Wind tunnel test equipment for wind-induced particle drift

Abstract

Provided is a wind tunnel test device for wind-induced particle drift. The device is installed in a test section of a wind tunnel, and includes a drive assembly and a screen assembly. The screen assembly includes an inner frame for installing a screen, and the screen is used to load particles. The drive assembly includes a first motor, and the drive assembly outputs the rotation output by the first motor. The wind tunnel test device also includes a track, and the track is used to be installed on the wall of the wind tunnel. The first motor is installed on the screen assembly, and the screen assembly is movably supported on the track. The output end of the drive assembly engages with the track to drive the screen assembly to move along the track. The device utilizes the flow field of the wind tunnel test section, and the track is installed on the wall of the wind tunnel test section, eliminating the complex support structure dedicated to supporting the track. Therefore, the wind tunnel test device has a simple structure, a small windward surface, low cost, high feasibility, low blockage rate, and small wind profile influence, and can effectively simulate snow loads on actual large-span complex structures.

Description

Technical Field

[0001] The present disclosure relates to a wind tunnel test device, and in particular to a wind tunnel test device for wind-induced particle drift. Background Art

[0002] Conventional wind tunnel scaled tests are the mainstream research method for building design snow loads, with the advantages of low cost and high reference value. The building structure and its surrounding interference objects are reduced in a certain proportion and placed on the test bench of the wind tunnel test section. According to the fluid mechanics similarity criterion, particles with specific diameters and densities (such as plastic fragments, silica sand, baking soda, sawdust, etc.) and specific wind speeds are selected to reproduce the entire process of snowfall and wind-induced snow drift to a large extent. The final distribution can be used as a reference value for snow distribution on the building area.

[0003] However, existing conventional wind tunnel snow load test equipment is mainly designed for scientific research needs, and often ignores the control of the windward area of ​​the equipment. It has a complex structure and a large blockage ratio, resulting in a high model scale ratio. It is unable to fully simulate the large-span complex roof structures that often appear in architectural design, and even qualitative test analysis is relatively difficult.

[0004] The prior art proposes the following test equipment.

[0005] CN106017850A discloses an outdoor wind-induced snow drift test device, which uses a fan device to provide wind power and a vibrating screen to provide a snowfall environment. The test device is equivalent to a new outdoor wind tunnel system, which is expensive to build and highly dependent on external climate environments such as temperature and wind power.

[0006] CN108181075A discloses a natural snowfall wind tunnel simulation test device, in which the target building is covered by a box, and the wind blown by the wind tunnel blowing device blows toward the target building through the path defined by the box. The device has two layers of vibrating screens and a supporting structure, and the supporting structure supports the vibrating screen above the target building. The reciprocating reverse vibration of the vibrating screen can achieve the purpose of accurately controlling the amount of simulated snowfall. The device has the following disadvantages:

[0007] First, the box and supporting structure are large in size, resulting in high blockage, which reduces the efficiency of the wind tunnel and forces the test model to be scaled up, reducing the accuracy of the test results.

[0008] Second, it is inconvenient to fill and replenish materials to the vibrating screen;

[0009] Third, after the test is completed, if other types of wind tunnel tests are needed in the wind tunnel, the test equipment must be completely dismantled, and manpower and material resources must be spent on reinstalling the equipment before the next snow load test. Summary of the invention

[0010] The present disclosure is made in view of the above-mentioned state of the prior art. The purpose of the present disclosure is to provide a wind tunnel test device for wind-induced particle drift, which can effectively simulate the impact of wind-induced particles on building structures, and has a simple structure, low blockage ratio, and convenient testing.

[0011] Provided is a wind tunnel test device for wind-induced particle drift, which includes a drive assembly and a screen assembly, wherein the screen assembly includes an inner frame for mounting a screen, and the screen is used to load particulate matter, and the drive assembly includes a first motor, and the drive assembly outputs the rotation output by the first motor. The wind tunnel test device also includes a track, and the track is used to be installed on the wall of the wind tunnel, the first motor is installed on the screen assembly, and the screen assembly is movably supported on the track, and the output end of the drive assembly engages with the track to drive the screen assembly to move along the track.

