure is a plurality of groups of wing structures; each set of wing-like structures includes a first wing and a second wing; the first wing and the second wing are symmetrically arranged on two sides of the floor by taking the floor as a symmetry axis. The first wing and the second wing both comprise an upper triangle and a lower triangle which are identical in shape; the apex angle of the upper triangle and the lower triangle face the direction far away from the floor, the bottom edge of the upper triangle is connected with the upper edge of the floor, and the bottom edge of the lower triangle is connected with the lower edge of the floor. The invention aims at the principle of amplifying low-frequency pressure oscillation on the floor and effectively controls the low-frequency pressure oscillation in the open wind tunnel with floor test.
Description
Technical Field
The invention relates to the technical field of wind tunnel tests, in particular to a floor board suitable for an open wind tunnel test with a floor board and an open wind tunnel with the floor board.
Background
Wind tunnels are profiled pipes that manually create a controlled flow of air through the test section passageway. In the wind tunnel test, a flying object or a model thereof is placed in an artificial flow field of a wind tunnel test section, the flowing state of the flying object or the model thereof is observed, and the related physical quantity of the flying object or the model thereof is measured. The wind tunnel residence chamber is a place where the open wind tunnel measures the flying object or the model thereof, and the nozzle, the test section and the collector are all positioned in the residence chamber.
The low frequency pressure oscillation phenomenon is a phenomenon commonly existing in open wind tunnels. The typical manifestation is that under specific test wind speeds, strong low-frequency pressure oscillation similar to single-frequency characteristics exists in wind tunnel jet flow and a residence chamber. The low frequency pressure oscillations destroy the flow field quality and acoustic field quality, severely affecting the accuracy of aerodynamic measurements and aeroacoustic measurements. In order to develop high-quality aerodynamic and aerodynamic noise test research in an open wind tunnel, it is particularly important to control low-frequency oscillation of a jet wind tunnel and obtain relatively stable flow field and sound field test environments. In addition, low frequency pressure oscillations cause flow field and cavity structure oscillations and vortex-to-acoustic interactions that also result in energy losses. Therefore, the low-frequency pressure oscillation is weakened or inhibited, and the method has positive significance for saving energy and improving the energy utilization efficiency of the open wind tunnel.
As shown in fig. 1, when testing a high-speed train, an automobile, or the like, it is necessary to install a test floor in a wind tunnel to simulate an actual ground. This makes the wind tunnel a special type of open wind tunnel, characterized in that the rectangular jet is in direct contact with the floor. Test results show that after the floor is installed, the low-frequency pressure oscillation of the open wind tunnel is obviously stronger, and the pneumatic noise test of ground traffic vehicles such as transport airplanes, high-speed trains and the like is seriously influenced, so that the air tunnel is one of the difficulties to be solved in the design and construction stages of the wind tunnel.
The low-frequency pressure oscillation control measures at home and abroad mainly comprise optimization of the structure shape of a collector, an eddy generator of a nozzle, structural optimization of a resident chamber and a resonant cavity at a wind tunnel loop. Collector structural optimization typically requires time-consuming model wind tunnel experiments for iterative design, and collector modifications typically affect the pressure distribution in the test area. The spout mounted vortex generators typically reduce the effective core test area of the test section and introduce high frequency background noise, which has a significant impact on acoustic measurements. The structure of the residence chamber is complex, and particularly for large wind tunnels, the engineering amount for optimizing the structural shape of the residence chamber is large and the cost is very high. The design of the resonant cavity must be considered at the beginning of the wind tunnel design and can only suppress low frequency oscillations propagating along the wind tunnel pipe loop, with limited effect on the suppression of oscillations of other propagation paths. Moreover, the common measures are aimed at the conventional open wind tunnel, and the low-frequency oscillation suppression measures which are specially aimed at the open wind tunnel with the floor are fewer internationally.
Disclosure of Invention
The invention aims to provide a floor suitable for an open wind tunnel with floor test and an open wind tunnel with floor, so as to solve the problem of low-frequency pressure oscillation during the open wind tunnel with floor test.
The floor suitable for the open wind tunnel with floor test is used for inhibiting low-frequency pressure oscillation in the open wind tunnel with floor test, and separation vortex inhibiting structures are arranged on two sides of the floor.
In some preferred embodiments, the separation vortex suppression structure is a plurality of sets of wing-like structures; each set of wing-like structures includes a first wing and a second wing; the first wing and the second wing are symmetrically arranged on two sides of the floor by taking the floor as a symmetry axis.
In some preferred embodiments, the first wing and the second wing each comprise an upper triangle and a lower triangle that are identical in shape; the apex angle of the upper triangle and the lower triangle face the direction far away from the floor, the bottom edge of the upper triangle is connected with the upper edge of the floor, and the bottom edge of the lower triangle is connected with the lower edge of the floor.
