CN111141477A

CN111141477A - Space wind source array tornado generating device based on intelligent control

Info

Publication number: CN111141477A
Application number: CN202010035820.XA
Authority: CN
Inventors: 王浩; 郎天翼; 张寒; 徐梓栋
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-05-12

Abstract

The invention discloses a space wind source array tornado generating device based on intelligent regulation, which comprises an axial flow fan, a servo motor, a rotating platform, a supporting frame, an exhaust fan, a flow limiting plate, a wind speed monitoring system and an intelligent regulation system. The axial flow fan is fixed on the rotary platform and is driven by the servo motor to form an adjustable speed air source; the rotary platforms are fixed on the support frame and are arranged circumferentially and arrayed in the vertical direction. The axial flow fan positioned at the lower part of the supporting frame blows high-speed airflow to the central area of the device, the incident angle is controlled by the rotating platform, the airflow rotates, and the airflow rises under the action of the top exhaust fan; the axial flow fan positioned at the upper part of the supporting frame blows low-speed airflow to the central area, so that the high-speed airflow is prevented from diverging, the high-speed airflow is kept in a rotating and rising state, and the tornado is formed. The invention has the characteristic of modularization of each component, can be flexibly arranged according to different fields, and the formed wind field environment has no size limitation so as to meet the requirements of anti-tornado tests of different engineering structures.

Description

Space wind source array tornado generating device based on intelligent control

Technical Field

The invention relates to a tornado generating device based on an intelligently controlled space wind source array, in particular to an open type tornado generating device combining intelligent control and component modularization, belonging to the field of tornado resistance of engineering structures.

Background

Tornado is an extreme strong convection weather, which often occurs in wide plain areas, extreme weather such as hail and rainstorm is often accompanied around the core area of a wind field, the destructive power is strong, and the average economic loss caused each year is up to hundreds of billions of dollars. The damage of the tornado to the building structure is different from other strong winds, the tornado has strong three-dimensional flow field characteristics, and the stress form of the building is complex under the action of the tornado, so that the development of research on the tornado is very important work.

The united states establishes a system for most comprehensively recording tornado events in the world, and the united states has a special department, namely the National Weather Service (NWS), which is responsible for paying attention to weather changes and providing disaster weather early warning, and can release tornado early warning information nationwide. The early warning of the tornadoes does not accurately find and judge the arrival of the tornadoes, but judges the scale and the area of the tornadoes which are possibly formed in advance before the tornadoes are formed. And because the existing detection instrument has insufficient sensitivity to accurately predict the tornado, the disaster assessment work of the tornado is carried out after disaster, and meanwhile, the technical standard of tornado resistance does not exist.

Wind tunnel tests are an important means for studying wind engineering. There are two basic types of tornado wind tunnel test devices, commonly referred to as tornado simulators, Ward-type and ISU-type. On the basis of this, many researchers have developed the development of tornado simulators. However, these tornado simulators are implemented by controlling air flow circulation in a closed space or a semi-closed space, and there is no scientific research idea and simulation device for performing experiments in an open space. Traditional tornado simulator volume is big, occupies a large amount of spaces, in case the assembly is perfect, the later stage is very difficult to remove and dismantle.

Disclosure of Invention

The invention aims to overcome the defects of the conventional tornado simulator in wind field parameter exploration and flexible arrangement, break through the limitation of heavy volume and difficulty in moving of the conventional simulator, and provide the tornado simulator based on intelligent regulation, open space and visual wind field so as to be used for engineering experiment research.

In order to achieve the purpose, the method adopted by the invention is as follows: a space wind source array tornado generating device based on intelligent regulation comprises a wind source device, a supporting frame, an exhaust fan, a current-limiting plate, a wind speed monitoring system and an intelligent regulation system; the wind source devices are circumferentially arranged on the support frame and arrayed in a vertical direction; the flow limiting plate and the exhaust fan are arranged at the top of the supporting frame, the air source device comprises an axial flow fan, the axial flow fan arranged at the lower part of the supporting frame is used for blowing high-speed air flow into the central area of the device, and the axial flow fan positioned at the upper part of the supporting frame blows low-speed air flow into the central area to prevent the high-speed air flow from diverging; the high-speed airflow blown by the axial flow fan rises under the action of the exhaust fan; and the spirally rising air flow is discharged along a designated path through the flow limiting plate and the exhaust fan.