[0012] Preferably, the wind tunnel test equipment includes two tracks arranged opposite to each other, and the driving assembly also includes at least one first transmission shaft rotatably mounted on the screen assembly, the first transmission shaft is meshed with the output shaft of the first motor, and both ends of the first transmission shaft are respectively meshed with the two tracks.

[0013] Preferably, the wind tunnel test equipment further comprises a lifting assembly, and an output end of the lifting assembly is connected to the inner frame, so that the lifting assembly drives the inner frame to rise and fall.

[0014] Preferably, the screen assembly further comprises an outer frame, the outer frame is externally mounted on the inner frame, the outer frame is slidably supported on the track, the lifting assembly is supported on the outer frame, and the inner frame can be lifted and lowered relative to the outer frame.

[0015] Preferably, the lifting assembly includes a second motor and a drum, the second motor is installed on the outer frame, the second motor drives the drum to rotate, and the drum is used to wind a rope connected to the inner frame, so that when the drum rotates, the rope is retracted and the inner frame is lifted and lowered.

[0016] Preferably, the lifting assembly also includes a second transmission shaft, the reel is sleeved on two end portions of the second transmission shaft, the second transmission shaft is meshed with the output shaft of the second motor and is rotatably mounted on the outer frame, and the ropes wound around the reel at the two ends of the second transmission shaft are respectively used to pull the two ends of the second transmission shaft of the inner frame in the extension direction.

[0017] Preferably, the lifting assembly also includes a second transmission shaft, which is meshed with the output shaft of the second motor and is rotatably mounted on the outer frame, and each end of the second transmission shaft is sleeved with two of the reels, and the ropes wound around the two reels at the same end of the second transmission shaft are used to pull the two ends of the inner frame in a direction perpendicular to the extension direction of the second transmission shaft.

[0018] Preferably, when the test is in progress, the lifting assembly is arranged on the side of the screen assembly.

[0019] Preferably, the track is provided with a tooth groove, the tooth groove has an opening open in the horizontal direction, the drive assembly is provided with a first tooth portion, the upper side wall of the tooth groove is provided with a second tooth portion, the first tooth portion is meshed with the second tooth portion and does not contact the lower side wall of the tooth groove, and the screen assembly also includes a roller, which is rotatably supported on the lower side wall of the tooth groove.

[0020] Preferably, when the test is being conducted, the drive assembly is located to the side of the screen assembly.

[0021] The above technical solution provided by the present disclosure has at least the following beneficial effects:

[0022] The wind tunnel test equipment provided by the present invention is placed in a wind tunnel, and the flow field provided by the wind tunnel test section is utilized. The track is installed on the wall of the wind tunnel test section, eliminating the complex support structure dedicated to supporting the track. Therefore, the wind tunnel test equipment has a simple structure, a small windward surface, low cost, high feasibility, is not affected by external environmental factors of the wind tunnel, has a low blockage rate, and is less affected by the wind profile, so that snow loads can be effectively simulated on actual large-span complex structures.

[0023] It can also have the following effects:

[0024] The wind tunnel test equipment uses a drive motor (drive component) to drive the screen component connected to it as a whole to move along the track to achieve flexible movement of the screen component, and is realized with a simple structure: when the test particles are to be supplemented, it is only necessary to lower the inner frame to the minimum, and there is no need to carry materials to the top of the equipment, saving manpower efficiency; when the working condition is to be switched, it is only necessary to move the screen component along the track to the specified position, without disassembling and adjusting the equipment and the test model; after the test, it is only necessary to move the screen component along the track to the specified position for storage, such as storing it at the top of the wind tunnel downstream of the test section, so as not to hinder other types of wind tunnel tests. In this way, there is no need to dismantle the test equipment when supplementing particles, switching working conditions, and after the test, and there is no need to reinstall the device before conducting the simulation test again, which greatly saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A perspective schematic diagram of a wind tunnel test apparatus for wind-induced particle drift provided for the present disclosure, showing a screen located above a target building.

