CN203837898U - Dust devil simulation platform - Google Patents

Abstract

The utility model discloses a dust devil simulation platform which comprises a fan, a bracket supporting the fan, a working table, and a smoke tracing system. The fan is disposed above the working table. The smoke tracing system is disposed in a cavity of the working table, and is provided with a smoke generator for generating smoke and a linear laser light source. According to the dust devil simulation platform of the utility model, tangential air supply is not needed, the device structure is simple, and physical images are clear and intuitive. The smoke tracing system of the device irradiates on smoke through the laser light source, air flow inside a cyclone can be observed, the dust devil phenomenon is made more intuitive, and the ornamental value is increased.

Description

Dust devil simulation platform

technical field

The utility model relates to an experiment simulation device, in particular to a dust devil simulation platform.

Background technique

A dust devil is a small whirlwind generated by the strong heating of the ground, and is characterized by rolling up dust and light objects on the ground to form a rotating dust column. We can often observe "little tornadoes" in the streets or alleys or open spaces in summer afternoons, which are dust devils. But dust devils are different from the tornadoes we are familiar with. First of all, in terms of scale, tornadoes generally have a height of a thousand kilometers and a diameter of hundreds of meters, while dust devils are only a few hundred meters high and a diameter of tens of meters. to one meter high. Secondly, the physical generation mechanism of the two is also very different. The tornado is mainly caused by the violent rotation of the air caused by the sharp change of the airflow in the lower layer of the storm cloud, and the generation process is from top to bottom. The dust devil is a special rotating convective movement formed by the local heating of the ground that causes the air to rise due to heating, and it is bottom-up. During the formation of dust devils, the peripheral air is heated by the ground through the thin layer close to the ground and then flows to the central part. The rotational energy of the peripheral air is strengthened in the central part to form dust devils. The rotational energy is the original rotational energy of the hot bubbles. It is formed by the local concentration of energy and the conversion of a part of potential energy, and its rotation direction is determined by the initial rotation direction of the heat convection bubble. The generation process is mainly divided into the following four steps:

a) The dry ground heats up sharply due to continuous sunlight;

b) air near the surface is heated and rises creating a low pressure area in the heated center;

c) The air around the low pressure area starts to flow radially due to the pressure difference;

d) Due to the slight disturbance of the external environment, the dust devil is formed as shown in Figure 1 as the updraft accelerates and rotates.

There are currently no known platforms or instruments on the market to simulate "dust devils". The design principles of the existing "dust devil demonstrator" with similar purposes mainly include three types: 1. Use the air extractor or blower to draw or blow air upwards, and at the same time use the surrounding columns to provide tangential airflow, forcing the airflow to rotate Thus, a simulated "dust devil" is generated; 2. The vertical airflow is generated in the same way, and a rotating disk is used instead to generate a rotating airflow; 3. The airflow direction is changed by using the wind deflector to generate a cyclone. The disadvantages of these three methods of generating simulated "dust devils" are: using mechanical or design structures to artificially introduce tangential force to force the airflow to rotate. However, this method does not conform to the principle of "dust devils" or "dust devils" in nature, and can only be simulated from the phenomenon but not from the principle. In addition, the existing similar demonstrator cannot observe the internal structure of the cyclone.

Utility model content

Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a dust devil simulation platform, which simulates the dust devil by using the dust devil generation principle, and observes the air flow inside the cyclone through a line laser light source Condition.

Technical solution: In order to solve the above technical problems, a dust devil simulation platform of the present invention includes a fan, a bracket supporting the fan, a workbench and a smoke tracing system, the fan is located above the workbench, and the smoke tracer The smoke tracing system is located in the cavity of the workbench, and the smoke tracing system has a smoke generator that generates smoke and a line laser light source.

Preferably, the workbench is in the shape of a cylinder, with a cylindrical non-through hole on the top, several small holes on the bottom of the cylindrical non-through hole, and a polycarbonate plate with several honeycomb small holes inside the cylindrical non-through hole.

Preferably, the support includes a horizontal support and a vertical support, the horizontal support is fixedly installed on the vertical support, and the fan is located on the horizontal support and directly above the cylindrical hole.

Preferably, the vertical support is provided with a plurality of mounting holes, and the horizontal support is connected with the vertical support by inserting screws into the mounting holes, and the height of the fan can be adjusted by adjusting the installation position of the horizontal support on the vertical support.

Preferably, the fan is also connected with a pressure regulator.

In this utility model, the "dust devil" generation mechanism basically conforms to the actual laws of nature, mainly manifested in the following aspects:

a) The duration and occurrence period are similar to those of natural dust devils;

b) The geometric size and movement form are similar to those of natural dust devils;

c) Under certain conditions, two cyclones with different rotation directions can be observed, and there is a certain probability of observing the phenomenon that multiple rotations exist at the same time.