As an improvement of the invention, the wind source device further comprises a fan fixing platform, a rotating platform, a servo motor and a stepping motor, wherein the fan fixing platform is connected to the supporting frame, and the axial flow fan is fixed on the rotating platform and driven by the servo motor; the rotating platform is controlled by a stepping motor to rotate and is fixed on the fan fixing platform.

As an improvement of the invention, the wind speed monitoring system is used for collecting wind speed data and comprises a synchronizer, a CCD camera, a laser and a computer.

As an improvement of the invention, the intelligent regulation and control system comprises a computer, wherein the computer is connected with the servo motor and the stepping motor and sends a mechanical instruction to control the servo motor and the stepping motor.

As an improvement of the invention, an atomizer is arranged near the axial flow fan of the device, the atomizer is arranged behind the lower axial flow fan, and colored water vapor generated by the atomizer rises along with the rotation of air flow, so that the shape of the tornado is displayed.

The wind speed monitoring system adopts a Particle Image Velocimetry (PIV) to collect wind field information, and the system comprises: CCD camera, laser, synchronizer and computer. Firstly, a large amount of trace particles, namely small solid particles, are scattered in the device, and the small particles are driven to move by the movement of the air flow along with the generation of the wind field. And irradiating the wind field area to be measured by using a laser sheet light source, recording the positions of the particles by using a CCD high-speed camera, analyzing the image by using a computer, calculating the particle speed in the measured area, and finally obtaining the wind field speed.

The intelligent control system establishes a mapping relation between the wind speed data and the mechanical instruction of the intelligent control system, so that the wind field in the central area of the device quickly approaches the target tornado field. When a wind field is formed, the wind speed monitoring system collects wind speed data, the intelligent control system sends a mechanical instruction to the servo motor and the stepping motor, the incident angle and the wind speed of the axial fan are adjusted, the wind field in the center area of the device continuously approaches a target wind field, and finally artificial tornadoes are formed in the center of the device.

Has the advantages that:

the device disclosed by the invention is completely exposed in a natural environment, the experimental devices are mutually independent, and each component has the characteristic of modularization and is not limited by site factors. In some closed spaces, building conditions can be used to generate artificial tornadoes, such as in buildings interiors, between floors of a suspended ceiling. The flexible arrangement is carried out according to different test environments and conditions, and the requirements of engineering experiments are met.

Drawings

FIG. 1 is a general schematic view of a tornado generating device of the present invention;

FIG. 2 is a flow chart of the intelligent regulation system and the wind field monitoring system;

FIG. 3 is a cross-sectional view of the gas flow outlet;

FIG. 4 is an axial fan adjustment device;

FIG. 5 is a cross-sectional view of an axial fan and a horizontal wind field;

reference numerals:

1. the device comprises a supporting frame 2, a servo motor 3, an axial fan 4-1, a fan fixing platform 4-2, a rotating platform 4-3, a stepping motor 5, an atomizer 6, a synchronizer 7, tracer particles 8, a CCD camera 9, a laser 10, a computer 11, a flow limiting plate 12, a honeycomb plate 13 and an exhaust fan.

Detailed Description

The invention provides a tornado generating device based on an intelligently controlled space wind source array.A mapping relation is established between wind speed data and a mechanical instruction by an intelligent control system, so that a wind field in a central area of the device is quickly close to a target tornado field, and the efficiency and the precision of simulating the tornado are improved. Meanwhile, the closed or semi-closed form of the existing simulator is changed, so that the space is open, and the adaptability of the experimental device is improved.

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.

The invention mainly comprises four parts, the first part is the main structure of the generation space of the tornado, and comprises a steel frame 1, an axial flow fan 3, an atomizer 5, a current limiting plate 11, a honeycomb plate 12 and an exhaust fan 13, and the parts form the basic elements formed by a wind field.

The axial flow fan 3 is fixed on the rotary platform 4-2 and driven by the servo motor 2. The rotary platform 4-2 is controlled by a stepping motor 4-3 to rotate and is fixed on the fan fixing platform 4-1. The fan fixing platform 4-1 is fixed on the steel frame 1 by bolts. The axial flow fan 3, the rotary platform 4-2, the servo motor 2 and the stepping motor 4-3 form a group of devices of an air source, the air source devices are circumferentially arranged and arrayed in a vertical direction, and the fan fixing platform 4-1 is connected to the supporting frame 1. The top of the supporting frame 1 is provided with a flow limiting plate 11 and an exhaust fan 13, the servo motor 2 drives the exhaust fan 13, the lower part of the exhaust fan 13 is provided with a honeycomb plate 12, and the edge of the honeycomb plate 12 is sealed by silica gel. An atomizer 5 is placed behind the axial flow fan 3 at the lower part of the device.

