A snowfall device applied to an environmental wind tunnel

Abstract

The present application provides a kind of snow drifting device applied to environmental wind tunnel, belong to the technical field of wind tunnel test equipment research.The purpose is to solve the problem of poor uniformity, low particle size control precision, easy to block, space size restriction in prior art.In the present application, mist droplet generation section, mixing section and snow treatment section are connected in sequence to form a wind tunnel;fan array, cooler and two-phase nozzle are installed in mist droplet generation section from bottom to top, mist droplet inlet and water inlet are communicated with two-phase nozzle through mist droplet water inlet pipe branch and mist droplet air inlet pipe branch respectively;screening snow grid is provided at the connection of mixing section and snow treatment section, snow sweeping mechanism is installed above screening snow grid, brush driving motor output is connected with driving shaft through reducer, and brush is provided on driving shaft;snow bearing net and movement mechanism are installed below screening snow grid.The present application solves the problem of poor uniformity, low particle size control precision, easy to block, space size restriction in prior art.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel testing equipment research technology, and in particular relates to a snow drifting device applied to environmental wind tunnels. Background Technology

[0002] With the booming development of the ice and snow economy, snow simulation technology in environmental wind tunnels has also spawned different types of branches. Among them, ground blowing snow simulation and aerial natural snowfall simulation have the most applications. Ground blowing snow simulation, which is applied in the field of rail transit, has a lower threshold and more mature technology because it can directly utilize natural snow on the ground. However, aerial natural snowfall simulation is technically difficult and its development is relatively slow because it needs to realistically reproduce the state of natural snowfall. This is mainly reflected in poor snowfall uniformity, low precision in controlling snow particle size, and limited application height, which seriously restricts the development of environmental wind tunnel snowfall simulation technology and snowfall test technology.

[0003] In recent years, there has been an increasing number of studies on simulating natural snowfall using environmental wind tunnels. Researchers are developing snowfall devices to try to reproduce the natural snowfall environment, in order to extract more accurate experimental data under snowfall conditions and develop the ability of environmental wind tunnels to simulate and test snowfall.

[0004] Currently, snowmaking devices in traditional environmental wind tunnels, limited by the small space of the test section, mostly employ cooling-based ice-shaving snowmaking and vibration-based natural snowmaking to simulate natural snowfall. However, the former results in ice fragments accumulating into blocks due to heat generated by the friction of the ice blades during the snow-shaving process; the latter causes the snow crystals to compact into blocks during the natural snow accumulation process. Both ice fragment accumulation and snow crystal compaction lead to inconsistent snow particle size and uneven snowfall during the snowmaking process, severely affecting the quality of snowfall and resulting in a significant difference between the actual simulation effect and the real state of natural snowfall. In some environmental wind tunnels with large test section spaces, snowmaking simulation uses small snowmaking machines (guns) or two-phase nozzles. The former has even worse overall snowfall uniformity and more uneven snow particle distribution, failing to reproduce the state of natural snowfall; the latter requires a larger snowfall height due to the influence of water vapor pressure and two-phase heat exchange, making it unsuitable for most environmental wind tunnels.

[0005] In summary, there is an urgent need to design a snow drift device for use in environmental wind tunnels to solve the problems of poor snow drift uniformity, low particle size control accuracy, easy agglomeration, and spatial size constraints in existing technologies, so as to realistically reproduce the natural snow drift state and improve the technical foundation for snow drift simulation and snow drift test in environmental wind tunnels. Summary of the Invention

[0006] A brief overview of the invention is given below to provide a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0007] In view of this, in order to solve the problems of poor snow uniformity, low particle size control accuracy, easy agglomeration, and spatial size constraints in the existing technology, the present invention provides a snow-falling device for use in environmental wind tunnels.

[0008] Solution: A snow-blowing device for use in an environmental wind tunnel, comprising a mist droplet generation section, a mixing section, and a snow treatment section;

[0009] The mist droplet generation section, mixing section and snow treatment section are connected in sequence to form a wind tunnel;

[0010] The droplet generating section is equipped with a fan array, a cooler and a two-phase nozzle in sequence from bottom to top. The droplet air inlet pipe and the droplet water inlet pipe are connected to the two-phase nozzle through the droplet air inlet pipe branch pipe and the droplet water inlet pipe branch pipe, respectively.

