CN114894426B - Shear flow generation system with adjustable shear rate and shear flow adjusting method - Google Patents
Shear flow generation system with adjustable shear rate and shear flow adjusting method Download PDFInfo
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- CN114894426B CN114894426B CN202210817921.1A CN202210817921A CN114894426B CN 114894426 B CN114894426 B CN 114894426B CN 202210817921 A CN202210817921 A CN 202210817921A CN 114894426 B CN114894426 B CN 114894426B
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- 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
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a shear flow generation system with adjustable shear rate and a shear flow adjusting method, belonging to the technical field of wind tunnels. The shear flow adjusting method applies the shear flow generating system with adjustable shear rate. The invention can realize the adjustment of the target shear rate of the shear flow by inserting the air inlet adjusting partition plates into the partition plate slots with different heights, has low technical difficulty of adjustment, safety and stability, simple and convenient adjustment, more applicable scenes, no other side effects and lower cost.
Description
Technical Field
The invention belongs to the technical field of wind tunnels, and particularly relates to a shear flow generation system with adjustable shear rate and a shear flow adjusting method.
Background
In wind tunnel experiments in the field of civil engineering wind engineering, different landform wind fields are often required to be simulated, and aerodynamic force of shear flow on devices is also required to be simulated in wind tunnel experiments in the field of aerospace; the characteristic of this kind of air current is that the wind speed of air current on different heights is different, namely there is shear between the flow layer, the wind tunnel experiment should simulate out the incoming flow wind of different shear rates.
Most of the existing boundary layer wind tunnels adopt wedges and rough elements to generate a boundary layer velocity profile with the velocity and the turbulence degree changing along with the height. However, this method has the disadvantages that wind profiles with different landforms (or shear rates) need to be adjusted by adjusting the combination of the wedge and the size and position of the rough element, the adjustment is time-consuming and labor-consuming, the turbulence decays too fast in the height direction, and the experiment is distorted after being separated from the bottom of the wind tunnel by a certain distance. In addition, the adjusting method has defects in medium and small-scale wind field simulation such as local wind speed deflection.
CN105890865B discloses a wedge-rough-cell combination system, which comprises a rotatable flat plate and a wedge. The three layers of rotating flat plates adjust the upstream air intake to obtain a substantially linear velocity profile, and the wind profile, the turbulence and the like are further adjusted through the wedge combination. The method can overcome the defect that the wedge and the rough element are adjusted to be too fast in turbulence attenuation, but the rotating flat plate can bring about the influence on the levelness of the airflow, and the airflow needs a certain distance to recover the level, which has higher requirements on the length of the wind tunnel; in addition, the wind profile is adjusted by rotating the flat plate, and the adjusting capability is limited.
CN112504606A discloses a method for obtaining a wind profile with adjustable wind deflection angle by using array fan deflection. CN112504607A discloses a continuous torsion deflector system, which obtains a wind profile with continuously adjustable wind deflection angle by deflector torsion. Both systems can obtain a wind profile with a wind drift angle, and can meet the simulation of some special wind fields.
CN107436220A discloses a return flow type variable frequency speed regulation fan array wind tunnel, which can meet the purpose of wind profile regulation through a frequency regulation fan. CN110082058A discloses a wind tunnel for obtaining extreme wind environment by using reasonable arrangement of variable frequency speed-regulating fan array, which can simulate tornado, downburst storm and other wind fields.
The prior art has the following problems in obtaining a special wind profile: 1. passive control techniques have limited regulatory capabilities and may bring about other side effects; 2. the active analog control technology is complex, the cost is high, and the popularization is difficult; 3. the technical function is single, and the multi-scene use requirement is difficult to meet.