The second part is an intelligent regulation and control system which comprises an axial flow fan 3, a rotary platform 4-2, a stepping motor 4-3, a servo motor 2 and a computer 10.

The axial flow fan 3 is driven by the servo motor 2 and fixed on the rotary platform 4-2, the angle of the rotary platform 4-2 is controlled by the stepping motor 4-3, the rotary platform is fixed on the fan fixing platform 4-1, and the fan fixing platform 4-2 is fixed on the supporting frame 1 by bolts. The computer 10 is connected with the servo motor 2 and the stepping motors 4-3 and sends mechanical instructions to realize accurate control of the wind speed and the incident angle.

The third part is wind field collection system, utilizes Particle Image Velocimetry (PIV) technique to carry out transient state monitoring to the wind field, includes: a CCD camera 8, a laser 9, a synchronizer 6 and a computer 10. In operation, computer 10 connects synchronizer 6 to CCD camera 8, and synchronizer 6 connects laser 9 to CCD camera 8. In the operation process, tracer particles 7 are scattered in the device, a light sheet light source generated by a laser 9 is used for irradiating the area to be measured in the flow field, a CCD high-speed camera records the positions of the particles, then a computer analyzes images and calculates the particle speed in the area to be measured, and finally the wind field speed is obtained.

The fourth part is the monitoring and intelligent control process of the invention, namely the flow chart shown in fig. 2, and the target wind field is a corrected Rankine model, namely a plane vortex model. The corrected Rankine model describes the control factors of the tornadoes in the horizontal space, and a target wind field is set in the computer. The intelligent control system establishes a mapping relation between the collected wind speed data and the mechanical instruction, and continuously corrects the mechanical instruction to quickly approach the target wind field.

Although the present invention has been described in detail with reference to the above embodiments, details of the scheme may be supplemented and modified in accordance with differences in site environment factors when implemented on site. Additions and modifications to these details may be made without departing from the spirit and scope of the invention.

Claims

1. A space wind source array tornado generating device based on intelligent regulation is characterized by comprising a wind source device, a supporting frame (1), an exhaust fan (13), a current limiting plate (11), a wind speed monitoring system and an intelligent regulation system; the wind source devices are circumferentially arranged on the support frame (1) and arrayed in a vertical direction; the flow limiting plate (11) and the exhaust fan (13) are arranged at the top of the supporting frame (1), the air source device comprises an axial flow fan (3), the axial flow fan (3) arranged at the lower part of the supporting frame (1) is used for blowing high-speed air flow into the center area of the device, and the axial flow fan (3) positioned at the upper part of the supporting frame (1) blows low-speed air flow into the center area to prevent the high-speed air flow from dispersing; the high-speed airflow blown by the axial flow fan (3) rises under the action of the exhaust fan (13); and the spirally rising air flow is discharged along a designated path through a flow restriction plate (11) and an exhaust fan (12).

2. The tornado generating device based on intelligent control space wind source array of claim 1, which is characterized in that: the wind source device also comprises a fan fixing platform (4-1), a rotating platform (4-2), a servo motor (2) and a stepping motor (4-3), wherein the fan fixing platform (4-1) is connected to the supporting frame (1), and the axial flow fan (3) is fixed on the rotating platform (4-2) and driven by the servo motor (2); the rotating platform (4-2) is controlled by a stepping motor (4-3) to rotate and is fixed on the fan fixing platform (4-1).

3. The tornado generating device based on intelligent control space wind source array of claim 1, which is characterized in that: the wind speed monitoring system is used for collecting wind speed data and comprises a synchronizer (6), a CCD camera (8), a laser (9) and a computer (10).

4. The tornado generating device based on intelligent control space wind source array of claim 1, which is characterized in that: the intelligent regulation and control system comprises a computer (10), wherein the computer (10) is connected with a servo motor (2) and a stepping motor (4-3) and sends a mechanical instruction to control the servo motor and the stepping motor.

5. The intelligent regulation-based spatial wind source array tornado generating device according to claim 1, wherein an atomizer is arranged near the axial flow fan of the device, the atomizer (5) is arranged behind the lower axial flow fan (3), and colored water vapor generated by the atomizer (5) rises along with the rotation of air flow, so that the tornado shape is displayed.