[0026] Figure 2 A magnified view of the drive components of a wind tunnel test apparatus for wind-induced particle drift.

[0027] Figure 3 A magnified view of the lifting assembly of a wind tunnel test facility for wind-induced particle drift.

[0028] Figure 4 A three-dimensional schematic diagram of a wind tunnel test device for wind-induced particle drift, showing the screen moving to the upper side of a target building.

[0029] Figure 5 A three-dimensional schematic diagram of a wind tunnel test apparatus for wind-induced particle drift showing the screen lowered to near the ground.

[0030] Description of reference numerals:

[0031] 1 track, 10 tooth groove, 21 inner frame, 22 outer frame, 31 first motor, 32 second motor, 41 first bearing, 42 second bearing, 51 first tooth portion, 52 second tooth portion, 61, 61', 610, 610' gear, 62 pulley, 63 roller, 64 rope, 65 drum, 66 lifting ring, 71 first transmission shaft, 72 second transmission shaft, 7 target building, 8 turntable, 9 wall portion. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present disclosure, and are not intended to exhaust all possible ways of the present disclosure, nor to limit the scope of the present disclosure.

[0033] like Figures 1 to 3 As shown, the present disclosure provides a wind tunnel test device for wind-induced particle drift (hereinafter referred to as "wind tunnel test device"), which includes a screen assembly, a drive assembly, a lifting assembly and a track 1. The wind tunnel test device can be used in conjunction with a target building 7 and a turntable 8, the turntable 8 can rotate 360 ​​degrees, and the target building 7 is arranged on the turntable 8 and can rotate with the turntable 8.

[0034] The wind tunnel test section includes a wall 9 and a top (not shown), the top and the wall 9 enclose a space for air flow, and the wind tunnel test equipment, the target building 7 and the turntable 8 are all located in the space. The track 1 is used to be installed on the wall 9 of the wind tunnel, and the wind tunnel test equipment may include two tracks 1 arranged opposite to each other, the screen assembly, the drive assembly and the lifting assembly may be arranged between the two tracks 1, and the screen assembly, the drive assembly and the lifting assembly may be installed as a whole and can move along the track 1 together.

[0035] The screen assembly includes an inner frame 21 for mounting the screen, the screen is used to load particulate matter, the inner frame 21 is, for example, a square frame, the screen is integrally mounted on the inner side of the square frame, the inner frame 21 can be driven by, for example, a motor to vibrate so that the particulate matter is screened out. The screen assembly also includes an outer frame 22, for example, a square frame, and the outer frame 22 is mounted on the inner frame 21.

[0036] It should be noted that "the side of the screen assembly" refers to the side of the screen assembly in the direction of particle screening (for example, the vertical direction after the test equipment is assembled).

[0037] The screen assembly may further include a roller 63 , which is, for example, mounted on the outer side of the outer frame 22 . The roller 63 may be assembled with the track 1 so that the screen assembly is movably, for example, rollably, supported on the track 1 .

[0038] like Figure 2 As shown, the driving assembly includes a first motor 31 and a first transmission shaft 71. The first motor 31 is mounted on the outer frame 22 and thus mounted on the screen assembly. The first bearing 41 is mounted on the outer frame 22. The first transmission shaft 71 is rotatably mounted on the outer frame 22 through the first bearing 41. The first transmission shaft 71 is arranged side by side with the output shaft of the first motor 31 and is respectively sleeved with gears 61 and 61'. The first transmission shaft 71 and the output shaft of the first motor 31 are meshed through their respective gears 61 and 61' so that the first transmission shaft 71 rotates with the output shaft of the first motor 31. The first transmission shaft 71 outputs the rotation output by the first motor 31, so that the driving assembly outputs the rotation output by the first motor 31.