Disclosure of Invention
The invention aims to provide a shear flow generation system with an adjustable shear rate and a shear flow adjusting method, so as to solve the technical problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the shear flow generating system with the adjustable shear rate comprises a power section, an air intake adjusting section, a contraction adjusting section and a rear stabilizing section, wherein the power section is used for supplying air; the front end of the air inlet quantity adjusting section is connected with the power section, a plurality of groups of partition plate slots positioned on different flow layers and air inlet adjusting partition plates capable of being inserted into the partition plate slots are arranged in the air inlet quantity adjusting section, and the air inlet adjusting partition plates divide the interior of the air inlet quantity adjusting section into different cavities; the front end of the contraction adjusting section is connected with the rear end of the air inlet amount adjusting section, a contraction adjusting partition plate assembly is arranged in the contraction adjusting section, the front end of the contraction adjusting partition plate assembly is connected with the air inlet adjusting partition plate, two sides of the contraction adjusting partition plate assembly are in sealing fit with the inner walls of two sides of the contraction adjusting section, the contraction adjusting partition plate assembly is used for partitioning the interior of the contraction adjusting section into different cavities and holes, and the contraction adjusting partition plate assembly has the freedom degree of stretching along the length direction so as to be still in a straight state when the air inlet adjusting partition plate is inserted into partition plate slots with different heights; the front end of the rear stabilizing section is connected with the rear end of the contraction adjusting section, a wind stabilizing partition plate is arranged inside the rear stabilizing section, and the front end of the wind stabilizing partition plate is connected with the rear end of the contraction adjusting partition plate assembly and used for stabilizing airflow and then forming shear flow with a target shear rate behind the rear stabilizing section.
In one possible implementation mode, the front end of the contraction adjusting partition plate assembly is in rotating and sealing connection or lap joint and sealing connection with the air inlet adjusting partition plate; the rear end of the contraction adjusting partition plate assembly is in rotary sealing connection or lap joint and sealing connection with the air stabilizing partition plate; a plurality of partition plate slots are formed in the two side faces of the air inlet quantity adjusting section from top to bottom, and the two sides of the air inlet quantity adjusting partition plates are inserted into the partition plate slots on one side of the air inlet quantity adjusting section; and sealing strips which are abutted against the inner wall of the contraction adjusting section are arranged on two sides of the contraction adjusting partition plate assembly.
In one possible implementation, the air inlet adjusting partition plates are in a plurality of groups, the contraction adjusting partition plate assemblies are also in a plurality of groups in one-to-one correspondence with the air inlet adjusting partition plates, and the air stabilizing partition plates are also in a plurality of groups in one-to-one correspondence with the contraction adjusting partition plate assemblies.
In one possible implementation mode, the contraction adjusting partition plate assembly comprises a front partition plate, a rear partition plate and an expansion joint structure, wherein the front partition plate is of a plate-shaped structure, and the front end of the front partition plate is connected with the air inlet adjusting partition plate; the rear partition board is of a plate-shaped structure, and the rear end of the rear partition board is connected with the air stabilizing partition board; the telescopic joint structure is respectively connected with the front partition plate and the rear partition plate, so that the front partition plate and the rear partition plate can be staggered back and forth.
In one possible implementation, the telescopic joint structure is a sliding rail structure, an elastic telescopic structure or a sliding sleeve structure.
In one possible implementation mode, the rear end of the front partition plate and the front end of the rear partition plate are mutually overlapped, and the telescopic joint structure is positioned between the rear end of the front partition plate and the front end of the rear partition plate; the telescopic joint structure comprises a sliding rail and a sliding block, the sliding rail is arranged at the rear end of the front partition plate, the sliding block is arranged at the front end of the rear partition plate, and the sliding rail and the sliding block are in sliding fit, so that relative sliding can be generated between the rear end of the front partition plate and the front end of the rear partition plate.
In a possible implementation mode, the front end of the rear partition board is at least provided with a front slide block and a rear slide block, and the two slide blocks are in sliding fit with the same slide rail; a plurality of groups of telescopic joint structures are arranged between the rear end of the front partition plate and the front end of the rear partition plate, and the sliding rails of the telescopic joint structures of each group are arranged in parallel.
In one possible implementation manner, the contraction adjusting partition plate assembly further comprises a fixing piece, and the fixing piece is used for fixing the rear end of the front partition plate and the front end of the rear partition plate; the outside of telescopic joint structure still is equipped with outer parcel layer, and outer parcel layer wraps up in preceding baffle rear end and back baffle front end to seal the space between preceding baffle and the back baffle.
