A perforated plate wind tunnel test device capable of quickly adjusting the porosity

Abstract

The invention discloses a perforated plate wind tunnel test device capable of quickly adjusting the porosity. A steel partition is connected to a wind tunnel turntable by a steel screw, a round board is arranged above the steel partition, the round board is connected to the wind tunnel turntable by a wooden rod, a square through slot is provided on the round board, a force measuring balance is placed on the steel partition, the top of the force measuring balance passes through the square through slot and is connected to a square aluminum plate of a test body, a rectangular frame is welded to the upper surface of the square aluminum plate of the test body, the square aluminum plate of the interference body is fixedly connected to the round board, a concave frame is welded to the square aluminum plate of the interference body, horizontal baffles and vertical baffles are both adsorbed on the rectangular frame and the concave frame, the rectangular frame and the concave frame are in the same plane, and scale lines are provided on the rectangular frame and the concave frame. The invention can realize the test of wind loads of perforated plates with different porosity in a wind tunnel, and can also study the influence of different gap forms such as rectangular holes and strip holes on the test results.

Description

Technical Field

[0001] The invention belongs to a wind tunnel testing device in the field of construction engineering, and in particular relates to a perforated plate wind tunnel testing device capable of quickly adjusting void ratio. Background Art

[0002] In order to meet the requirements of wind protection and landscape, perforated plates are widely used in the field of construction engineering. Domestic and foreign specifications do not provide regulations for the wind load of perforated plates. The main reason is that the shape of perforated plates is complex, involving the shape of holes and the overall porosity. These parameters have a great influence on the wind load of perforated plates. In order to ensure the wind resistance safety of perforated plates, it is necessary to accurately obtain the wind load of perforated plates under different working conditions. Usually, the wind load results are obtained by conducting force measurement wind tunnel tests on perforated plate models in wind tunnels. In actual projects, the porosity, void form, and working conditions of perforated plates are often different for different site conditions, wind protection requirements, or landscape requirements. In the commonly used method, the wind tunnel test of perforated plates with each porosity and void form requires the re-production of test specimens. At the same time, the perforated plate itself has a large area, and the wind tunnel force measurement can only test a small area. Therefore, the interference of surrounding perforated plates needs to be considered during the test to reflect the wind load of the perforated plate under large surface conditions. At the same time, in the model making of the perforated plate, the cutting and grinding production cycle of the perforated plate specimens is long, the specimens are mostly used only once in the test, and the cost of the model is also very high. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, quickly simulate perforated plates with different gaps, and improve the utilization rate of test pieces, it is necessary to develop a wind tunnel test device for perforated plate wind load with adjustable porosity to provide a basis for the wind resistance design of perforated plates. In order to consider the influence of the porosity of the perforated plate on the wind load of the perforated plate, the purpose of the present invention is to provide a perforated plate wind tunnel test device with rapid adjustment of the porosity, obtain the wind load of the perforated plate under different porosity parameters, and realize two working conditions: only the test body and the surrounding interference, and also study the influence of different gap forms such as square holes, rectangular holes and strip holes on the test results.

[0004] The technical solution of the present invention is as follows:

[0005] The perforated plate wind tunnel test device includes a fixed component and a perforated plate model, the perforated plate model is located above the fixed component, and a force balance in the fixed component is connected to the perforated plate model; the fixed component includes a steel partition, a steel screw, a force balance, a round board and a wooden pole, a steel partition coaxial with the wind tunnel turntable is provided above the wind tunnel turntable at the bottom of the building wind tunnel, the outer periphery of the steel partition and the inner periphery of the wind tunnel turntable are fixedly connected by a plurality of steel screws, a round board coaxial with the steel partition is provided above the circular steel partition, the outer periphery of the round board and the outer periphery of the wind tunnel turntable are fixedly connected by a plurality of wooden poles, a square through slot is provided in the center of the round board, the force balance is placed on the upper surface of the steel partition, the top of the force balance passes through the square through slot and is connected to the perforated plate model, and the upper surface of the force balance is flush with the upper surface of the round board.

