NL2031796A - Intensive wind tunnel structure with stratified variable wind speed - Google Patents
Intensive wind tunnel structure with stratified variable wind speed Download PDFInfo
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- NL2031796A NL2031796A NL2031796A NL2031796A NL2031796A NL 2031796 A NL2031796 A NL 2031796A NL 2031796 A NL2031796 A NL 2031796A NL 2031796 A NL2031796 A NL 2031796A NL 2031796 A NL2031796 A NL 2031796A
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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
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Abstract
The invention relates to the technical field of wind tunnel installation, and provides an ntensive wind tunnel structure with stratified variable wind speed, which comprises a power section, a diffusion section, a stabilization section, a contraction section and a test section which are sequentially connected; a plurality of fan filter units are arranged in the power section along the length direction, and the fan filter units comprise a plurality of fans which are distributed in an array along the radial direction; the fan is controlled by a controller; a ventilation pipe is arranged on the inner wall of the power section between two adjacent rows of the fan filter units, and the ventilation pipe is provided with a plurality of air ducts corresponding to a plurality of fans. The invention can manufacture incoming air with different characteristics in special test environment, with wider wind speed adjustment range and higher test data accuracy; and the whole structure is detachable, which is convenient to install in different test environments.
Description
Intensive wind tunnel structure with stratified variable wind speed
The invention relates to the technical field of wind tunnel installation, in particular to an intensive wind tunnel structure with stratified variable wind speed.
Wind tunnel is a kind of pipe - like experimental installation that artificially generates and controls air flow, which is mainly used to simulate the air flow around aircraft or entities and can measure the effect of entities on air flow and is used for aerodynamic research. Because natural observation is limited by many factors, such as time, wind velocity fluctuation, condition of underlying surface, etc., it is difficult to systematically and deeply study the aerodynamic situation of the research object. The application of wind tunnel can well solve these problems.
However, the existing wind tunnel has a large overall quality, and it is not convenient to disassemble and build during the test. In addition, a large fan is generally installed in the power section of the wind tunnel, which has the characteristics of single driving mode, high energy consumption, small wind speed adjustment range and single adjustment mode, and cannot meet diversified test requirements. Therefore, it is an urgent problem to design a wind tunnel structure with simple disassembly and assembly, which can meet the requirements of different characteristics and different ranges of wind speed and low energy consumption.
The invention provides an intensive wind tunnel structure with stratified variable wind speed, which can manufacture incoming wind with different characteristics in a special test environment, with wider wind speed adjustment range and higher test data accuracy. And the whole structure is detachable, which is convenient to install in different test environments.
The invention provides an intensive wind tunnel structure with stratified variable wind speed, which comprises a power section, a diffusion section, a stabilization section, a contraction section and a test section which are sequentially connected; a plurality of fan filter units are arranged in the power section along the length direction, and the fan filter units comprise a plurality of fans which are distributed in an array along the radial direction; the fan is controlled by a controller; a ventilation pipe is arranged on the inner wall of the power section between two adjacent rows of the fan filter units, and the ventilation pipe is provided with a plurality of air ducts corresponding to a plurality of fans.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, a filter screen is arranged in the power section, and the filter screen is arranged at the air inlet end of the fan filter unit.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, a first damping net, a honeycomb and a second damping net are sequentially arranged in the stabilization section at intervals along the length direction.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the spacing distances between the first damping net and the honeycomb and between the honeycomb and the second damping net are 50 - 100 cm respectively.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the honeycomb device comprises a plurality of regular hexagonal vent holes with circumscribed circle diameters of 10 - 30 mm.
According to an intensive wind tunnel structure stratified variable wind speed provided by the invention, the fan filter unit comprise two rows, and each row of the fan filter unit comprises fans distributed in three rows and three columns.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the wind tunnel structure is a detachable connection structure.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the test section comprises a plurality of test cabins which are detachably connected, the test cabins are surrounded by baffles, and the baffles at the bottom of the test cabins are detachable.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the wind tunnel structure also comprises an outlet diffusion section which is detachably connected with the test section.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, the bottom of the power section is provided with a height adjustment base, and the bottoms of the stabilization section, the contraction section, the test section and the outlet diffusion section are provided with support seats.