In a possible implementation mode, a front stabilizing section is arranged between the power section and the air inlet quantity adjusting section and is used for stabilizing wind power; a large-size fan or a small fan array is arranged in the power section to provide wind power; a honeycomb device and a damping net are arranged in the front stabilizing section to eliminate the disorder of the straight air flow and obtain a straight air flow; a damping gauze component is arranged in the rear stable section so as to reduce the shear instability of each layer of airflow; the damping gauze component comprises a plurality of layers of damping gauze, and the mesh density of different parts of the damping gauze is positively correlated with the target shear rate of the corresponding shear flow of the part; the outlet of the rear stabilizing section is provided with a grid to adjust the turbulence degree; the power section, the front stabilizing section, the air inlet quantity adjusting section, the contraction adjusting section and the rear stabilizing section are connected through flanges.
In order to achieve the purpose, the invention adopts the technical scheme that: the shear flow adjusting method is applied to the shear flow generating system with the adjustable shear rate, and comprises the following steps:
A. inserting an air inlet adjusting partition plate into one group of partition plate slots according to the target shear rate of the shear flow, and keeping a contraction adjusting partition plate assembly in a straight state to form the shear flow at an outlet of a rear stable section;
B. detecting whether the shear flow at the outlet of the rear stable section meets the target shear rate; and if not, repeating the step A, wherein the air inlet adjusting partition plate needs to be inserted into another group of partition plate slots to obtain different shear flows until the shear flow meeting the target shear rate is obtained.
The shear flow generation system with the adjustable shear rate has the beneficial effects that: compared with the prior art, the air inlet quantity adjusting section has the advantages that through the matching of the partition board slots in the air inlet quantity adjusting section and the air inlet adjusting partition boards, the interior of the air inlet quantity adjusting section can be divided into cavities with different sectional areas, the air inlet quantities of different cavities are different, then the interior of the contraction adjusting partition board assembly is divided into different cavities through the contraction adjusting partition board assembly in the contraction adjusting section, the air entering the air inlet quantity adjusting section is guided and contracted continuously, and then the parameters such as the air direction of air flow are stabilized through the air stabilizing partition board of the rear stabilizing section, so that the shear flow with the target shear rate can be formed behind the rear stabilizing section; the target shear rate of the shear flow can be realized by inserting the air inlet adjusting partition plates into the partition plate slots of different flow layers, so that the overall structure is simple, the adjusting technology is low in difficulty, safe and stable, the adjustment is simple and convenient, the disassembly and assembly are convenient and easy to move, the applicable scenes are more, no other side effects exist, and the cost is lower.
The shear flow adjusting method provided by the invention has the beneficial effects that: compared with the prior art, the shear flow generation system with the adjustable shear rate is applied, the adjustment of the target shear rate of the shear flow can be realized by inserting the air inlet adjusting partition plates into the partition plate slots of different flow layers, the adjustment technology is low in difficulty, safe and stable, simple and convenient to adjust, capable of being applied to a plurality of scenes, free of other side effects and low in cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a shear flow generation system with adjustable shear rate according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a side inner wall portion of an air intake adjusting section of a shear flow generation system with an adjustable shear rate according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structural view of a telescopic joint portion of a shear flow generation system with an adjustable shear rate according to an embodiment of the present invention.
Wherein, each reference number in the figures is as follows:
10. a power section;
20. a front stabilizing section;
30. an air intake adjusting section; 31. a partition plate slot; 32. an air inlet adjusting partition plate;
40. a contraction regulation section; 41. a contraction adjustment baffle assembly; 411. a front partition plate; 412. a rear bulkhead;
413. a slide rail; 414. a slider; 415. an outer wrapping layer; 416. a fixing member;
50. a rear stabilization section; 51. a wind stabilizing partition plate; 52. a damping screen assembly;
60. shear flow indicates lines.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be further understood that the drawings and embodiments of the present invention mainly describe the concept of the present invention, and on the basis of the concept, the specific forms and arrangements of some connection relationships, position relationships, power mechanisms, power supply systems, hydraulic systems, control systems, etc. may not be completely described, but those skilled in the art can implement the specific forms and arrangements in a known manner on the premise that those skilled in the art understand the concept of the present invention.