[0039] In other embodiments, the wind tunnel test equipment may also include more than two tracks 1 and two or more first transmission shafts 71. For example, two groups of tracks arranged in parallel are provided, and two first transmission shafts 71 are respectively matched with the two groups of tracks, each group of tracks includes two spaced tracks 1, and both ends of each first transmission shaft 71 are mounted to the two tracks 1 of each group.

[0040] When the test is in progress, the entire drive assembly is located on the side of the screen assembly, which helps to reduce the thickness of the entire test equipment in the vertical direction, reduce the impact on wind, and thus reduce the blockage rate.

[0041] The rail 1 has a tooth groove 10 having an opening opened in the horizontal direction so that the tooth groove 10 has an upper side wall and a lower side wall disposed opposite to each other in the vertical direction.

[0042] The first transmission shaft 71 has first tooth portions 51 at both ends, such as gears, and the upper side wall of the tooth groove 10 has second tooth portions 52, such as toothed belts, so that the first transmission shaft 71 (the output end of the driving assembly) is engaged with the track 1. When the output shaft of the first motor 31 rotates, the first transmission shaft 71 rotates and drives the screen assembly to move along the track 1. Both ends of the first transmission shaft 71 are provided with first tooth portions 51, which are respectively in contact with the second tooth portions 52 on both sides to achieve smooth movement.

[0043] The roller 63 of the screen assembly is supported on the lower side wall of the tooth groove 10 (preferably, the lower side wall of the tooth groove 10 has no teeth), and the first tooth portion 51 does not contact the lower side wall when engaging with the second tooth portion 52 of the upper side wall of the tooth groove 10. Therefore, the first tooth portion 51 does not bear weight but is only used to transmit power to protect the first tooth portion 51. The first tooth portion 51 and the roller 63 are assembled in the tooth groove 10 of the same track 1, which simplifies the test equipment.

[0044] The wind tunnel test equipment provided by the present invention is placed in a wind tunnel. By utilizing the flow field provided by the wind tunnel test section, the track 1 is installed on the wall 9 of the wind tunnel test section, thereby eliminating the complex support structure dedicated to supporting the track 1. Therefore, the wind tunnel test equipment has a simple structure, low cost, high feasibility, is not affected by external environmental factors of the wind tunnel, has a low blockage rate, and is less affected by the wind profile, which can make the test model closer to reality and effectively simulate the snow load on actual large-span complex structures.

[0045] When the wind tunnel is larger and the two walls 9 are farther apart, the screen assembly may occupy only a portion of the length of the first transmission shaft 71 , that is, the first transmission shaft 71 may be larger than the screen assembly (screen) in a direction perpendicular to the track 1 .

[0046] like Figure 3 As shown, the lifting assembly may include a second motor 32, a second transmission shaft 72 and a reel 65. The second motor 32 is mounted on the outer frame 22, the second bearing 42 is mounted on the outer frame 22, and the second transmission shaft 72 is rotatably mounted on the outer frame 22 through the second bearing 42. The second transmission shaft 72 is arranged side by side with the output shaft of the second motor 32 and is respectively sleeved with gears 610 and 610'. The second transmission shaft 72 and the output shaft of the second motor 32 are meshed through their respective gears 610 and 610' so that the second transmission shaft 72 rotates with the output shaft of the second motor 32, and the second transmission shaft 72 outputs the rotation output by the second motor 32, so that the lifting assembly outputs the rotation output by the second motor 32.

[0047] The lifting assembly (the second motor 32, the second transmission shaft 72, etc.) is supported on the outer frame 22, thereby eliminating the need for a structure specifically used to support the lifting assembly and simplifying the test equipment.

[0048] The inner frame 21 can move relative to the outer frame 22 in, for example, a vertical direction, and the second transmission shaft 72 (the output end of the lifting assembly) is connected to the inner frame 21 to drive the lifting of the inner frame 21 and the screen. Specifically, the inner frame 21 can be provided with a ring 66, and the outer frame 22 can be provided with a pulley 62. The rope 64 is wound around the drum 65 and connected to the ring 66 through the pulley 62 to connect to the inner frame 21. The drum 65 is driven by the second motor 32 to rotate, for example, it is sleeved on the second transmission shaft 72.

