A sand and dust generating device that can be manually controlled in a wind tunnel

Abstract

The present invention relates to a sand and dust raising device that can be manually controlled in a wind tunnel, and the device includes a flexible panel, a main frame structure, a liftable main beam, a liftable secondary beam, and a front horizontal extension component. A front horizontal extension component is provided at one end of the main frame structure, a liftable main beam is provided at the other end, and a liftable secondary beam is provided in the middle; a flexible panel is provided on the liftable main beam and the liftable secondary beam, one end of the flexible panel is connected to the front horizontal extension component, and the other end is provided with a rear natural swing component; a pair of brake rollers is provided at one end of the bottom of the main frame structure, and a pair of rollers is provided in the middle of the bottom surface. The present invention has a simple structure, high test efficiency, saves time and labor, improves the efficiency of the test and the accuracy of the research, and can realize the artificial control of the speed and height of sand or dust raising in wind and sand flow and dusty environment.

Description

Technical Field

[0001] The invention relates to the technical field of artificial simulation and control of environmental conditions in a wind tunnel, and in particular to a sand and dust generating device which can be artificially controlled in a wind tunnel. Background Art

[0002] Wind tunnel is a tool for studying aerodynamics. It is a pipe-shaped experimental device that can artificially generate and control airflow, measure the effect of airflow on objects, and observe physical phenomena. It is also a device used to simulate the flow and changing characteristics of gas around objects. Through the wind tunnel experimental platform, we can measure the force on objects in the flowing airflow, observe the physical phenomena generated between them, and then study and explore the wind dynamic characteristics and effects of objects, providing strong data support and scientific and technological guarantee for further optimizing design and production practice.

[0003] With the development of social economy and the progress of science and technology, wind tunnel construction technology has been improved day by day. Various types of wind tunnels have emerged one after another and have been widely used in various industries to study and simulate the fluid mechanics characteristics of objects under wind environment conditions. Since the environment required for the test is artificially controllable, environmental wind tunnels have played an important role in promoting scientific research such as environmental governance and pollutant prevention and control. At present, with the in-depth promotion of my country's work on desertification prevention and control, wind and sand fixation, and wind and sand disaster control, in order to more deeply understand and explore the characteristics and dynamic mechanisms of wind and sand flow, wind and sand environmental wind tunnels have been applied. Since wind tunnel tests do not require large-scale experimental research in the field and are highly efficient, wind and sand environmental wind tunnels have received more and more attention in the configuration of farmland shelterbelts, wind and sand disaster prevention and control measures, and the research and development of new wind and sand fixation materials, and have become an indispensable research equipment platform.

[0004] Wind tunnels in wind and sand environments can be used to simulate wind and sand flows and sandstorms. There are two main methods. One is to install a sand trough at the front end of the wind tunnel test section, inject quicksand into the sand trough, and let the quicksand leak naturally under the action of gravity, and then form a wind and sand flow or a sandstorm under the action of wind; the other method is relatively simple, directly covering the test section with sand, forming a sand layer in the test section according to a certain thickness and length of the covering sand, which is used to simulate the wind and sand flow formed by the underlying surface of the quicksand. Although these two methods are feasible, they both have certain disadvantages in the actual simulation of the wind and sand flow environment: in the former method, quicksand must be continuously injected into the sand trough installed on the top, which requires a lot of manpower and material resources. At the same time, how to more accurately control the amount of quicksand leakage under different wind speed conditions is also a difficulty; in the latter method, there is a certain limitation on the research object to be eroded by the wind and sand flow. The wind and sand flow mainly occurs within 20cm near the surface. The saturated wind and sand flow within 20cm accounts for more than 90% of the near-surface sand transport. Therefore, above 20cm, as the height increases, the proportion of sand transport is negligible. If the research object is small, within 20cm, it can be fully eroded and coerced by the wind and sand flow. However, if the scale of the research object is larger than 20cm, or larger, it cannot be fully eroded by the wind and sand flow, or the research object is unevenly coerced by the wind and sand flow or eroded by sand and dust. This direct sand covering method is limited, and the research results obtained will be incomplete or inaccurate.