When an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
The shear flow generation system with adjustable shear rate and the shear flow adjustment method provided by the invention are explained.
Referring to fig. 1, a shear flow generating system with adjustable shear rate according to a first embodiment of the present invention includes a power section 10, an intake air adjusting section 30, a contraction adjusting section 40, and a rear stabilizing section 50, wherein the power section 10 is used for supplying air; the front end of the air intake adjusting section 30 is connected with the power section 10, and is internally provided with a plurality of groups of partition slots 31 positioned on different flow layers and air intake adjusting partition plates 32 capable of being inserted into the partition slots 31, and the air intake adjusting partition plates 32 divide the interior of the air intake adjusting section 30 into different cavities; the front end of the contraction adjusting section 40 is connected with the rear end of the intake adjusting section 30, a contraction adjusting partition plate assembly 41 is arranged in the contraction adjusting section, the front end of the contraction adjusting partition plate assembly 41 is connected with the intake adjusting partition plate 32, two sides of the contraction adjusting partition plate assembly are in sealing fit with the inner walls of two sides of the contraction adjusting section 40, the contraction adjusting partition plate assembly 41 is used for partitioning the interior of the contraction adjusting section into different cavities, and the contraction adjusting partition plate assembly 41 has the freedom of expansion along the length direction so that the intake adjusting partition plate 32 can still be in a straight state when inserted into the partition plate inserting grooves 31 of different flow layers; the front end of the rear stabilizing section 50 is connected with the rear end of the contraction adjusting section 40, a wind stabilizing partition plate 51 is arranged inside the rear stabilizing section, the front end of the wind stabilizing partition plate 51 is connected with the rear end of the contraction adjusting partition plate assembly 41, and the wind stabilizing partition plate is used for stabilizing airflow and then forming shear flow with a target shear rate behind the rear stabilizing section 50. The different flow layers refer to different positions in the wind tunnel, and can be different in height or different in left and right positions.
Compared with the prior art, the shear flow generation system with adjustable shear rate provided by this embodiment can divide the inside of the intake rate adjusting section 30 into cavities with different cross-sectional areas through the matching of the partition slot 31 in the intake rate adjusting section 30 and the intake adjusting partition 32, the intake rates of the different cavities are different, then the inside of the contraction adjusting partition assembly 41 is divided into different cavities through the contraction adjusting partition assembly 41 in the contraction adjusting section 40, and then the air entering the intake rate adjusting section 30 is guided and contracted continuously, and then the air direction and other parameters of the air flow are stabilized through the air stabilizing partition 51 of the rear stabilizing section 50, so that the shear flow with the target shear rate can be formed after the rear stabilizing section 50; because the target shear rate of the shear flow can be realized by inserting the air inlet adjusting partition plate 32 into the partition plate slots 31 of different flow layers, the overall structure is simple, the adjusting technical difficulty is low, the device is safe and stable, the adjustment is simple and convenient, the device is convenient to disassemble and assemble and easy to move, the applicable scenes are more, no other side effect exists, and the cost is lower.
Referring to fig. 1 and fig. 2, a first embodiment of the present invention is as follows:
the front end of the contraction adjusting partition plate assembly 41 is connected with the air inlet adjusting partition plate 32 in a rotating and sealing manner or in an overlapping and sealing manner, so as to avoid air leakage.
The rear end of the contraction adjusting partition plate assembly 41 is in rotary sealing connection or lap joint and sealing connection with the air stabilizing partition plate 51 to avoid air leakage.
A plurality of baffle slots 31 are respectively arranged on the two side surfaces of the air intake adjusting section 30 from top to bottom, and the two sides of the air intake adjusting baffle 32 are respectively inserted into the baffle slots 31 positioned on one side of the air intake adjusting section 30.