According to the intensive wind tunnel structure with stratified variable wind speed provided by the invention, by arranging the power section, the diffusion section, the stabilization section, the contraction section and the test section which are connected in sequence, the outdoor wind conditions can be well simulated, and the stratified steady laminar flow can be provided, thereby improving the accuracy of test data; in addition, the fans in the power section are arranged in multiple rows, columns and rows, and intensive wind speed regulation is realized by the controller, so that each fan can independently control the wind speed, and make different characteristics of incoming air in special test environment, so that the thickness of the boundary layer is larger and the range of wind speed regulation is wider in the test process; compared with the power section of the traditional wind tunnel using a single large fan, the invention sets a plurality of small fans according to the entrance of the wind tunnel, so that the single mass is lighter, and the overall energy consumption is lower under the same test conditions; in addition,
the whole wind tunnel adopts modular sectional detachable design, which does not need the assistance of large machinery during use, and is convenient for local disassembly and erection.
Additional aspects and advantages of the invention will be set forth in part in the description that follows, and in part will be obvious from the description that follows or may be learned by practice of the invention.
In order to more clearly explain the technical solutions of the present invention or related technologies, the following will briefly introduce the drawings used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present invention, and for ordinary technicians in the field, other drawings can be obtained according to these drawings without paying creative efforts.
Fig. 1 is one of the schematic structural diagrams of an intensive wind tunnel with stratified variable wind speed provided by the present invention;
Fig. 2 is a schematic structural diagram of the fan filter unit provided by the present invention;
Fig. 3 is a schematic view of the sectional structure of the ventilation pipe provided by the present invention;
Fig. 4 is a schematic structural diagram of a first damping net and a second damping net provided by the present invention;
Fig. 5 is a schematic structural diagram of the honeycomb provided by the present invention;
Fig. 6 is one of the schematic sectional structures of the test section provided by the present invention;
Fig. 7 is the second schematic diagram of the intensive wind tunnel with stratified variable wind speed provided by the present invention;
Fig. 8 is the second schematic diagram of the sectional structure of the test section provided by the present invention;
Reference number: 1: fan filter unit; 01: fan; 2: ventilation pipe; 21: air duct; 3: filter screen; 4: the first damping net; 5: honeycomb; 6: the second damping net; 7: test cabin; 8: baffle; 9: research object; 10: raise the base; 11: support seat;
I: power section; II: diffusion section; Ill: stable section; IV: contraction section;
V: test section; VI: outlet diffusion section
In order to make the purpose, technical scheme, and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described with reference to the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms “centre”, “longitudinal”, “lateral”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside” and so on, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed, and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention. In addition, the terms “first”, “second” and so on are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that the terms “linked” and “connected” should be understood broadly, for example, they can be fixed connection, detachable connection, or integrated connection. Can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in the field, the specific meanings of the above terms in the embodiments of the present invention can be understood in specific situations.
In the embodiments of the present invention, unless otherwise expressly specified and limited, the first feature "on" or "under" the second feature may be in direct contact with the first and second features, or the first and second features are indirectly contacted through an intermediary. Furthermore, the first feature “above”, “up” and “over” the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicate that the first feature is higher in horizontal height than the second feature. The first feature “below”, “down”, “underneath” the second feature, below and below can mean that the first feature is directly below the second feature or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.
In the description of this specification, referring to the description of the terms “one embodiment”, “some embodiments”, “examples”, “concrete examples” or “some examples” means that the specific features, structures, materials, or characteristics described in connection with this embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples.
Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and bond different embodiments or examples described in this specification and the features of different embodiments or examples without contradicting each other.
Next, the intensive wind tunnel structure with stratified variable wind speed of the present invention will be described with reference to the attached drawings. Among them, “multiple 5 rows, multiple” mentioned in this article can be understood as at least two rows and at least two.
According to the embodiment of the present invention, as shown in Figure 1 - 8, the intensive wind tunnel structure with stratified variable wind speed provided by the present invention mainly includes a power section |, a diffusion section Il, a stabilization section III, a contraction section IV and a test section V which are connected in sequence. Among them, in the power section |, there are multiple fan filter units 1 along the length direction, which include multiple fans 101 distributed in an array along the radial direction, which can provide incoming air flows with different wind speeds according to the test requirements, that is, the power section is used to generate flowing air flows, the diffusion section II is used to integrate multiple air flows generated by multiple fans 101 in the power section |, the stabilization section Ill is used to stabilize the integrated air flows and provide stratified steady laminar flow, and the contraction section IV is used to improve the air flow rate, it is convenient to quickly enter the test section V to improve the test efficiency. The test section V is used to place the research object 9 for experimental research. The wind tunnel structure of the invention can well simulate the outdoor wind conditions by arranging the plurality of working sections, and provide the stratified steady laminar flow, thereby improving the accuracy of test data.