[0006] The perforated plate model comprises a test body perforated frame, an interference body perforated frame, a transverse baffle and a vertical baffle, and the test body perforated frame is connected to the interference body perforated frame through a fixing component;

[0007] The test body perforated frame includes a test body square aluminum plate and a rectangular frame, the test body square aluminum plate is placed parallel to the round wooden board and located above the middle of the square through slot, the test body square aluminum plate is placed on the upper surface of the force measuring balance, the rectangular frame is a flat plate frame, the bottom end of the rectangular frame is welded to the upper surface in the middle of the test body square aluminum plate, a plurality of horizontal baffles are adsorbed on one surface of the rectangular frame, and a plurality of vertical baffles are adsorbed on the other surface of the rectangular frame;

[0008] The interference body perforated frame includes two interference body square aluminum plates and a concave frame. The two interference body square aluminum plates are fixed on the upper surface of the round wooden board by bolts. The two interference body square aluminum plates are respectively located on both sides of the test body square aluminum plate. There is a gap between the interference body square aluminum plate and the test body square aluminum plate. The concave frame is an inverted concave flat plate frame. Two convex structures at the bottom of the concave frame are respectively welded to the two interference body square aluminum plates. A plurality of horizontal retaining bars are adsorbed on one surface of the concave frame, and a plurality of vertical retaining bars are adsorbed on the other surface of the concave frame.

[0009] The rectangular frame and the concave frame are in the same plane, the rectangular frame is located in the concave part of the concave frame, and there is a gap between the concave frame and the rectangular frame.

[0010] The horizontal baffles and the vertical baffles are both made of iron, the rectangular frame and the concave frame are both made of magnets, a plurality of horizontal baffles are arranged at intervals along the height direction of the rectangular frame, each horizontal baffle is arranged along the width direction of the rectangular frame, a plurality of vertical baffles are arranged at intervals along the width direction of the rectangular frame, and each vertical baffle is arranged along the height direction of the rectangular frame;

[0011] The rectangular frame and the concave frame are rectangular holes where the horizontal and vertical baffles are not provided.

[0012] The outer periphery of the rectangular frame and the outer periphery of the concave frame are both provided with scale lines, and the scale lines are used to adjust the distance between adjacent horizontal baffles and adjacent vertical baffles. The scale lines are non-top scale lines, and the zero scale lines of the scale lines coincide with the inner edges of the rectangular frame / the inner edges of the concave frame respectively.

[0013] The size of the rectangular frame and the size of the concave frame are determined according to the size and blockage ratio of the building wind tunnel.

[0014] The width of the horizontal baffle and the width of the vertical baffle are both the same fixed width.

[0015] Both the horizontal baffle bars and the vertical baffle bars have various length specifications, and the lengths of the horizontal baffle bars and the vertical baffle bars are determined according to the size of the rectangular frame and the size of the concave frame.

[0016] The wind direction angle of the wind tunnel test is 0°~90°, and the wind direction angle is the angle between the wind direction and the out-of-plane direction of the rectangular frame.

[0017] The present invention achieves the purpose of quickly adjusting the porosity of a perforated plate in a perforated plate wind tunnel test, and can also realize two working conditions, one with only a test body and one with surrounding interference, and can also study the influence of different porosity forms such as square holes, rectangular holes and strip holes on the test results.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention can test the wind load of perforated plates with different porosity in wind tunnels. A number of iron baffles are placed vertically and horizontally on the magnetic flat plate frame using the magnetic attraction principle. By changing the position and number of baffles, different hole spacing, hole side length, hole margin, hole form and other hole forming parameters of the perforated plate are simulated to obtain the wind load of the perforated plate with different hole forming conditions, and analyze the influence of different porosity on the wind load of the perforated plate.

[0020] 2. The present invention can realize two working conditions: one with only a test body and one with surrounding interference, providing a basis for the wind-resistant design of the perforated plate.

