CN111855137B

CN111855137B - Many whirlwind whirlpools wind generating device of core radius adjustable

Info

Publication number: CN111855137B
Application number: CN201910825028.1A
Authority: CN
Inventors: 王浩; 张寒; 郎天翼; 徐梓栋
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2022-04-05
Anticipated expiration: 2039-11-13
Also published as: CN111855137A

Abstract

A multi-vortex tornado generating device with adjustable core radius is characterized in that a fixed hanging piece is used for connecting the top of an outer wall with an external structure, and a main air pipe is connected with the outer wall through a rotating device; one end of the horizontal air pipe is fixedly connected with the lower part of the main air pipe, and the other end is free; the horizontal sliding rails are respectively fixed at the lower parts of the horizontal air pipes and used for installing a one-way exhaust fan; the upper part of the vertical air pipe is fixedly connected with the main air pipe, and the lower part of the vertical air pipe is provided with a bidirectional exhaust fan; in the test, under the combined action of the rotating device and the exhaust fan, airflow rotates and rises to form a tornado-like wind field, the exhaust fan slides along the track in the radial direction to change the core radius of the wind field, and the vertical air pipe generates sinking airflow to simulate multi-vortex tornado. The device effectively makes up the defects that the conventional tornado simulator cannot change the core radius and simulate the multi-vortex tornado, and has good scientific research value and wide engineering application prospect.

Description

Many whirlwind whirlpools wind generating device of core radius adjustable

Technical Field

The invention relates to the field of tornado resistance of engineering structures, in particular to a multi-vortex tornado generating device with an adjustable core radius.

Background

Tornado is the most violent convection storm in the earth atmosphere, the maximum wind speed close to the ground can reach 170m/s, and the tornado belongs to the extreme weather phenomenon in nature. Tornado is also one of wind disasters, and the range of motion almost extends all over the world, bringing about serious disasters to human beings. The United states is the major world-wide area where tornadoes occur, and is commonly referred to as the "country of tornadoes". According to Wind Hazard Reduction judgment statistics, an average of 800-. Except the United states, Jianghuai and south China are also areas with relatively high Tornado. In 2015, in 10 months, tornado attacks areas such as Guangdong Fushan Shuiden and Guangzhou wine, and causes multi-person casualties and Guangzhou large-area electric network paralysis. In 2016, 23 months, 99 people die, 800 people are injured, 3000 more houses collapse, roads are blocked, communication and power grid facilities are seriously damaged, and crop loss is almost exhausted due to EF 4-level tornado (the maximum gust wind speed on the ground reaches 74-89 m/s) in Funing county of the Yangxu city in Jiangsu province. In 7 months in 2019, 2.8 million people are affected by the Liaoning primary tornado disaster, and the economic loss is heavy. With the acceleration of the modern construction process of the country, a large number of infrastructures which concern the countryside of China, such as civil houses, communication power facilities, large-span bridges, high-speed railway networks and the like, have been or are about to be constructed. Therefore, it is necessary to develop a research on the tornado resistance of the engineering structure to ensure the safety of the infrastructure under the action of the tornado, and the research has important significance for stabilizing the life of people and promoting the economic development.

The tornado is greatly different from the traditional strong/typhoon, and has the characteristics of small scale, complex wind field structure, high destructive power, high forecasting difficulty and the like. At present, the research on tornado mainly comprises several methods such as field actual measurement, numerical simulation, experimental simulation and the like. Due to the extremely strong destructive power and the occurrence randomness of the tornado, the actual measurement research usually needs to pay high cost, and sufficient data information is difficult to obtain. With the rapid development of computer technology and the rapid formation of a Computational Fluid Dynamics (CFD) commercial solver, a group of scholars in the wind engineering field gradually develop tornado numerical simulation studies, establish a numerical model of the structure, and study the mode of action of tornado on the engineering structure. However, the mechanism of tornado generation and development is still unclear, and the related control equation cannot be established and applied to CFD, and the result is not ideal and the accuracy is uncertain.

In view of the difficulties of actual measurement research and numerical simulation of tornadoes, since the 70 s of the last century, experimental simulation became the mainstream trend of tornadoes research. In the 80 th century, until now, with the design and construction of tornado simulators such as WindEEE, VorTECH and the like, numerous scholars conducted experimental studies on tornados, and studied tornado load and related effects by theoretically analyzing and exploring tornado flow field structures and placing structural models in experimental devices, so as to obtain great results. However, more deep studies show that the core radii of different tornadoes are different greatly, and the wind field is generally in a multi-vortex form when the tornadoes occur, which is exactly opposite to the current widely-used single-vortex and fixed-core-radius test wind field. Therefore, a special tornado generating device is needed, so that the core radius of the wind field is adjustable, the multi-vortex tornado wind field can be simulated, the multi-working-condition wind field simulation can be developed, and the test result has higher reference value.