The wind tunnel structure also includes a controller (not shown in the figure). The multi fan filter units 1 are connected with a controller. The controller can independently control one fan 101 or uniformly control the fan filter unit 1, that is, the controller is connected with each fan 101 of the fan filter unit 1. Through the controller, a plurality of fans 101 can be independently or uniformly controlled centrally, so as to realize intensive unified management and control.
The wind tunnel structure also includes ventilation pipes 2, which are arranged on the inner wall of the power section | and between two adjacent fan filter units 1. The ventilation pipes 2 are provided with a plurality of air ducts 201 corresponding to a plurality of fans 101, that is to say, the air ducts 201 of the ventilation pipes 2 are arranged in one - to - one correspondence with the number of fans 101 and are also distributed in an array. According to the invention, two rows of fans 101 adjacent to each other are connected through the ventilation pipes 2, so that it is convenient to separate and guide the airflow generated by different fans 101, so as to avoid the mutual influence of airflow with different wind speeds, so that the incoming airflow meeting the test conditions can be accurately manufactured, and the test accuracy can be effectively improved.
Therefore, in the intensive wind tunnel structure with stratified variable wind speed provided by the embodiment of the invention, by setting the power section |, the diffusion section Il, the stabilization section Ill, the contraction section IV and the test section V which are connected in sequence, the outdoor wind conditions can be well simulated, and the stratified steady laminar flow can be provided, thereby improving the accuracy of test data; in addition, the fans 101 of the power section | adopt the multi - row and multi - column layout, and the intensive wind speed regulation is realized by the controller. Each fan 101 can independently control the wind speed to produce different characteristics of incoming air in the special test environment, so that the thickness of the boundary layer is larger, and the wind speed regulation range is wider in the test process. Compared with the traditional wind tunnel using a single large - scale fan as the power section, the wind tunnel is divided into a plurality of small - scale fans 101 according to the wind tunnel entrance, so that the individual weight is lighter, and the overall energy consumption is lower under the same test conditions.
According to the embodiment of the present invention, as shown in fig. 1, the power section , the stabilization section Ill and the test section V have constant cross - sectional areas and generally square cross - sectional shapes, the cross - sectional areas of the diffusion section II gradually increase along the wind direction, and the cross - sectional areas of the contraction section IV gradually decrease along the wind direction, and the cross - sectional shapes can be as shown in the figure, specifically, the upper side of the contraction section IV is tapered while the lower side is constant, so that it is convenient to install on the support base 11.
According to the embodiment of the present invention, as shown in Figure 1, a filter screen 3 is arranged in the power section |, and the filter screen 3 is arranged at the air inlet end (front end) of the fan filter unit 1, which is mainly used for filtering the impurities in the air flow and preventing the impurities from entering the wind tunnel structure. On the one hand, it can protect a plurality of fans 101 of the fan filter unit 1 and prevent the impurities from getting caught in the fans 101 and causing damage. On the other hand, it can improve the uniformity of air flow into the wind tunnel structure, and further improve the accuracy of the test.
According to the embodiment of the present invention, as shown in fig. 1, the inner wall of the stabilization section Ill is provided with a first damping net 4, a honeycomb 5 and a second damping net 6 at intervals in sequence along the length direction. Among them, the first damping net 4 is mainly used to reduce the unevenness and turbulence of air flow, and it can also play the role of secondary filtering and protecting the honeycomb 5 to prevent the honeycomb 5 from being damaged. Honeycomb 5 has a certain thickness, which is mainly used for rectifying and straightening the airflow passing through first damping net 4 to make it smooth and stable; the second damping net 6 is mainly used to further stabilize the airflow, reduce the unevenness and turbulence of airflow, and protect the honeycomb 5 at the same time.
Therefore, the invention can effectively improve the smoothness and stability of air flow by sequentially arranging the first damping net 4, the honeycomb 5 and the second damping net 6.
According to an embodiment of the present invention, as shown in fig. 4, the first damping net 4 and the second damping net 6 have the same structure, both of which include a frame and a barbed wire arranged on the frame, the frame is arranged on the inner wall of the stabilization section Ill, and the barbed wire has a plurality of ventilation holes.