[0021] 3. The present invention has the characteristics of simple installation and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the device of the present invention;

[0023] Figure 2 It is a front view of a perforated plate model of the present invention with a rectangular hole;

[0024] Figure 3It is a layout diagram of the transverse baffles and the vertical baffles of the present invention;

[0025] Figure 4 It is a schematic diagram of the frame scale lines of the present invention.

[0026] In the figure: 1. Building wind tunnel; 2. Wind tunnel turntable; 3. Steel partition; 4. Steel screw; 5. Force balance; 6. Square through slot; 7. Round wooden board; 8. Wooden pole; 9. Test body perforated frame; 10. Interference body perforated frame; 11. Test body square aluminum plate; 12. Rectangular frame; 13. Horizontal baffle; 14. Vertical baffle; 15. Interference body square aluminum plate; 16. Concave frame; 17. Scale line. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] The perforated plate wind tunnel test device comprises a fixed component and a perforated plate model, wherein the perforated plate model is located on the fixed component, and a force balance 5 in the fixed component is connected to the perforated plate model;

[0029] Figure 1 As shown, the fixed parts include a steel partition plate 3, a steel screw rod 4, a force balance 5, a round wooden board 7 and a wooden pole 8. A steel partition plate 3 coaxial with the wind tunnel turntable 2 is provided above the wind tunnel turntable 2 at the bottom of the building wind tunnel 1. The outer periphery of the steel partition plate 3 and the inner periphery of the wind tunnel turntable 2 are fixedly connected by a plurality of steel screw rods 4. A round wooden board 7 coaxial with the steel partition plate 3 is provided above the circular steel partition plate 3. The outer periphery of the round wooden board 7 and the outer periphery of the wind tunnel turntable 2 are fixedly connected by a plurality of wooden poles 8. A square through groove 6 is provided in the center of the round wooden board 7. The force balance 5 is placed on the upper surface of the steel partition plate 3. The top of the force balance 5 passes through the square through groove 6 and is connected to the perforated plate model. The upper surface of the force balance 5 is flush with the upper surface of the round wooden board 7.

[0030] The perforated plate model comprises a test body perforated frame 9, an interference body perforated frame 10, a transverse blocking bar 13 and a vertical blocking bar 14, and the test body perforated frame 9 is connected to the interference body perforated frame 10 through a fixing component;

[0031] Figure 2 and Figure 3As shown, the test body perforated frame 9 includes a test body square aluminum plate 11 and a rectangular frame 12. The test body square aluminum plate 11 is placed parallel to the round wood board 7 and is located above the middle of the square through slot 6. The size of the square through slot 6 is larger than the size of the test body square aluminum plate 11. There is no contact between the round wood board 7 and the test body square aluminum plate 11. The test body square aluminum plate 11 is placed on the upper surface of the force measuring balance 5. The rectangular frame 12 is a flat plate frame. The bottom end of the rectangular frame 12 is welded to the upper surface in the middle of the test body square aluminum plate 11. A plurality of horizontal baffles 13 are adsorbed on one surface of the rectangular frame 12, and a plurality of vertical baffles 14 are adsorbed on the other surface of the rectangular frame 12.

[0032] The interference body perforated frame 10 includes two interference body square aluminum plates 15 and a concave frame 16. The two interference body square aluminum plates 15 are fixedly installed on the upper surface of the round wooden board 7 by bolts. The two interference body square aluminum plates 15 are respectively located on both sides of the test body square aluminum plate 11. There is a gap between the interference body square aluminum plate 15 and the test body square aluminum plate 11. The concave frame 16 is an inverted concave flat plate frame. The two convex structures at the bottom of the concave frame 16 are respectively welded to the two interference body square aluminum plates 15. A plurality of horizontal retaining bars 13 are adsorbed on one surface of the concave frame 16, and a plurality of vertical retaining bars 14 are adsorbed on the other surface of the concave frame 16.