[0011] A snow sieving grid is provided at the connection between the mixing section and the snow treatment section. A snow sweeping mechanism is installed above the snow sieving grid. The snow sweeping mechanism includes a brush drive motor, a reducer, a drive motor mounting base, a drive shaft, and a brush. The drive motor mounting base is installed on the outer wall of the snow treatment section. The brush drive motor is installed on the drive motor mounting base. The output end is connected to the drive shaft through the reducer. The drive shaft passes through the snow treatment section and is equipped with a brush.

[0012] A snow-collecting net is installed below the snow-screening grid. The motion mechanism is installed on the outer wall of the snow treatment section and includes a hydraulic cylinder mounting seat, a hydraulic cylinder, a linear mechanism, and a motion plate. The hydraulic cylinder is fixed to the outer wall of the snow treatment section through the hydraulic cylinder mounting seat. The lower end of the hydraulic cylinder is connected to the motion plate through the linear mechanism. The motion plate passes through the outer wall of the snow treatment section and is connected to the inner snow-collecting net.

[0013] Furthermore, the water inlet pipe and air inlet pipe of the mist droplets are equipped with shrouds.

[0014] Furthermore, the hybrid section is arched.

[0015] Furthermore, the motion mechanism also includes a damping spring mounting base and a damping spring. The damping spring mounting base is installed on the outer wall of the snow treatment section, and the damping spring is installed on the damping spring mounting base and abuts against the motion plate.

[0016] Furthermore, the motion board is flexibly connected to the snow treatment section via a flexible connecting canvas, and the flexible connecting canvas moves in tandem with the motion board.

[0017] Furthermore, the wind turbine array is mounted on the mist droplet generating section via a wind turbine array support frame.

[0018] The present invention has the following advantages over the prior art:

[0019] 1. This invention significantly improves the realism of snowfall simulation in environmental wind tunnels, avoiding problems such as snow accumulation and compaction from the source. It effectively improves the defects of traditional devices, such as ice clumping and low snowfall quality, making the simulation effect closer to the real snowfall state in nature and providing a reliable foundation for high-precision environmental simulation tests.

[0020] 2. This invention achieves high-precision control of snowfall uniformity and snow particle size, solving key problems such as inconsistent snow particle size and uneven distribution in traditional devices, and significantly improving the accuracy of snowfall test data and the reliability of test results;

[0021] 3. The device in this invention requires a low snowfall height, breaking through the strict limitations of traditional snowfall devices on the height of the test section. It is compatible with more environmental wind tunnel platforms of different specifications, greatly expanding the applicability and application scenarios of the device, and effectively solving the problem that snowfall technology was difficult to promote and apply due to height limitations in the past.

[0022] 4. This invention aligns with the current development trend of ice and snow economy and environmental simulation technology, meets the urgent needs of scientific research, rail transit, disaster prevention and mitigation in the ice and snow field for realistic snowfall environment simulation, has strong technical practicality and wide applicability, and has good promotion value and broad industrial application prospects. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of a snow drift device used in an environmental wind tunnel; the arrows indicate the direction of movement of the mist droplets.

[0025] Figure 2 This is a side view of the section where the mist-like droplets are generated.

[0026] Figure 3 This is a top view of the wind turbine array.

[0027] In the diagram: 1-Fan array, 2-Cooler, 3-Atomized droplet air inlet pipe, 4-Atomized droplet water inlet pipe, 5-Rectifier, 6-Two-phase nozzle, 7-Atomized droplet generating section, 8-Mixing section, 9-Brush drive motor, 10-Reducer, 11-Drive motor mounting base, 12-Drive shaft, 13-Brush, 14-Snow sieve grid, 15-Snow treatment section, 16-Sliding end, 17-Hydraulic cylinder mounting base, 18-Hydraulic cylinder, 19-Damping spring mounting base, 20-Flexible connecting canvas, 21-Damping spring, 22-Linear mechanism, 23-Moving plate, 24-Snow net, 25-Atomized droplet water inlet pipe branch, 26-Atomized droplet air inlet pipe branch, 27-Cooler inlet, 28-Cooler outlet, 29-Fan array support frame. Detailed Implementation

[0028] To make the technical solutions and advantages of the embodiments of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] Examples, References Figures 1-3 This embodiment describes a snow-blowing device applied in an environmental wind tunnel, comprising a mist droplet generating section 7, a mixing section 8, and a snow treatment section 15;

[0030] The mist droplet generating section 7, the mixing section 8, and the snow treatment section 15 are connected in sequence to form a wind tunnel;

[0031] The droplet generating section 7 is equipped with a fan array 1, a cooler 2 and a two-phase nozzle 6 from bottom to top. The droplet air inlet pipe 3 and the droplet water inlet pipe 4 are connected to the two-phase nozzle 6 through the droplet air inlet pipe branch pipe 26 and the droplet water inlet pipe branch pipe 25, respectively.