Beneficial effects: Compared with the prior art, the dust devil simulation platform of the present utility model has the following advantages:

1. There is no tangential air supply, the device is simple in structure, and the physical image is clear and intuitive;

2. The smoke tracer system can observe the air flow inside the cyclone, and the dust devil phenomenon is more intuitive and increases its ornamental value.

Description of drawings

Figure 1 is a schematic diagram of the generation of dust devils;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is a schematic diagram of the generation principle of the dust tornado in the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 2, a dust devil simulation platform of the present utility model includes a fan 3, a bracket 2 supporting the fan 3, a workbench 1 and a smoke tracer system 4, the fan 3 is located above the workbench 1, and the smoke tracer The tracking system 4 is located in the cavity of the workbench 1, the workbench 1 is in the shape of a cylinder, and the top is provided with a cylindrical non-through hole, and a polycarbonate plate with several honeycomb holes is arranged in the cylindrical non-through hole, and the support 2 includes The horizontal support 21 and the vertical support 22, the horizontal support 21 is fixedly installed on the vertical support 22, the fan 3 is located on the horizontal support 21 and is located directly above the cylindrical hole, the vertical support 22 is provided with a plurality of mounting holes, and the horizontal support 21 passes through The screw is inserted into the mounting hole and connected with the vertical support 22, and the smoke tracer system 4 has a smoke generator and an in-line laser light source for producing smoke.

In the utility model, the bracket 2 is made of aluminum profiles, and the bracket 2 for supporting the fan 3 is built by using the 30*30 aluminum profiles that are easy to assemble and disassemble, and the height of the fan 3 is adjusted by using the detachable horizontal support 21 structure of the upper fixed fan 3; Table 1 is a cylindrical structure with a diameter of 80cm and a height of 100cm. The main body is a wooden structure with a small door on the side. The interior is used to place the smoke generator. The top is a cylindrical hole with a diameter of 20cm. The polycarbonate plate with small holes simulates the dry ground and provides a working plane for the generation and activity of dust devils. The 10cm space below the polycarbonate plate is isolated from other parts and serves as a smoke buffer zone. The smoke generated by the smoke generator passes through the bottom of the space The small hole enters the buffer zone and then overflows through the small hole on the polycarbonate plate to make the "dust devil" visible. The smoke buffer space in the center of the platform can eliminate the influence of the initial velocity of smoke ejection on the simulation experiment.

The axial flow fan 3 adopts a fan 3 with a voltage of 220V and a power of 370W. The fan 3 draws air vertically upwards, simulating the rising of the ground air, and uses a 500W voltage regulator to adjust the speed of the fan 3 to achieve the effect of adjusting the flow rate of the upward airflow; the smoke generator is used to generate The smoke simulates the natural dust to make the dust devil easy to observe. The inline laser light source is used to observe the cross-sectional flow field of the generated dust devil by means of the scattering of the laser light by the smoke.

In the present utility model, as shown in Figure 3, the strong upward airflow produced by the axial flow fan 3 is used to simulate the upward movement of the airflow caused by thermal convection under natural conditions, the dust is simulated by smoke, and the cyclone section is irradiated by a laser light source, the phenomenon is intuitive and obvious ; There is no tangential air supply, the height and speed of the fan 3 are continuously adjustable, and dust devils of different sizes and shapes can be generated, and the design is based on the law of dust devils in nature. The device is simple and flexible, easy to adjust and can be used for a variety of purposes. It is not only an excellent demonstration instrument, but also convenient to add experimental related measurement systems and data acquisition systems to conduct a variety of different experimental explorations. It can also be used as a classroom or exhibition hall. Demo instrument.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (5)

1. a dust devil analog platform, it is characterized in that: the support (2), worktable (1) and the smog tracing system (4) that comprise blower fan (3), support blower fan (3), described blower fan (3) is positioned at the top of worktable (1), described smog tracing system (4) is positioned at the cavity of worktable (1), and smog tracing system (4) has the aerosol producer and the word line laser light source that produce smog.

2. dust devil analog platform according to claim 1, it is characterized in that: described worktable (1) is cylindrical shape, top is provided with cylinder blind hole, and cylinder blind hole bottom is provided with several apertures, is provided with the polycarbonate plate that has several cellular apertures in cylinder blind hole.

3. dust devil analog platform according to claim 2, it is characterized in that: described support (2) comprises horizontal support (21) and perpendicular support (22), horizontal support (21) is arranged on that perpendicular to support (22) upper, blower fan (3) be positioned at horizontal support (21) upper and be positioned at cylinder blind hole directly over.

4. dust devil analog platform according to claim 3, is characterized in that: described perpendicular support (22) is provided with multiple mounting holes, and horizontal support (21) is inserted in mounting hole and is connected with perpendicular support (22) by screw.

5. dust devil analog platform according to claim 1, is characterized in that: described blower fan (3) is also connected with pressure regulator.