[0049] The relative movement of the inner frame 21 with respect to the outer frame 22 in the vertical direction can be achieved by retracting and releasing the rope 64, that is, the second motor 32 drives the second rotating shaft 72 and then drives the drum 65 to rotate. At this time, the rope 64 is retracted and released so that the inner frame 21 rises and falls. Specifically, when the rope 64 is released, the inner frame 21 descends, and when the rope 64 is retracted, the inner frame 21 rises.

[0050] When filling the material, the lifting assembly (second motor 32) can be started to lower the inner frame 21 for convenient operation. After the filling of the material is completed, the lifting assembly raises the inner frame 21.

[0051] The wind tunnel test equipment uses a driving motor (driving component) to drive the screen assembly connected to it as a whole to move along the track 1 to achieve flexible movement of the screen assembly, which is realized with a simple structure: when the test particulate matter is to be supplemented, it is only necessary to lower the inner frame 21 to the lowest position, and there is no need to carry materials to the top of the equipment, saving manpower efficiency; when the working condition is to be switched, it is only necessary to move the screen assembly along the track to the specified position, and there is no need to disassemble and adjust the equipment and the test model; after the test, it is only necessary to move the screen assembly along the track 1 to the specified position for storage, such as storing it at the top of the wind tunnel downstream of the test section, so as not to hinder other types of wind tunnel tests. In this way, there is no need to dismantle the test equipment when switching the working condition and after the test, and there is no need to reinstall the device before conducting the simulation test again, which greatly saves manpower and material resources.

[0052] The drum 65 can be sleeved on the two ends of the second transmission shaft 72, and the ropes 64 wound by the drums 65 at the two ends of the second transmission shaft 72 are respectively used to pull the two ends of the second transmission shaft 72 of the inner frame 21 in the extension direction. Specifically, the second transmission shaft 72 can extend to the two ends of the inner frame 21, or extend beyond the two ends of the inner frame 21, and the drum 65 is installed corresponding to the two ends of the inner frame 21. In this way, the second transmission shaft 72 transmits the power of the second motor 32 to the two ends of the inner frame 21, which is conducive to the smooth operation of the inner frame 21 and the screen, and simplifies the test equipment.

[0053] Two drums 65 can be sleeved on each end of the second transmission shaft 72, and the ropes 64 wound by the two drums 65 are used to pull the two ends of the inner frame 21 in a direction perpendicular to the extension direction of the second transmission shaft 72. In this way, one end of the second transmission shaft 72 can transmit the power of the second motor 32 to the two ends of the inner frame 21, which is conducive to smoothly operating the inner frame 21 and the screen and simplifying the test equipment.

[0054] In this way, the inner frame 21 is pulled at four positions in two directions perpendicular to each other by using one second transmission shaft 72, thereby simplifying the test equipment.

[0055] When the test is in progress, the lifting assembly (second motor 32, second transmission shaft 72, etc.) can be located on the side of the screen assembly, for example, on the opposite sides of the screen assembly with the drive assembly. This is conducive to reducing the thickness of the entire test equipment in the vertical direction, reducing the impact on wind, and thus reducing the blockage rate.

[0056] When conducting the test, the blowing device of the wind tunnel is started to blow air to the target building 7. Different working conditions can be simulated by adjusting the wind speed, the wind direction of the turntable, and the properties of the particles, such as different wind force levels, different wind directions, and different snowfall conditions. While changing the wind speed, the screen assembly can be moved along the track 1 to the upper side of the target building 7 so that the particles falling from the screen will meet the target building 7 (such as Figure 4 shown).

[0057] Furthermore, the screen can be lowered by a lifting assembly (such as Figure 5 As shown), operations such as filling materials can be performed, and filling materials is very convenient.

[0058] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present disclosure. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present disclosure without departing from the scope of the present disclosure.