[0005] Therefore, designing and building a good sand and dust raising device in a wind tunnel for a sandstorm environment is a key factor in improving the accuracy and reliability of wind tunnel research for a sandstorm environment. During the design process, it is necessary to ensure that the sand flow and dust environment conditions in a near-natural state can be well simulated, and the scale of the sand flow and dust environment can be increased as much as possible to expand the research scope. Only in this way can the bottleneck of simulating the sandstorm environment in the current wind tunnel for a sandstorm environment be solved and the accuracy of the research in the wind tunnel for a sandstorm environment be improved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a sand and dust generating device which can be manually controlled in a wind tunnel and can effectively improve test efficiency and research accuracy.

[0007] In order to solve the above problems, the present invention describes a sand and dust raising device which can be manually controlled in a wind tunnel, and is characterized in that: the device includes a flexible panel, a main frame structure, a liftable main beam, a liftable secondary beam and a front end horizontal extension component; the front end horizontal extension component is provided at one end of the main frame structure, the liftable main beam is provided at the other end, and the liftable secondary beam is provided in the middle; the flexible panel is provided on the liftable main beam and the liftable secondary beam, one end of the flexible panel is connected to the front end horizontal extension component, and the other end is provided with a rear end natural swing component; a pair of brake rollers is provided at one end of the bottom of the main frame structure, and a pair of rollers is provided in the middle of the bottom surface.

[0008] Slidable holes and grooves I are respectively provided on both sides of the connection between the flexible panel and the front horizontal extension component, and a fixed hole and groove are provided on the front horizontal extension component; the fixed hole and groove are connected to the flexible panel through bolts I via the slidable hole and groove I.

[0009] Slidable holes and grooves II are provided on both sides of the flexible panel where it is connected to the liftable main beam and the liftable secondary beam respectively. The slideable holes and grooves II are connected to the liftable main beam and the liftable secondary beam respectively through bolts II.

[0010] The liftable main crossbeam comprises a pair of lift support rods Ⅰ and a crossbeam Ⅰ connected by the pair of lift support rods Ⅰ; the pair of lift support rods Ⅰ are provided with adjustable hole slots Ⅰ, and the adjustable hole slots Ⅰ are connected with an adjustable main knob.

[0011] The liftable auxiliary crossbeam comprises a pair of lift support rods II and a crossbeam II connected by the pair of lift support rods II; the pair of lift support rods II are provided with adjustable hole slots II, and the adjustable hole slots II are connected with an adjustable auxiliary knob.

[0012] The main frame structure is connected to the front horizontal extension member via fixing bolts.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. In the present invention, sliding holes are provided on both sides of the connection between the flexible panel and the front horizontal extension component, the liftable main beam, and the liftable auxiliary beam, thereby realizing the overall translation of the flexible panel.

[0015] 2. In the present invention, flexible panels are provided on the liftable main crossbeam and the liftable auxiliary crossbeam. Therefore, the flexible panels can realize up and down movement and height adjustment between various parts in contact with the main frame structure, so that each part has a reasonable panel length and curvature, thereby adjusting the saturation distance generated by the wind and sand flow.

[0016] 3. The present invention is provided with a liftable main beam and a liftable auxiliary beam. Therefore, the height of the flexible panel can be changed by vertically lifting the horizontal beam, thereby realizing artificial control to raise the horizontal erosion height of the wind and sand flow and dust, and then effectively controlling the erosion direction of the wind and sand flow to meet the test design and requirements; at the same time, the characteristics of the wind and sand flow in a near-natural state can be simulated by adjusting and extending the distance of the windward surface.

[0017] 4. A pair of brake rollers is provided at one end of the bottom of the main frame structure in the present invention, and a pair of rollers is provided in the middle of the bottom surface thereof. Therefore, the present invention can be moved forward and backward inside the wind tunnel body, thereby adjusting the erosion distance of the saturated wind and sand flow, which not only realizes the mobility of the sand and dust raising equipment in the wind tunnel, but also expands the scale of the wind and sand test in the wind tunnel.

[0018] 5. The flexible panel of the present invention is provided with a natural swinging component at the rear end, which can produce instantaneous up and down swing and pulsation effects, thereby simulating the wind and sand flow stress effect and dust environment conditions in a near-natural state.

[0019] 6. The present invention has a simple structure, high test efficiency, saves time and labor, improves the efficiency of the test and the accuracy of the research, and can realize artificial control of the speed and height of sand or dust in wind and sand flow and dust environment, thereby providing reliable scientific research equipment support for directional research on the physiological and biochemical response mechanism of plants or an object under the erosion stress of wind and sand flow or in dust environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is the front view of the present invention.