In the actual test condition, when the interval between the first damping net 4, the honeycomb 5 and the second damping net 6 is set too large, the current stabilizing effect of the first damping net 4, the honeycomb 5 and the second damping net 8 is relatively poor, or even ineffective, resulting in the disorder of incoming flow and large error of test results; when the distance between the first damping net 4, the honeycomb 5 and the second damping net 6 is set too small, the first damping net 4 and the second damping net 6 on both sides can't function, only the honeycomb 5 can function. Similarly, the flow stabilizing effect is poor, which leads to chaotic incoming flow and large error of test results. According to the invention, by setting the interval distances between the first damping net 4 and the honeycomb 5 and between the honeycomb 5 and the second damping net 6 to 50 - 100 cm respectively, the first damping net 4, the honeycomb 5 and the second damping net 6 can all play a good step - by - step rectification effect, effectively increase the smoothness and stability of incoming flow, and further improve the test accuracy.
According to the embodiment of the present invention, as shown in Figure 5, the honeycomb 5 includes a frame and a ventilation net. The frame is arranged on the inner wall of the stabilization section III. The ventilation net is provided with a plurality of regular hexagonal ventilation holes with circumscribed circle diameters of 10 - 30 mm, which is convenient for rectification. The smaller the ventilation holes, the better the rectification effect, but the higher the manufacturing process requirements, the greater the wind resistance.
According to the embodiment of the present invention, the thickness of the honeycomb 5 is 10 - 15cm, correspondingly, the regular hexagonal ventilation holes become ventilation channels with a certain length, and when the incoming flow passes through the honeycomb 5, rectification can be carried out in the ventilation channels for a certain period of time to further improve the rectification effect. The longer the length of the honeycomb 5, that is, the thicker the honeycomb 5, the better the rectification and diversion effect, but the greater the wind energy attenuation.
According to the embodiment of the present invention, the first damping net 4, the honeycomb 5 and the second damping net 6 can be installed at different positions of the wind tunnel structural stabilization section Ill according to actual working conditions.
In one embodiment of the present invention, as shown in Figure 1 and Figure 2, the fan filter units 1 include two rows, and each fan filter unit 1 includes fans 101 distributed in three rows and three columns, which can respectively adjust the wind speed and increase the thickness of the boundary layer. Specifically, from the original 1m high wind tunnel with only 15cm boundary layer thickness, to 90cm high wind tunnel with 25cm boundary layer thickness, that is, the invention can effectively increase the boundary layer thickness on the premise of reducing the height of the wind tunnel.
Accordingly, as shown in fig. 3, the air ducts 201 of the ventilation pipe 2 can be arranged in the same way as the fans 101 according to the use needs, and the arrangement of rows and columns is adopted, that is, the ventilation pipe 2 is provided with square air ducts 201 arranged in three rows and three columns.
According to the embodiment of the invention, the whole wind tunnel structure is a detachable connection structure, that is, all the working sections of the wind tunnel structure are detachably connected, and the modular sectional detachable design is adopted, so that the use process does not need the assistance of large machinery, and it is convenient to assemble, disassemble and build on the spot in different test environments.
It should be understood that in the related technology, the wind tunnel structure is an integral structure, and when a certain working section of the wind tunnel is damaged, the whole wind tunnel cannot be used; however, by arranging the detachable multi - section structure, when a certain working section is damaged, only the section needs to be replaced, and the whole wind tunnel structure can be reused for a long time, thus saving the cost.
According to the embodiment of the present invention, as shown in fig. 1 and fig. 6, the test section V includes a plurality of test cabins 7 which are detachably connected, and the test cabins 7 are surrounded by baffles 8, and the baffles 8 at the bottom of the test cabins 7 are detachable, and the baffles 8 can be disassembled according to indoor or outdoor use requirements. For example, the test cabin 7 with the bottom baffle 8 removed can be directly covered on the field research object 9 to ensure the integrity of the research object 9, as shown in Figure 8.
According to an embodiment of the present invention, as shown in Figure 1, the wind tunnel structure of the present invention further comprises an outlet diffusion section VI which is detachably connected with the test section V, and the air flow after the test is discharged through the outlet diffusion section VI. The cross - sectional area of the outlet diffusion section
VI gradually increases along the wind direction, and the cross - sectional shape can be as shown in the figure. Specifically, the upper side of the outlet diffusion section VI is gradually expanded, while the lower side is constant, which is convenient to install on the support seat 11.