The two sides of the contraction adjusting partition plate assembly 41 are provided with sealing strips which are abutted against the inner wall of the contraction adjusting section 40 so as to avoid air leakage.
Preferably, the sealing strip is of chevron-shaped cross-section, i.e. one side is connected to the edge of the contraction regulating partition plate assembly 41, and the other side is provided with a skirt extending upward and downward and abutting against the inner wall of the contraction regulating section 40, respectively, so as to block the upward or downward gas flow.
The air inlet adjusting partition plates 32 are in a plurality of groups, the contraction adjusting partition plate assemblies 41 are also in a plurality of groups corresponding to the air inlet adjusting partition plates 32 one by one, and the air stabilizing partition plates 51 are also in a plurality of groups corresponding to the contraction adjusting partition plate assemblies 41 one by one.
The air flow in the wind tunnel can be divided into a plurality of layers by the air inlet adjusting partition plates 32, the contraction adjusting partition plate assemblies 41 and the air stabilizing partition plates 51, and the outlet air speed can be adjusted by adjusting the inlet-outlet proportion of each layer, namely the position of the air inlet adjusting partition plates 32, so that the wind profile with the required shear rate is obtained.
Referring to fig. 1 to fig. 3, a first embodiment of the present invention is further provided as follows:
the contraction regulation partition plate assembly 41 comprises a front partition plate 411, a rear partition plate 412 and an expansion joint structure, wherein the front partition plate 411 is of a plate-shaped structure, and the front end of the front partition plate is connected with the air inlet regulation partition plate 32; the rear partition 412 is of a plate-shaped structure, and the rear end of the rear partition is connected with the wind stabilizing partition 51; the telescopic joint structure is respectively connected with the front partition 411 and the rear partition 412, so that the front partition 411 and the rear partition 412 can be staggered back and forth. The angle and spacing of the stabilizing partitions 51 are set as desired.
The telescopic joint structure is one or more of a slide rail structure, an elastic telescopic structure or a sliding sleeve structure and the like which can be telescopic.
Specifically, the rear end of the front partition 411 and the front end of the rear partition 412 are overlapped, and the telescopic joint structure is located between the rear end of the front partition 411 and the front end of the rear partition 412; the telescopic joint structure comprises a sliding rail 413 and a sliding block 414, wherein the sliding rail 413 is arranged at the rear end of the front partition 411, the sliding block 414 is arranged at the front end of the rear partition 412, and the sliding rail 413 and the sliding block 414 are in sliding fit, so that the rear end of the front partition 411 and the front end of the rear partition 412 can slide relatively.
Preferably, at least two sliding blocks 414 arranged in front and back are arranged at the front end of the back partition plate 412, and the two sliding blocks 414 are in sliding fit with the same sliding rail 413, so that the straightness between the front partition plate 411 and the back partition plate 412 is ensured, and the situation of middle collapse is avoided; a plurality of groups of telescopic joint structures are arranged between the rear end of the front partition 411 and the front end of the rear partition 412, and the sliding rails 413 of the telescopic joint structures of each group are arranged in parallel.
The contraction adjusting diaphragm assembly 41 further comprises a fixing member 416, and the fixing member 416 is used for fixing the rear end of the front diaphragm 411 and the front end of the rear diaphragm 412 so as to provide vertical supporting force and avoid the situation of middle collapse.
Expansion joint structure outside still is equipped with outer parcel layer 415, and outer parcel layer 415 parcel is at baffle 411 rear end and back baffle 412 front end in the front to seal the space between baffle 411 and the back baffle 412 before, in order to play certain sealed effect, avoid forming great windage, the connection between baffle 411 and the back baffle 412 is fixed before can strengthening simultaneously, in order to provide vertical holding power, avoids producing the condition that the middle part sinks.
Furthermore, the fixture 416 may also be an electronically controlled fastening module to facilitate external control.
A front stabilizing section 20 is arranged between the power section 10 and the intake adjusting section 30, and the front stabilizing section 20 is used for stabilizing wind power.