Disclosure of Invention

In order to solve the defect that the conventional tornado simulator cannot change the core radius and simulate the multi-vortex tornado, the multi-vortex tornado generating device with the adjustable core radius is adopted to develop the test simulation of a tornado field closer to the real condition, so that the test result is more reliable.

The invention relates to a multi-vortex tornado generating device with adjustable core radius, which comprises a model platform and a tornado generating device, wherein the area of the model platform is larger than the vertical projection area of the device; the horizontal air pipe is provided with a horizontal sliding rail below and is used for installing an one-way exhaust fan, the main air pipe is connected with a vertical air pipe below, and the two-way exhaust fan is installed on the lower portion of the vertical air pipe. The unidirectional exhaust fan can move radially through the horizontal sliding rail.

The air flow at the lower part of the unidirectional exhaust fan driving device rises, the rising air flow enters the cavity of the cylindrical outer wall through the horizontal air pipe and the main air pipe, finally returns to the lower part of the device, and is driven to rise by the unidirectional exhaust fan again, thereby forming an air flow closed loop, ensuring the quality of an air field, saving energy and reducing noise.

The unidirectional exhaust fan can move radially through the horizontal sliding rail, so that the core radius of the wind field can be adjusted. The bidirectional exhaust fan at the lower part of the vertical air pipe can generate ascending and descending air flows, single-vortex-cyclone can be simulated when the ascending air flow is generated, and the bidirectional exhaust fan and the unidirectional exhaust fan can act together to simulate multi-vortex-cyclone when the descending air flow is generated.

The model platform area is greater than the vertical projection area of device to place large-span structure model, and reserve a plurality of bolts or rivet hole sites, with the test model of fixed difference, or place coarse first influence to the tornado with the simulation topography.

In order to further improve the flexibility of the test, the power of the driving motors of the rotating device and the exhaust fan is continuously adjustable, and the simulation of the tornado wind field with different axial wind speeds and tangential wind speeds can be met.

The main air pipe and the horizontal air pipe have higher material strength and uniformity, so that the main air pipe and the horizontal air pipe can bear larger centrifugal force in the rotating process, and the safe test is ensured.

The upper part of the main air pipe is connected with the rotating device, the lower part of the main air pipe is connected with the horizontal air pipe and the vertical air pipe, and the horizontal slide rails are respectively and fixedly connected with the lower part of the horizontal air pipe and used for installing the one-way exhaust fan; the two-way exhaust fan is arranged at the lower part of the vertical air pipe, during a test, under the combined action of the rotating device and the one-way exhaust fan, airflow at the lower part of the device rotates and rises to form a tornado field, the one-way exhaust fan slides along the radial direction of the rail to change the core radius of the tornado field, and the two-way exhaust fan generates sinking airflow to simulate multi-vortex tornado in the vertical air pipe. The invention has clear structure and flexible use, can form closed loops of ascending and descending airflow, ensures the stability of the wind field, effectively saves energy and reduces noise, can develop multi-working-condition tornado wind field simulation, and has good scientific research value and wide engineering application prospect.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

FIG. 2 is a top view of the apparatus of the present invention;

FIG. 3 is a cross-sectional view of the apparatus 1-1 of the present invention;

FIG. 4 is a connection diagram of the main air duct and the rotary device of the present invention;

FIG. 5 is a view showing the arrangement of the bottom of the horizontal air duct of the apparatus of the present invention;

FIG. 6 is a schematic view of the apparatus of the present invention simulating the operation of a single-vortex tornado field;

FIG. 7 is a schematic view of the apparatus of the present invention simulating the operation of a multi-vortex tornado farm;

the figure shows that: the device comprises a central shaft 1, a fixed hanging piece 2, a main air pipe 3, a rotating device 4, a rotating device fixing part 4-1, a rotating device rotating part 4-2, a horizontal air pipe 5, a folding shed windshield 5-1, a wind shield rigid end ruler 5-2, a horizontal sliding rail 6, a vertical air pipe 7, a one-way exhaust fan 8, a cylindrical outer wall 9 with a cavity, a two-way exhaust fan 10 and a model platform 11.