[0033] The rectangular frame 12 and the concave frame 16 are in the same plane, so that the concave frame 16 and the rectangular frame 12 are continuous in space. The rectangular frame 12 is located in the concave part of the concave frame 16 . There is a gap between the concave frame 16 and the rectangular frame 12 , so that there is no contact between the rectangular frame 12 and the concave frame 16 .

[0034] Figure 3 a and Figure 3 As shown in FIG. 2 , the horizontal baffles 13 and the vertical baffles 14 are both made of iron, the rectangular frame 12 and the concave frame 16 are both made of magnets, a plurality of horizontal baffles 13 are arranged at intervals along the height direction of the rectangular frame 12 (i.e., the height direction of the concave frame 16), each horizontal baffle 13 is arranged along the width direction of the rectangular frame 12, a plurality of vertical baffles 14 are arranged at intervals along the width direction of the rectangular frame 12 (i.e., the width direction of the concave frame 16), and each vertical baffle 14 is arranged along the height direction of the rectangular frame 12;

[0035] The rectangular frame 12 and the concave frame 16 are rectangular holes where the transverse bars 13 and the vertical bars 14 are not provided, that is, the transverse bars 13 and the vertical bars 14 are projected onto the plane where the frames 12 and 16 are located to form a rectangular cross grid, each grid of the rectangular cross grid is a rectangular hole, and all the rectangular holes constitute a gap area.

[0036] like Figure 4 As shown, the outer periphery of the rectangular frame 12 and the outer periphery of the concave frame 16 are provided with scale lines 17, and the scale lines 17 are used to adjust the distance between adjacent horizontal bars 13 and adjacent vertical bars 14 to adjust the size of the gap area. The scale lines 17 are non-top scale lines, that is, a blank segment is left before the zero scale line of the scale lines 17, and the zero scale lines of the scale lines 17 coincide with the inner edges of the rectangular frame 12 / the inner edges of the concave frame 16 respectively.

[0037] The size of the rectangular frame 12 and the size of the concave frame 16 are determined according to the size and blockage ratio of the building wind tunnel.

[0038] The width of the horizontal baffle 13 and the width of the vertical baffle 14 are both the same fixed width.

[0039] The transverse baffles 13 and the vertical baffles 14 have various length specifications. The lengths of the transverse baffles 13 and the vertical baffles 14 are determined according to the size of the rectangular frame 12 and the size of the concave frame 16 .

[0040] The wind direction angle of the wind tunnel test is 0°~90°, and the wind direction angle is the angle between the wind direction and the out-of-plane direction of the rectangular frame 12 (i.e., the vertical direction). When the wind direction is perpendicular to the rectangular frame 12, the wind direction angle is 0°, and when the wind direction is parallel to the rectangular frame 12, the wind direction angle is 90°.

[0041] Embodiment 1:

[0042] The use of the device is now described by taking a specific test process as an example.

[0043] like Figure 1-Figure 4 As shown, the specific steps of the perforated plate wind tunnel test are as follows:

[0044] 1) A steel partition plate 3 and a round wooden board 7 with a square through slot 6 in the center are fixed above the wind tunnel turntable 2 at the bottom of the building wind tunnel 1 through a plurality of steel screws 4 and a plurality of wooden rods 8 respectively, and a force measuring balance 5 is placed on the steel partition plate 3 after passing through the square through slot 6.

[0045] 2) Place the test body square aluminum plate 11 on the upper surface of the force measuring balance 5, and at the same time, use bolts to fix the two interference body square aluminum plates 15 to the round wood board 7 respectively. Then weld the rectangular frame 12 and the concave frame 16 to the test body square aluminum plate 11 and the interference body square aluminum plate 15 respectively. Use the magnetic attraction principle to adsorb multiple horizontal baffles 13 and multiple vertical baffles 14 on the surface of the rectangular frame 12 and the concave frame 16 to form a perforated plate model. In the specific implementation, the hole forming result is changed by changing the relative position relationship between adjacent baffles 13 and 14, and the porosity of the perforated plate model is quantitatively measured by referring to the scale lines 17 on the outer periphery of the rectangular frame 12 and the scale lines 17 on the outer periphery of the concave frame 16.