A large scale fan or an array of small fans is provided within the power section 10 to provide wind power. The two power modes can be arranged in the wind tunnel, the large fan can only adjust the wind speed, the small fan array can set different wind speeds at different heights, a primary speed distribution profile which changes along the height is formed, the wind speed profile of the small fan array is controlled more flexibly, and the cost and the control difficulty of the large fan are lower.
Because the wind blown by the fan rotates, a honeycomb device and a damping net can be arranged in the front stabilizing section 20 to eliminate the disorder of the straight air flow, so that the air flow is smoother and has lower turbulence degree, and the straight air flow is obtained.
A damping gauze component is arranged in the rear stable section 50 to reduce the shear instability of airflow of each layer; the damping gauze component comprises a plurality of layers of damping gauzes, and the mesh density of different parts of the damping gauze is positively correlated with the target shear rate of the shear flow corresponding to the parts.
Specifically, the damping gauze component uses gauzes with different densities along the height direction, and the combination of different gauze meshes (densities) can be adopted according to different required shearing rates, and also a plurality of layers of combined gauzes can be selected. The airflow shear in different partitions flowing from the rear stable section 50 plays a better role in stable mixing transition, and the shear instability of each layer of airflow is reduced. For example, the mesh of the gauze may be larger at the lower part and smaller at the upper part, or larger at the middle part and smaller at the upper part and the lower part.
The outlet of the rear stabilizing section 50 is provided with a grating to adjust the turbulence level. The grid looks like a grid frame, and different turbulence degrees are generated by adjusting the thickness of the frame and the size of the grid. This configuration can be used if the test requires turbulence.
The power section 10, the front stabilizing section 20, the intake adjusting section 30, the contraction adjusting section 40 and the rear stabilizing section 50 are connected through flanges.
The shear flow adjusting method provided by the second embodiment of the invention, which applies the shear flow generating system with adjustable shear rate, comprises the following steps:
A. according to the target shear rate of the shear flow, inserting the air inlet adjusting partition plate 32 into one group of partition plate slots 31, and keeping the contraction adjusting partition plate assembly 41 in a straight state, so that the shear flow is formed at the outlet of the rear stable section 50;
B. detecting whether the shear flow at the outlet of the rear stable section 50 meets the target shear rate; if not, repeating the step A, wherein the air inlet adjusting partition plate 32 needs to be inserted into another group of partition plate slots 31 to obtain different shear flows until the shear flows meeting the target shear rate are obtained; if the result is satisfied, the next stage of operation is performed, such as wind tunnel test.
Compared with the prior art, the shear flow adjusting method provided by the embodiment has the advantages that by applying the shear flow generating system with the adjustable shear rate, the adjustment of the target shear rate of the shear flow can be realized by inserting the air inlet adjusting partition plate 32 into the partition plate slots 31 with different heights, the adjusting technical difficulty is low, the method is safe and stable, the adjustment is simple and convenient, a plurality of applicable scenes are available, other side effects are avoided, and the cost is low.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A shear-rate adjustable shear-flow generating system, comprising:
a power section (10) for supplying air;
the front end of the air inlet quantity adjusting section (30) is connected with the power section (10), a plurality of groups of partition plate slots (31) which are positioned at different heights and air inlet adjusting partition plates (32) which can be inserted into the partition plate slots (31) are arranged in the air inlet quantity adjusting section, and the air inlet adjusting partition plates (32) divide the interior of the air inlet quantity adjusting section (30) into different cavities;
the front end of the contraction adjusting section (40) is connected with the rear end of the air inlet amount adjusting section (30), a contraction adjusting partition plate assembly (41) is arranged in the contraction adjusting section, the front end of the contraction adjusting partition plate assembly (41) is connected with the air inlet adjusting partition plate (32), two sides of the contraction adjusting partition plate assembly are in sealing fit with the inner walls of two sides of the contraction adjusting section (40), the contraction adjusting partition plate assembly (41) is used for partitioning the interior of the contraction adjusting section (40) into different cavities, and the contraction adjusting partition plate assembly (41) has the degree of freedom of stretching along the length direction so that the air inlet adjusting partition plate (32) can still be in a straight state when inserted into partition plate inserting grooves (31) of different flow layers;
back stable section (50), the front end with shrink regulation section (40) rear end is connected, and inside is equipped with air stabilization baffle (51), air stabilization baffle (51) front end with shrink regulation baffle subassembly (41) rear end is connected for after stabilizing the air current form the shear flow that has the target shear rate behind stable section (50).