In some preferred embodiments, the upper triangle and the lower triangle have the same angle θ with the floor, 90 ° < θ < 180 °.
In some preferred embodiments, the upper triangle and the lower triangle are isosceles triangles.
In some preferred embodiments, each set of wing structures is mounted in series.
In some preferred embodiments, each set of wing structures is mounted in spaced apart relation.
In some preferred embodiments, the pitch of each set of wing structures is equal.
In some preferred embodiments, the wing-like structure employs sound absorbing material and sound absorbing structure.
The invention also provides an open wind tunnel suitable for the open wind tunnel with floor test, which comprises a resident room, and a floor, a spout and a collector which are arranged in the resident room, wherein the floor is suitable for the open wind tunnel with floor test.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the invention aims at the principle of amplifying low-frequency pressure oscillation on the floor and effectively controls the low-frequency pressure oscillation in the open wind tunnel with floor test.
2. The invention has simple structure and is easy to improve the existing floor device;
3. the installation positions of the invention are arranged on two sides of the floor, so that the test area of the upper surface of the floor is maintained, and the effective test space area is not damaged;
4. the wing-shaped structure of the invention adopts the sound absorption material and the sound absorption structure, thereby effectively controlling the noise.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an open wind tunnel with a floor.
FIG. 2 is a schematic diagram of the principle of floor enhanced low frequency pressure oscillations in open wind tunnel with floor test.
FIG. 3a is a schematic view of a floor continuous installation for suppressing low frequency pressure oscillations in an open wind tunnel with floor test in accordance with an embodiment of the present invention.
FIG. 3b is a schematic illustration of a floor spacer arrangement for suppressing low frequency pressure oscillations during open wind tunnel floor tests in accordance with an embodiment of the present invention.
FIG. 4 is a schematic diagram of the method for suppressing low-frequency pressure oscillations when using the floor shown in FIG. 3a or FIG. 3b for open wind tunnel with floor test according to an embodiment of the present invention.
Icon: 1-resident room, 10-floor, 11-first wing, 12-second wing, 20-spout, 30-collector.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, when an open wind tunnel with floor test is performed, a test model such as a high-speed train is placed on the floor 10, and air flows out from the nozzle 20, passes through the jet test section and enters the collector 30, in which case the low-frequency pressure oscillation of the open wind tunnel is significantly stronger. Specifically:
due to shear layer (KH) instability at the jet boundary, the free jet will create a large scale vortex structure at a distance downstream of the jet orifice 20 due to shear layer instability. These vortex structures interact with the collector 30 downstream of the open wind tunnel test section and its reflected pressure pulsations, causing low frequency pressure oscillations to occur in the residence chamber 1 and in the jet flow field of the open wind tunnel. As shown in fig. 2, after the floor 10 is installed, the movement of the air flow over the floor 10 causes the upper surface of the floor 10 to be at a lower pressure than the lower surface, thereby inducing a pressure difference between the upper surface and the lower surface of the floor 10. The lower surface air flow is turned up to the upper surface under the drive of the pressure difference, thereby forming separation vortices like wingtip vortices on both sides of the upper surface. The separation vortex on the left and right sides of the floor 10 changes the intensity alternately under the alternating action of the pressure standing wave in the width direction, so that the pressure standing wave in the width direction is further enhanced, and the low-frequency pressure oscillation of the open wind tunnel is obviously stronger.
Therefore, in order to solve the technical problem, the present embodiment proposes a floor board 10 suitable for open wind tunnel with floor test, and both sides of the floor board 10 have a separation vortex suppression structure. Some preferred embodiments of the separation vortex suppression structure are given in this example, as follows:
as shown in fig. 3a and 3b, the separation vortex suppression structure is a multi-group wing structure; each set of wing-like structures comprises a first wing 11 and a second wing 12; the first wing 11 and the second wing 12 are symmetrically installed at both sides of the floor 10 with the floor 10 as a symmetry axis. Further, as shown in fig. 3a and 3b, the first wing 11 and the second wing 12 each comprise an upper triangle and a lower triangle which are identical in shape; the apex angle of the upper triangle and the lower triangle is directed away from the floor 10, the base of the upper triangle is connected to the upper edge of the floor 10, and the base of the lower triangle is connected to the lower edge of the floor 10. It should be noted that the upper triangle and the lower triangle have a certain thickness, and the specific thickness can be designed according to the requirement.
In some preferred embodiments, the upper triangle and the lower triangle have the same angle θ with the floor 10, 90 ° < θ < 180 °, and specific angle values may be determined as desired.
In some preferred embodiments, the upper triangle and the lower triangle are isosceles triangles.
In some preferred embodiments, each set of wing-like structures is mounted either consecutively (as shown in fig. 3 a) or at intervals (as shown in fig. 3 b). When installed at intervals, the wing structures of each set are equally spaced.
In some preferred embodiments, the wing-like structure employs a sound absorbing material and a sound absorbing structure, such as a composite structure of sound absorbing cotton and a perforated plate, etc., under the premise of ensuring structural strength.