[0046] 3) Rotate the wind tunnel turntable 2 to conduct wind tunnel tests at different wind direction angles under three-way stress conditions, analyze the stress data of the perforated plate model collected by the force balance 5, and provide a basis for the wind resistance design of perforated plates with different porosity ratios.

[0047] In the present device, a plurality of transverse baffles 13 and a plurality of vertical baffles 14 are respectively adsorbed on the frames 12 and 16. The transverse baffles 13 and the vertical baffles 14 are projected onto the plane where the frames 12 and 16 are located to form a rectangular cross grid. Each grid of the rectangular cross grid is a rectangular hole slot. The rectangular cross grid is the hole-forming result of the perforated plate model. The porosity can be determined by the relative area relationship between the rectangular hole slot and the frames 12 and 16. Each transverse baffle 13 and each vertical baffle 14 has different length specifications and a fixed width. A scale line 17 is provided on the rectangular frame 12 and the concave frame 16. The porosity of the perforated plate model can be quantitatively measured according to the scale on the scale line 17. If the hole-forming result needs to be changed, the transverse baffle 13 and the vertical baffle 14 only need to be moved in parallel to change the relative position relationship between the adjacent baffles 13 and 14. In addition, the hole-forming result can be quickly changed by adding or reducing the transverse baffle 13 or the vertical baffle 14. The perforated plate model with different porosity can be obtained by different hole-forming results.

[0048] Typically, the transverse baffles 13 and the vertical baffles 14 are arranged simultaneously to form rectangular holes. The transverse baffles 13 and the vertical baffles 14 can also be arranged selectively to form strip holes arranged at intervals, thereby obtaining a perforated plate model with different gap forms.

[0049] Therefore, the present invention can utilize the simple movement or increase or decrease of the baffle bars 13 and 14 to quickly change the hole-forming result of the perforated plate model, and utilize the scale line 17 to quantitatively measure the void ratio, thereby obtaining perforated plate models with different void ratios and void forms.

[0050] The perforated plate model is mainly composed of a test body perforated frame 9 and an interference body perforated frame 10, which can simulate two working conditions: one without considering the surrounding interference and the other with considering the surrounding interference. When only the test body perforated frame 9 is installed, the surrounding interference is not considered; when the interference body perforated frame 10 is installed for wind tunnel testing, the difference in the results of the two can be compared to consider the surrounding interference.