2. The adjustable shear rate shear flow generating system of claim 1, wherein: the front end of the contraction adjusting partition plate component (41) is in rotating and sealing connection or lap joint and sealing connection with the air inlet adjusting partition plate (32); the rear end of the contraction adjusting partition plate assembly (41) is in rotary sealing connection or lap joint and sealing connection with the air stabilizing partition plate (51); a plurality of baffle slots (31) are formed in the two side faces of the air inlet quantity adjusting section (30) from top to bottom, and the two sides of the air inlet adjusting baffle (32) are respectively inserted into the baffle slots (31) located on one side of the air inlet quantity adjusting section (30); and sealing strips which are abutted against the inner wall of the contraction adjusting section (40) are arranged on two sides of the contraction adjusting partition plate assembly (41).
3. The adjustable shear rate shear flow generation system of claim 1, wherein: the air inlet adjusting partition plate (32) is a plurality of groups, the contraction adjusting partition plate component (41) is also a plurality of groups corresponding to the air inlet adjusting partition plate (32) one by one, and the air stabilizing partition plate (51) is also a plurality of groups corresponding to the contraction adjusting partition plate component (41) one by one.
4. The adjustable shear rate shear flow generating system of claim 1, wherein said contraction adjusting diaphragm assembly (41) comprises:
the front partition (411) is of a plate-shaped structure, and the front end of the front partition is connected with the air inlet adjusting partition (32);
the rear clapboard (412) is of a plate-shaped structure, and the rear end of the rear clapboard is connected with the wind stabilizing clapboard (51);
and the telescopic joint structure is respectively connected with the front partition plate (411) and the rear partition plate (412) so that the front partition plate (411) and the rear partition plate (412) can be staggered back and forth.
5. The adjustable shear rate shear flow generation system of claim 4, wherein: the rear end of the front partition plate (411) is in lap joint with the front end of the rear partition plate (412), and the telescopic joint structure is positioned between the rear end of the front partition plate (411) and the front end of the rear partition plate (412); the telescopic joint structure comprises a sliding rail (413) and a sliding block (414), wherein the sliding rail (413) is arranged at the rear end of the front partition plate (411), the sliding block (414) is arranged at the front end of the rear partition plate (412), and the sliding rail (413) is in sliding fit with the sliding block (414) to enable the rear end of the front partition plate (411) to slide relative to the front end of the rear partition plate (412).
6. The adjustable shear rate shear flow generating system of claim 5, wherein: the front end of the rear partition plate (412) is at least provided with a front sliding block (414) and a rear sliding block (414), and the two sliding blocks (414) are in sliding fit with the same sliding rail (413); a plurality of groups of telescopic joint structures are arranged between the rear end of the front partition plate (411) and the front end of the rear partition plate (412), and sliding rails (413) of the telescopic joint structures in each group are arranged in parallel.
7. The adjustable shear rate shear flow generating system of claim 5, wherein: the contraction adjustment partition assembly (41) further comprises a fixing piece (416), and the fixing piece (416) is used for fixing the rear end of the front partition (411) and the front end of the rear partition (412); an outer wrapping layer (415) is further arranged outside the telescopic joint structure, the outer wrapping layer (415) wraps the rear end of the front partition plate (411) and the front end of the rear partition plate (412), and a gap between the front partition plate (411) and the rear partition plate (412) is sealed.
8. The adjustable shear rate shear flow generating system of claim 1, wherein: a damping gauze component is arranged in the rear stable section (50) to reduce the shear instability of each layer of airflow; the damping gauze component comprises a plurality of layers of damping gauzes, and the mesh densities of different parts of the damping gauze are positively correlated with the target shear rate of the corresponding shear flow of the part.