[0032] A snow-screening grid 14 is provided at the connection between the mixing section 8 and the snow treatment section 15. A snow-sweeping mechanism is installed above the snow-screening grid 14. The snow-sweeping mechanism includes a brush drive motor 9, a reducer 10, a drive motor mounting base 11, a drive shaft 12, and a brush 13. The drive motor mounting base 11 is installed on the outer wall of the snow treatment section 15. The brush drive motor 9 is installed on the drive motor mounting base 11. The output end is connected to the drive shaft 12 through the reducer 10. The drive shaft 12 passes through the snow treatment section 15 and is connected to the sliding end 16 at the other end. A brush 13 is provided on the drive shaft 12.

[0033] A snow-collecting net 24 is installed below the snow-screening grid 14. The motion mechanism installed on the outer wall of the snow-processing section 15 includes a hydraulic cylinder mounting seat 17, a hydraulic cylinder 18, a linear mechanism 22, and a motion plate 23. The hydraulic cylinder 18 is fixed to the outer wall of the snow-processing section 15 through the hydraulic cylinder mounting seat 17. The lower end of the hydraulic cylinder 18 is connected to the motion plate 23 through the linear mechanism 22. The motion plate 23 passes through the outer wall of the snow-processing section 15 and is connected to the inner snow-collecting net 24.

[0034] Furthermore, the water inlet pipe branch 25 and the air inlet pipe branch 26 of the mist droplets are equipped with a shroud 5 to ensure uniform airflow.

[0035] Furthermore, the hybrid segment 8 is arched.

[0036] Furthermore, the motion mechanism also includes a damping spring mounting base 19 and a damping spring 21. The damping spring mounting base 19 is mounted on the outer wall of the snow treatment section 15, and the damping spring 21 is mounted on the damping spring mounting base 19 and abuts against the motion plate 23. Through damping, the control sensitivity of the hydraulic cylinder 18 is improved.

[0037] Furthermore, the motion board 23 is flexibly connected to the snow treatment section 15 via a flexible connecting canvas 20, and the flexible connecting canvas 20 moves in coordination with the motion board 23.

[0038] Furthermore, the wind turbine array 1 is mounted on the mist droplet generating section 7 via the wind turbine array support frame 29.

[0039] Furthermore, the cooler 2 is provided with a cooler inlet 27 and a cooler outlet 28. Coolant enters through the cooler inlet 27 and exits through the cooler outlet 28 to achieve cooling of the cooler 2.

[0040] The working principle and usage process of this invention are as follows:

[0041] S1. The airflow from the fan array 1 is cooled by the cooler 2 to form a cooling airflow. The cooling airflow performs convective forced heat exchange on the mist droplets ejected by the two-phase nozzles 6. The mist droplets enter the mixing section 8 from the mist droplet generating section 7 for further subcooling, which promotes the initial condensation of the mist droplets into crystals.

[0042] S2. After the mist droplets initially condense into crystals, they enter the snow treatment section 15 from the mixing section 8 and fall into the snow screening grid 14 to form a snow crystal accumulation. The brush 13 sweeps the snow crystals on the snow screening grid 14 at different rates to control the snow crystal accumulation rate and prevent the snow crystals from clumping together, which would affect the snow quality.

[0043] S3. After the crystal snow on the snow screening grid 14 falls into the snow collecting net 24, the hydraulic cylinder 18 drives the linear mechanism 22 to reciprocate at different amplitudes and frequencies. The linear mechanism 22 makes the snow collecting net 24 linked through the motion plate 23, and controls the snow intensity and snow particle size by reciprocating vibration amplitude and vibration frequency.