Claims

1. A perforated plate wind tunnel test device capable of quickly adjusting porosity, characterized in that: The invention comprises a fixed component and a perforated plate model, wherein the perforated plate model is located on the fixed component, and a force balance (5) in the fixed component is connected to the perforated plate model; the fixed component comprises a steel partition plate (3), a steel screw rod (4), a force balance (5), a round wooden board (7) and a wooden pole (8); a steel partition plate (3) coaxial with the wind tunnel turntable (2) is provided above the wind tunnel turntable (2) at the bottom of the building wind tunnel (1); the outer periphery of the steel partition plate (3) and the inner periphery of the wind tunnel turntable (2) are fixedly connected by a plurality of steel screw rods (4). A circular wooden board (7) coaxial with the steel partition (3) is provided above the circular steel partition (3); the outer periphery of the circular wooden board (7) and the outer periphery of the wind tunnel turntable (2) are fixedly connected by a plurality of wooden rods (8); a square through slot (6) is provided in the center of the circular wooden board (7); a force measuring balance (5) is placed on the upper surface of the steel partition (3); the top of the force measuring balance (5) passes through the square through slot (6) and is connected to the perforated plate model; the upper surface of the force measuring balance (5) is flush with the upper surface of the circular wooden board (7); The perforated plate model comprises a test body perforated frame (9), an interference body perforated frame (10), a transverse blocking bar (13) and a vertical blocking bar (14); the test body perforated frame (9) is connected to the interference body perforated frame (10) via a fixing component; The test body perforated frame (9) comprises a test body square aluminum plate (11) and a rectangular frame (12), the test body square aluminum plate (11) is placed parallel to the round wooden board (7) and located above the middle of the square through slot (6), the test body square aluminum plate (11) is placed on the upper surface of the force measuring balance (5), the rectangular frame (12) is a flat plate frame, the bottom end of the rectangular frame (12) is welded to the upper surface in the middle of the test body square aluminum plate (11), a plurality of horizontal retaining bars (13) are adsorbed on one surface of the rectangular frame (12), and a plurality of vertical retaining bars (14) are adsorbed on the other surface of the rectangular frame (12); The interference body perforated frame (10) comprises two interference body square aluminum plates (15) and a concave frame (16), the two interference body square aluminum plates (15) are fixedly mounted on the upper surface of the round wooden board (7) by bolts, the two interference body square aluminum plates (15) are respectively located on both sides of the test body square aluminum plate (11), and there is a gap between the interference body square aluminum plate (15) and the test body square aluminum plate (11), the concave frame (16) is an inverted concave flat plate frame, and two convex structures at the bottom of the concave frame (16) are respectively welded to the two interference body square aluminum plates (15), a plurality of horizontal retaining bars (13) are adsorbed on one surface of the concave frame (16), and a plurality of vertical retaining bars (14) are adsorbed on the other surface of the concave frame (16); The rectangular frame (12) and the concave frame (16) are in the same plane, the rectangular frame (12) is located in the concave part of the concave frame (16), and there is a gap between the concave frame (16) and the rectangular frame (12).

2. A perforated plate wind tunnel testing device capable of rapidly adjusting porosity according to claim 1, characterized in that: The transverse baffles (13) and the vertical baffles (14) are both made of iron, the rectangular frame (12) and the concave frame (16) are both made of magnets, a plurality of transverse baffles (13) are arranged at intervals along the height direction of the rectangular frame (12), each transverse baffle (13) is arranged along the width direction of the rectangular frame (12), a plurality of vertical baffles (14) are arranged at intervals along the width direction of the rectangular frame (12), and each vertical baffle (14) is arranged along the height direction of the rectangular frame (12); The rectangular frame (12) and the concave frame (16) are rectangular holes at locations where the transverse blocking bars (13) and the vertical blocking bars (14) are not provided.

3. The perforated plate wind tunnel testing device capable of rapidly adjusting porosity according to claim 1, characterized in that: The outer periphery of the rectangular frame (12) and the outer periphery of the concave frame (16) are both provided with scale lines (17), the scale lines (17) being used to adjust the distance between adjacent transverse blocking bars (13) and between adjacent vertical blocking bars (14), the scale lines (17) being non-top scale lines, and the zero scale lines of the scale lines (17) respectively coincide with the inner edges of the rectangular frame (12) / the inner edges of the concave frame (16).

4. The perforated plate wind tunnel testing device capable of rapidly adjusting porosity according to claim 1, characterized in that: The size of the rectangular frame (12) and the size of the concave frame (16) are both determined according to the size and blockage ratio of the building wind tunnel.

5. The perforated plate wind tunnel testing device capable of rapidly adjusting porosity according to claim 1, characterized in that: The width of the transverse blocking bar (13) and the width of the vertical blocking bar (14) are both the same fixed width. The transverse baffle (13) and the vertical baffle (14) have a variety of length specifications. The length of the transverse baffle (13) and the length of the vertical baffle (14) are determined according to the size of the rectangular frame (12) and the size of the concave frame (16).

6. The perforated plate wind tunnel testing device capable of rapidly adjusting porosity according to claim 1, characterized in that: The wind direction angle of the wind tunnel test is 0°~90°, and the wind direction angle is the angle between the wind direction and the out-of-plane direction of the rectangular frame (12).

Images