Detailed Description

The multi-vortex-dragon wind generating device with the adjustable core radius is symmetrical about a central shaft 1 and comprises a fixed hanging piece 2, a main air pipe 3, a rotating device 4, a horizontal air pipe 5, a horizontal sliding rail 6, a vertical air pipe 7, a one-way exhaust fan 8, a cylindrical outer wall 9 with a cavity, a two-way exhaust fan 10 and a model platform 11; the fixed hanging piece 2 fixedly connects the top of the outer wall 9 with an external structure; the main air pipe 3 is connected with the outer wall 9 through a rotating device 4; one end of the horizontal air pipe 5 is fixedly connected with the lower part of the main air pipe 3, and the other end is free; the horizontal sliding rails 6 are respectively and fixedly connected to the lower parts of the horizontal air pipes 5 and are used for installing unidirectional exhaust fans 8; the upper part of the vertical air pipe 7 is fixedly connected with the main air pipe 3, and the lower part is provided with a bidirectional exhaust fan 10; the model platform 11 is arranged at the bottom of the device and used for placing the structural model. The overall structure of the device is shown in figure 1.

As shown in fig. 4, the main air duct 3 is fixedly connected with the rotating part 4-2 of the rotating device; the rotating device fixing part 4-1 is fixedly connected with the outer wall 9. When the rotating device 4 works, the main air duct 3 and the lower structure thereof can be driven to rotate around the central shaft 1.

As shown in figure 5, the bottom surface of the horizontal air pipe 5 is a bellows windshield 5-1, and the outer wall of the unidirectional exhaust fan 8 is connected with a rigid end ruler 5-2 of the windshield. The bellows windshield 5-1 is made of an airtight material and can freely stretch along the direction of the horizontal slide rail 6 so as to ensure the air tightness of the horizontal air pipe 5 when the unidirectional exhaust fan 8 moves.

The whole device is fixed on an external structure through the fixed hanging piece 2, a power supply and a controller are connected to the rotating device 4, the horizontal sliding rail device 6, the one-way exhaust fan 8 and the two-way exhaust fan 10, whether the device works normally or not is checked, and the device is installed after debugging is successful.

According to actual requirements, the test model is fixed at a proper position of the model platform 11, and the test can be started after the test model is confirmed to be correct.

In the test, the unidirectional exhaust fan 8 is adjusted to different positions of the horizontal slide rail 6, so that the tornado wind fields with different core radiuses can be simulated. The tornado wind fields with different axial speeds and tangential speeds can be simulated by adjusting the rotating speeds of the rotating device 4, the unidirectional exhaust fan 8 and the bidirectional exhaust fan 10.

As shown in fig. 6, when the single-vortex tornado is simulated, the rotating device 4 and the unidirectional exhaust fan 8 are normally turned on, the bidirectional exhaust fan 10 is adjusted to be in an air suction mode, the fans simultaneously generate ascending air flows, the lower part of the device forms low pressure, the peripheral air flows are converged to the center and are in a rotating ascending state under the driving of the rotating device 4, and therefore the single-vortex tornado is simulated.

As shown in fig. 7, when the multi-vortex-dragon wind is simulated, the rotating device 4 and the one-way exhaust fan 8 are normally opened, the two-way exhaust fan 10 is adjusted to be in the blowing mode to generate down-flow, under the action of the one-way exhaust fan 8, the air flow is converged and ascends towards the lower part of the device from the periphery, the down-flow generated by the two-way exhaust fan 10 enables the central pressure of the device to be larger, the periphery converged air flow does not move towards the center any more, the down-flow is turned to be up-flow in contact with the bottom and converged up-flow, and then rotates to ascend, and the multiple strands of converged air flow rotate to ascend to form a multi-vortex field, so that the multi-vortex-dragon wind is simulated.

The above description is merely a preferred example, and those skilled in the art can make appropriate changes and modifications to the embodiments in light of the disclosure. The present invention is not limited to the above-described embodiments, and variations and modifications are included in the scope of the claims, and the terms used in the present invention are merely for convenience of description and do not limit the present invention in any way.

Claims

1. The utility model provides a many whirlpools of core radius adjustable tornado generating device, includes the model platform, tornado generating device, its characterized in that: the tornado generating device is characterized in that a fixed hanging piece (2) is arranged on the circular top surface, the periphery of the circular top surface is a cylindrical outer wall (9), a main air pipe (3) is connected with the outer wall (9) through a rotating device (4), and a horizontal air pipe (5) is connected to the lower end of the main air pipe (3) and extends horizontally in four directions; a horizontal sliding rail (6) is arranged below the horizontal air pipe and used for installing a one-way exhaust fan (8), a vertical air pipe (7) is connected below the main air pipe (3), and a two-way exhaust fan (10) is installed on the lower portion of the vertical air pipe (7).

2. The multi-vortex wind generating device with adjustable core radius of claim 1, wherein: the unidirectional exhaust fan (8) can move radially through the horizontal sliding rail (6).

3. The multi-vortex wind generating device with adjustable core radius of claim 1, wherein: the area of the model platform (11) is larger than the vertical projection area of the device.

4. The multi-vortex wind generating device with adjustable core radius of claim 1, wherein: the fixed hanging piece is arranged on the round top surface in a cross mode.