[0023] Figure 3 The figure is the moving position and force diagram of the flexible panel in the present invention.

[0024] Figure 4 It is a schematic diagram of the liftable main beam in the present invention.

[0025] Figure 5 This is a schematic diagram of the wind and sand flow stress test conducted in a wind tunnel according to the present invention.

[0026] In the figure: 1—flexible panel; 2—liftable main beam; 21—lifting support rod Ⅰ; 22—beam Ⅰ; 23—adjustable hole slot Ⅰ; 3—rear end natural swing component; 41—sliding hole slot Ⅰ; 42—sliding hole slot Ⅱ; 5—adjustable main knob; 6—brake roller; 7—main frame structure; 8—adjustable sub knob; 9—roller; 10—fixing bolt; 11—front end horizontal extension component; 12—fixing hole slot; 131—bolt Ⅰ; 132—bolt Ⅱ; 14—liftable sub beam; 141—lifting support rod Ⅱ; 142—beam Ⅱ. DETAILED DESCRIPTION

[0027] like Figures 1 to 4 As shown, a sand and dust generating device which can be manually controlled in a wind tunnel comprises a flexible panel 1, a main frame structure 7, a liftable main beam 2, a liftable secondary beam 14 and a front end horizontal extension component 11.

[0028] A front end horizontal extension component 11 is provided at one end of the main frame structure 7, a liftable main beam 2 is provided at the other end, and a liftable secondary beam 14 is provided in the middle; a flexible panel 1 is provided on the liftable main beam 2 and the liftable secondary beam 14, one end of the flexible panel 1 is connected to the front end horizontal extension component 11, and the other end is provided with a rear end natural swing component 3; a pair of brake rollers 6 are provided at one end of the bottom of the main frame structure 7, and a pair of rollers 9 are provided in the middle of the bottom surface.

[0029] Wherein: sliding holes and grooves Ⅰ41 are respectively provided on both sides of the joint between the flexible panel 1 and the front horizontal extension component 11, and a fixed hole and groove 12 is provided on the front horizontal extension component 11; the fixed hole and groove 12 is connected to the flexible panel 1 through the sliding hole and groove Ⅰ41 by a bolt Ⅰ131 that can be smoothly compacted, so that the front edge of the flexible panel 1 is tightly fitted with the wall of the wind tunnel, and it expands and contracts back and forth with the front horizontal extension component 11 to ensure that the wind and sand flow is fully developed and saturated.

[0030] Slidable holes and grooves Ⅱ42 are provided on both sides of the flexible panel 1 where it is connected to the main crossbeam 2 and the auxiliary crossbeam 14, respectively. The slidable holes and grooves Ⅱ42 are connected to the main crossbeam 2 and the auxiliary crossbeam 14 through bolts Ⅱ132 that can be smoothly compacted. The height of the main and auxiliary crossbeams is adjusted, and the distance of the flexible panel 1 is moved forward and backward through the slidable holes and grooves Ⅱ42, and the length and curvature of the flexible panel 1 are adjusted to generate a suitable wind and sand flow erosion height, thereby raising the wind and sand flow and dust erosion height, and then adjusting the wind and sand flow erosion direction.

[0031] The liftable main crossbeam 2 includes a pair of lift support rods Ⅰ21 and a crossbeam Ⅰ22 connected by the pair of lift support rods Ⅰ21; the pair of lift support rods Ⅰ21 are provided with adjustable holes Ⅰ23, and the adjustable holes Ⅰ23 are connected to the adjustable main knob 5.

[0032] The liftable auxiliary crossbeam 14 includes a pair of lift support rods Ⅱ141 and a crossbeam Ⅱ142 connected by the pair of lift support rods Ⅱ141; the pair of lift support rods Ⅱ141 are provided with adjustable holes Ⅱ, and the adjustable holes Ⅱ are connected to the adjustable auxiliary knobs 8.

[0033] The main frame structure 7 is connected to the front horizontal extension member 11 by fixing bolts 10, and can be freely stretched in the horizontal direction to adjust the distance between the main frame structure 7 so that the front edge of the flexible panel 1 placed thereon can fit tightly to the ground surface.

[0034] The rear end natural swinging component 3 is made of soft material, such as cloth, plastic, etc., and is in the shape of long strips or strips. It is evenly dispersed along the rear edge of the flexible panel 1 and tightly attached to the rear edge of the flexible panel 1. It can swing with the wind to simulate the characteristics of wind and sand flow in a near-natural state.