Claims

1. A wind tunnel test device for wind-induced particle drift, comprising a drive assembly and a screen assembly, wherein the screen assembly comprises an inner frame (21) for mounting a screen, and the screen is used to load particles, characterized in that: The drive assembly comprises a first motor (31), and the drive assembly outputs the rotation output by the first motor (31). The wind tunnel test equipment also comprises a track (1), and the track (1) is used to be installed on the wall of the wind tunnel. The first motor (31) is installed on the screen assembly, and the screen assembly is movably supported on the track (1). The output end of the drive assembly is engaged with the track (1) to drive the screen assembly to move along the track (1).

2. The wind tunnel test equipment for wind-induced particle drift according to claim 1, characterized in that: The wind tunnel test equipment comprises two tracks (1) arranged opposite to each other, and the driving assembly further comprises at least one first transmission shaft (71) rotatably mounted on the screen assembly, the first transmission shaft (71) being meshed with an output shaft of the first motor (31), and two ends of the first transmission shaft (71) being respectively meshed with the two tracks (1).

3. The wind tunnel test equipment for wind-induced particle drift according to claim 1, characterized in that: The wind tunnel test equipment further comprises a lifting component, wherein an output end of the lifting component is connected to the inner frame (21), so that the lifting component drives the inner frame (21) to rise and fall.

4. The wind tunnel test equipment for wind-induced particle drift according to claim 3, characterized in that: The screen assembly further comprises an outer frame (22), the outer frame (22) being externally mounted on the inner frame (21), the outer frame (22) being slidably supported on the track (1), the lifting assembly being supported on the outer frame (22), and the inner frame (21) being capable of being lifted and lowered relative to the outer frame (22).

5. The wind tunnel test equipment for wind-induced particle drift according to claim 4, characterized in that: The lifting assembly comprises a second motor (32) and a drum (65), wherein the second motor (32) is mounted on the outer frame (22), and the second motor (32) drives the drum (65) to rotate, and the drum (65) is used to wind a rope (64) connected to the inner frame (21), so that when the drum (65) rotates, the rope (64) is retracted and released, and the inner frame (21) is lifted or lowered.

6. The wind tunnel test equipment for wind-induced particle drift according to claim 5, characterized in that: The lifting assembly also includes a second transmission shaft (72), the drum (65) is sleeved on two ends of the second transmission shaft (72), the second transmission shaft (72) is meshed with the output shaft of the second motor (32) and is rotatably mounted on the outer frame (22), and the ropes (64) wound around the drum (65) at the two ends of the second transmission shaft (72) are respectively used to pull the two ends of the second transmission shaft (72) of the inner frame (21) in the extension direction.

7. The wind tunnel test equipment for wind-induced particle drift according to claim 5, characterized in that: The lifting assembly further comprises a second transmission shaft (72), the second transmission shaft (72) being meshed with the output shaft of the second motor (32) and being rotatably mounted on the outer frame (22), two of the drums (65) being sleeved on each end of the second transmission shaft (72), and the ropes (64) wound around the two drums (65) at the same end of the second transmission shaft (72) being used for pulling the two ends of the inner frame (21) in a direction perpendicular to the extension direction of the second transmission shaft (72).

8. The wind tunnel test equipment for wind-induced particle drift according to claim 3, characterized in that: When the test is in progress, the lifting assembly is arranged on the side of the screen assembly.

9. The wind tunnel test equipment for wind-induced particle drift according to claim 1, characterized in that: The track (1) is provided with a tooth groove (10), the tooth groove (10) has an opening open in the horizontal direction, the driving assembly is provided with a first tooth portion (51), the upper side wall of the tooth groove (10) is provided with a second tooth portion (52), the first tooth portion (51) is meshed with the second tooth portion (52) and does not contact the lower side wall of the tooth groove (10), and the screen assembly also includes a roller (63), and the roller (63) is rotatably supported on the lower side wall of the tooth groove (10).

10. The wind tunnel test equipment for wind-induced particle drift according to claim 1, characterized in that: When the test is being conducted, the drive assembly is located to the side of the screen assembly.

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