According to the embodiment of the invention, the bottom of the power section | is provided with a height adjustment base 10, which can adjust the height position of the power section according to the use and installation requirements, so as to avoid influencing the installation of the diffusion section Il; the bottoms of the stabilization section III, the contraction section IV, the test section V and the outlet diffusion section VI are detachably provided with supporting seats 11. It can be understood that there can be one supporting seat 11 to support the above - mentioned working sections correspondingly or supporting seats 11 can be respectively provided at the bottoms of the above - mentioned corresponding working sections, which can be specifically designed according to actual working conditions. As shown in fig. 1, when the wind tunnel structure is used in indoor environment, support seats 11 are arranged at the bottom of each corresponding working section, and the whole wind tunnel structure can be assembled conveniently by adjusting the height adjustment seat 10 of the power section |; as shown in fig. 7, when the wind tunnel structure is used in the field environment, the support seat 11 can be removed, and the power section | can be supported by adjusting the height adjustment base 10 of the power section |, so that the diffusion section Il and other working sections can be located on the ground, which is convenient to complete the assembly of the wind tunnel structure without affecting the research object 9.
The working principle of the intensive wind tunnel structure with stratified variable wind speed provided by the invention is described below, which mainly includes indoor and outdoor test environments.
Indoor test: as shown in Figure 1, in this embodiment, when the wind tunnel structure is used in indoor environment, the whole wind tunnel structure is installed and placed on the height adjustment base 10 and the support base 11. The outside air is filtered by the filter screen 3 at the front end of the power section | at first, and then enters the front fan filter unit 1, which is accelerated by the front fan filter unit 1, and the accelerated airflow is sent to the rear fan filter unit 1 through the ventilation pipe 2 connected with it for secondary acceleration. The multi - beam airflow is integrated through the diffusion section Il, and then passes through the first damping net 4, the honeycomb 5 and the second damping net 6 of the stabilization section [Il in order to increase the smoothness and stability of the incoming airflow, and then quickly enters the test section V through the compression section IV. During the test, the cross - sectional structure of the test section V is shown in Figure 6, the test object 9 is fixed on the baffle 8 at the bottom of the test cabin 7, and the test is carried out in the test section V, and the airflow is finally discharged from the outlet diffusion section VI.
During the test process, it is possible to adjust different fans 101 in different rows and columns individually or integrally, so as to meet the requirements of different characteristics of incoming air in the test environment.
Field test: as shown in Figure 7, this embodiment moves the whole wind tunnel structure to the field for test on the basis of the above embodiment. Before the test, the baffle 8 at the bottom of the test cabin 7 of test section V needs to be removed, so that the research object 9 can be placed in the test cabin 7 of test section V without being affected, as shown in Figure 8.
According to the test requirements, increase or decrease the number of test cabins 7 in test section V to meet the requirements of different test lengths, and assemble different working sections of the wind tunnel structure in turn. By adjusting the height adjustment base 10 of the power section |, other different working sections can be located on the ground, thus completing the overall construction of the field wind tunnel structure.
During the test, the external power supply drives the fan 101 to rotate, and the field wind tunnel test is carried out. After the test is completed, each working section is disassembled and separated in turn, so as to prepare for the next field wind tunnel test.
To sum up, the intensive wind tunnel structure with stratified variable wind speed provided by the invention can well imitate the outdoor wind conditions and provide stratified steady laminar flow, thus improving the accuracy of test data; and can manufacture incoming air with different characteristics in special test environment. During the test, the thickness of boundary layer is larger, the wind speed adjustment range is wider, and the overall energy consumption is lower. In addition, the wind tunnel as a whole adopts modular sectional detachable design, which is convenient for local disassembly and erection and adapts to different test environments.
Finally, it should be noted that the above embodiments are only used to illustrate the technical scheme of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical schemes described in the foregoing embodiments, or equivalently replace some of its technical features; however, these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111501567.3A CN114279672A (en) | 2021-12-09 | 2021-12-09 | Intensive wind tunnel structure capable of changing wind speed in layering manner |
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| NL2031796A true NL2031796A (en) | 2023-06-26 |
| NL2031796B1 NL2031796B1 (en) | 2023-12-08 |
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| CN117782509B (en) * | 2024-02-27 | 2024-04-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Fixing assembly of icing wind tunnel replaceable test device |
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| CN114279672A (en) | 2022-04-05 |
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