With the above-described design, as shown in fig. 4, the separation vortex suppressing structures of the wing-like structures are attached to both side edges of the floor panel 10, and the airflow can be suppressed from flowing to the upper surface, thereby suppressing the formation of separation vortices on the upper surface.
Example 2
The embodiment provides an open wind tunnel with a floor 10, which comprises a resident room 1, and the floor 10, a spout 20 and a collector 30 which are arranged in the resident room 1, wherein the floor 10 is the floor 10 applicable to the open wind tunnel floor test in embodiment 1.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The floor suitable for the open wind tunnel with floor test is used for inhibiting low-frequency pressure oscillation in the open wind tunnel with floor test, and is characterized in that two sides of the floor (10) are provided with separation vortex inhibiting structures;
the separation vortex suppression structure is a plurality of groups of wing structures; each set of wing-like structures comprises a first wing (11) and a second wing (12); the first wing (11) and the second wing (12) are symmetrically arranged at two sides of the floor (10) by taking the floor (10) as a symmetry axis;
the first wing (11) and the second wing (12) comprise an upper triangle and a lower triangle which are identical in shape; the apex angle of the upper triangle and the lower triangle face to the direction far away from the floor (10), the bottom edge of the upper triangle is connected with the upper edge of the floor (10), and the bottom edge of the lower triangle is connected with the lower edge of the floor (10).
2. -floor panel for the application of open wind tunnel with floor tests according to claim 1, characterized in that said upper and lower triangle have the same angle θ with the floor panel (10), 90 ° < θ < 180 °.
3. The floor for an open wind tunnel with floor test according to claim 1, wherein the upper triangle and the lower triangle are isosceles triangles.
4. The floor for an open wind tunnel with floor test according to claim 1, wherein each set of wing structures is mounted in series.
5. The floor for an open wind tunnel with floor test of claim 1, wherein each set of wing structures are mounted at intervals.
6. The floor for an open wind tunnel with floor test according to claim 5, wherein the pitch of each set of wing structures is equal.
7. The floor for an open wind tunnel with floor test according to claim 1, wherein the wing structure is made of a sound absorbing material and a sound absorbing structure.
8. Open wind tunnel with floor comprising a residence chamber (1) and a floor (10), a spout (20) and a collector (30) arranged inside the residence chamber (1), characterized in that the floor (10) is a floor suitable for open wind tunnel floor tests according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310526161.3A CN116242576B (en) | 2023-05-11 | 2023-05-11 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310526161.3A CN116242576B (en) | 2023-05-11 | 2023-05-11 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
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| Publication Number | Publication Date |
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| CN116242576A CN116242576A (en) | 2023-06-09 |
| CN116242576B true CN116242576B (en) | 2023-07-25 |
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| CN202310526161.3A Active CN116242576B (en) | 2023-05-11 | 2023-05-11 | Floor suitable for open wind tunnel with floor test and open wind tunnel with floor |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067584A (en) * | 2007-06-14 | 2007-11-07 | 同济大学 | Opening back-flowing suppressing low-speed wind tunnel low-frequency buffeting ejector structure |
| CN107941450A (en) * | 2017-09-20 | 2018-04-20 | 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 spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel |
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|---|---|---|---|---|
| GB683865A (en) * | 1951-04-23 | 1952-12-03 | United Aircraft Corp | Improvements in or relating to fluid mixing device |
| JP3315677B2 (en) * | 2000-02-01 | 2002-08-19 | 川崎重工業株式会社 | Silencer for wind tunnel experiments |
| JP4427652B2 (en) * | 2005-06-28 | 2010-03-10 | 独立行政法人 宇宙航空研究開発機構 | Low frequency gain doubling control in magnetic support balance device |
| CN111929026B (en) * | 2020-09-29 | 2020-12-15 | 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 |
| CN112197933B (en) * | 2020-12-10 | 2021-02-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Width-adjustable opening jet flow wind tunnel chamber and opening jet flow wind tunnel test method |
| CN112556968B (en) * | 2021-02-23 | 2021-05-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Three-quarter opening test section for acoustic wind tunnel test |
| CN218002870U (en) * | 2022-07-19 | 2022-12-09 | 上汽通用汽车有限公司 | Vortex generator, automobile wind tunnel test section nozzle assembly and wind tunnel parking chamber |
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- 2023-05-11 CN CN202310526161.3A patent/CN116242576B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067584A (en) * | 2007-06-14 | 2007-11-07 | 同济大学 | Opening back-flowing suppressing low-speed wind tunnel low-frequency buffeting ejector structure |
| CN107941450A (en) * | 2017-09-20 | 2018-04-20 | 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 spout angle eddy generator for suppressing the low frequency pulsation of opening jet stream wind-tunnel |
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| CN116242576A (en) | 2023-06-09 |
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