[0035] The material of the flexible panel 1 can be selected from stainless steel sheets, aluminum-plastic panels, glass fiber panels, PE panels, various plastics and other materials that are bendable and have a certain degree of toughness.

[0036] Embodiment: The present invention was used in 2018 in the wind tunnel of the Gansu Institute of Sand Control to study the physiological and biochemical response mechanism of xerophytes in a sand environment.

[0037] During the test, if Figure 5 As shown, first, a sand layer of about 5 to 6 meters long is covered in the wind tunnel test section, and then the present invention is placed at the rear of the test section, about 1 to 2 meters away from the sand layer; then, the plant body with the flower pot that has been cultivated is placed 20 to 30 cm away from the rear end of the present invention; secondly, the height of the flexible panel 1 is adjusted by the liftable main beam 2 and the liftable auxiliary beam 14 to make it in a suitable position; finally, the wind tunnel is turned on and adjusted to the sand-raising wind speed, and sand particles can be observed to be blown up along the flexible panel 1 by the wind. At this time, the erosion distance of the wind and sand flow on the plant can be adjusted by moving the present invention forward and backward, and the distance and upper and lower positions of the flexible panel 1 at different parts of the main frame structure 7 can also be adjusted by adjusting the spacing between the sliding hole slot Ⅰ41 and the sliding hole slot Ⅱ42, thereby adjusting the distance and position of the suitable saturated wind and sand flow.

Claims

1. A sand and dust generating device that can be manually controlled in a wind tunnel, characterized in that: The device comprises a flexible panel (1), a main frame structure (7), a liftable main crossbeam (2), a liftable secondary crossbeam (14) and a front horizontal extension component (11); the front horizontal extension component (11) is arranged at one end of the main frame structure (7), the liftable main crossbeam (2) is arranged at the other end, and the liftable secondary crossbeam (14) is arranged in the middle; the flexible panel (1) is arranged on the liftable main crossbeam (2) and the liftable secondary crossbeam (14); one end of the flexible panel (1) is connected to the front horizontal extension component (11), and the other end is provided with a rear natural swing component (3); a pair of brake rollers (6) is arranged at one end of the bottom of the main frame structure (7), and a pair of rollers (9) is arranged in the middle of the bottom surface; the rear natural swing component (3) is made of soft material, in the shape of a long strip or a strip, evenly dispersed along the rear edge of the flexible panel (1), and tightly attached to the rear edge of the flexible panel (1), and can swing with the wind to simulate the characteristics of a wind and sand flow in a near-natural state.

2. The sand and dust generating device that can be manually controlled in a wind tunnel as claimed in claim 1, characterized in that: Slidable slots I (41) are respectively provided on both sides of the junction between the flexible panel (1) and the front horizontal extension component (11), and a fixing slot (12) is provided on the front horizontal extension component (11); the fixing slot (12) is connected to the flexible panel (1) via a bolt I (131) through the slidable slot I (41).

3. The sand and dust generating device that can be manually controlled in a wind tunnel as claimed in claim 1, characterized in that: Slidable holes and grooves II (42) are provided on both sides of the flexible panel (1) where it is connected to the liftable main crossbeam (2) and the liftable secondary crossbeam (14), and the slideable holes and grooves II (42) are connected to the liftable main crossbeam (2) and the liftable secondary crossbeam (14) respectively via bolts II (132).

4. The sand and dust generating device that can be manually controlled in a wind tunnel as claimed in claim 1, characterized in that: The liftable main crossbeam (2) comprises a pair of lift support rods I (21) and a crossbeam I (22) connected via the pair of lift support rods I (21); the pair of lift support rods I (21) are provided with adjustable holes I (23), and the adjustable holes I (23) are connected to an adjustable main knob (5).

5. The sand and dust generating device that can be manually controlled in a wind tunnel as claimed in claim 1, characterized in that: The liftable secondary crossbeam (14) comprises a pair of lift support rods II (141) and a crossbeam II (142) connected via the pair of lift support rods II (141); the pair of lift support rods II (141) are provided with adjustable hole slots II, and the adjustable hole slots II are connected to an adjustable secondary knob (8).

6. The sand and dust generating device that can be manually controlled in a wind tunnel as claimed in claim 1, characterized in that: The main frame structure (7) is connected to the front horizontal extension component (11) via fixing bolts (10).

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