[0044] The blowing pattern of S4. Wind turbine array 1 can achieve airflow zone control, further adjust the snowfall intensity, and improve the uniformity of snowfall.

[0045] This invention significantly improves the realism of snowfall simulation in environmental wind tunnels, preventing problems such as snow crystal accumulation and compaction from the source. It effectively improves the defects of traditional devices, such as ice clumping and low snowfall quality, making the simulation effect closer to the real snowfall state in nature and providing a reliable foundation for high-precision environmental simulation tests. At the same time, it achieves high-precision control of snowfall uniformity and snow particle size, solving key problems such as inconsistent snow particle size and uneven distribution in traditional devices, and significantly improving the accuracy of snowfall test data and the reliability of test results.

[0046] The device of this invention requires a low snowfall height, breaking through the strict limitations of traditional snowfall devices on the height of the test section. It is compatible with more environmental wind tunnel platforms of different specifications, greatly expanding the applicability and application scenarios of the device, and effectively solving the problem that previous snowfall technologies were difficult to promote and apply due to height limitations. At the same time, it conforms to the current development trend of ice and snow economy and environmental simulation technology, meeting the urgent needs of scientific research, rail transportation, disaster prevention and mitigation in the ice and snow field for realistic snowfall environment simulation. The technology is highly practical, applicable to a wide range of scenarios, and has good promotion value and broad prospects for industrial application.

[0047] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A snow-blowing device for use in an environmental wind tunnel, characterized in that, It includes a mist droplet generation section (7), a mixing section (8), and a snow treatment section (15); The mist droplet generation section (7), mixing section (8) and snow treatment section (15) are connected in sequence to form a wind tunnel; The droplet generating section (7) is equipped with a fan array (1), a cooler (2) and a two-phase nozzle (6) from bottom to top. The droplet air inlet pipe (3) and the droplet water inlet pipe (4) are connected to the two-phase nozzle (6) through the droplet air inlet pipe branch pipe (26) and the droplet water inlet pipe branch pipe (25), respectively. A snow sieve grid (14) is provided at the connection between the mixing section (8) and the snow treatment section (15). The snow sweeping mechanism is installed above the snow sieve grid (14). The snow sweeping mechanism includes a brush drive motor (9), a reducer (10), a drive motor mounting base (11), a drive shaft (12), and a brush (13). The drive motor mounting base (11) is installed on the outer wall of the snow treatment section (15). The brush drive motor (9) is installed on the drive motor mounting base (11). The output end is connected to the drive shaft (12) through the reducer (10). The drive shaft (12) passes through the snow treatment section (15). The drive shaft (12) is provided with a brush (13). A snow-collecting net (24) is installed below the snow-screening grid (14). The motion mechanism is installed on the outer wall of the snow treatment section (15) and includes a hydraulic cylinder mounting seat (17), a hydraulic cylinder (18), a linear mechanism (22), and a motion plate (23). The hydraulic cylinder (18) is fixed to the outer wall of the snow treatment section (15) through the hydraulic cylinder mounting seat (17). The lower end of the hydraulic cylinder (18) is connected to the motion plate (23) through the linear mechanism (22). The motion plate (23) passes through the outer wall of the snow treatment section (15) and is connected to the inner snow-collecting net (24).

2. The snow-blowing device for use in an environmental wind tunnel according to claim 1, characterized in that, The water inlet pipe (25) and air inlet pipe (26) of the mist droplets are equipped with shrouds (5).

3. The snow-blowing device for use in an environmental wind tunnel according to claim 1, characterized in that, The mixed section (8) is arched.

4. The snow-blowing device for use in an environmental wind tunnel according to claim 1, characterized in that, The motion mechanism also includes a damping spring mounting base (19) and a damping spring (21). The damping spring mounting base (19) is installed on the outer wall of the snow treatment section (15), and the damping spring (21) is installed on the damping spring mounting base (19) and abuts against the motion plate (23).

5. A snow-blowing device for use in an environmental wind tunnel according to claim 4, characterized in that, The motion board (23) is flexibly connected to the snow treatment section (15) via a flexible connecting canvas (20), and the flexible connecting canvas (20) moves in coordination with the motion board (23).

6. The snow-blowing device for use in an environmental wind tunnel according to claim 1, characterized in that, The wind turbine array (1) is mounted on the mist droplet generating section (7) via the wind turbine array support frame (29).

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