9. The adjustable shear rate shear flow generation system of claim 1, wherein: a front stabilizing section (20) is also arranged between the power section (10) and the intake adjusting section (30), and the front stabilizing section (20) is used for stabilizing wind power; a large-size fan and/or a small fan array are/is arranged in the power section (10) to provide wind power; a honeycomb device and a damping net are arranged in the front stabilizing section (20) to eliminate the disorder of the straight air flow and obtain a straight air flow; the outlet of the rear stabilizing section (50) is provided with a grid to adjust the turbulence; the power section (10), the front stabilizing section (20), the intake adjusting section (30), the contraction adjusting section (40) and the rear stabilizing section (50) are connected through flanges.
10. A method for adjusting shear flow, characterized by applying a shear rate adjustable shear flow generating system according to any of claims 1-9, comprising the steps of:
A. according to the target shear rate of the shear flow, inserting an air inlet adjusting partition plate (32) into one group of partition plate slots (31), keeping a contraction adjusting partition plate assembly (41) in a straight state, and enabling the outlet of a rear stable section (50) to form the shear flow;
B. detecting whether the shear flow at the outlet of the rear stable section (50) meets a target shear rate; if not, repeating the step A, wherein the air inlet adjusting partition plate (32) is required to be inserted into another group of partition plate slots (31) to obtain different shear flows until the shear flow meeting the target shear rate is obtained.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441598A (en) * | 1980-10-27 | 1984-04-10 | Wallace Murray Corporation | Modulated viscous fan drive |
| JP2005156513A (en) * | 2003-11-27 | 2005-06-16 | San Technology:Kk | Low noise nozzle |
| CN109799049A (en) * | 2019-03-06 | 2019-05-24 | 北京理工大学 | A kind of elastic cylinder vortex-induced vibration rule and coupling mechanism measuring method |
| CN212158998U (en) * | 2020-07-06 | 2020-12-15 | 郑州大学 | Device for simulating wind profile by utilizing parallel flat plate in sports car test |
| CN212844277U (en) * | 2020-08-14 | 2021-03-30 | 重庆大学 | Downburst storm wind tunnel test wind field simulation device |
| CN112985744A (en) * | 2021-03-24 | 2021-06-18 | 中国科学院工程热物理研究所 | Grid device for wind tunnel experiment and regulating and controlling method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7880883B2 (en) * | 2007-10-12 | 2011-02-01 | Interactive Flow Studies Corporation | Fluid flow computation, visualization, and analysis |
-
2022
- 2022-07-13 CN CN202210817921.1A patent/CN114894426B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4441598A (en) * | 1980-10-27 | 1984-04-10 | Wallace Murray Corporation | Modulated viscous fan drive |
| JP2005156513A (en) * | 2003-11-27 | 2005-06-16 | San Technology:Kk | Low noise nozzle |
| CN109799049A (en) * | 2019-03-06 | 2019-05-24 | 北京理工大学 | A kind of elastic cylinder vortex-induced vibration rule and coupling mechanism measuring method |
| CN212158998U (en) * | 2020-07-06 | 2020-12-15 | 郑州大学 | Device for simulating wind profile by utilizing parallel flat plate in sports car test |
| CN212844277U (en) * | 2020-08-14 | 2021-03-30 | 重庆大学 | Downburst storm wind tunnel test wind field simulation device |
| CN112985744A (en) * | 2021-03-24 | 2021-06-18 | 中国科学院工程热物理研究所 | Grid device for wind tunnel experiment and regulating and controlling method thereof |
Non-Patent Citations (3)
| Title |
|---|
| An automatized methodology to generate velocity distortion panels for wind tunnel testing;A. Broatch等;《Journal of Wind Engineering and Industrial Aerodynamics》;20220624;1-14 * |
| 线性黏滞阻尼器在某超高层建筑中的应用;侯胜利等;《建筑结构》;20141225(第24期);70-74 * |
| 风口扰动对出风频谱特性影响的实验研究;张川等;《建筑热能通风空调》;20141125(第06期);6-10 * |
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