CN-121977779-A - Fire whirlwind experimental apparatus of adjustable slit and real-time dynamic measurement

Abstract

The invention is suitable for the technical field of fire science experiments, and provides a fire cyclone experiment device with adjustable slits and real-time dynamic measurement. The fire cyclone main frame device drives the moving glass to move along the high-precision linear guide rail through the servo electric cylinder, and the dynamic sealing is ensured by adopting the L-shaped metal baffle plate. The electrical control console takes the PLC as a core and has a plurality of programmable operation modes. The real-time dynamic measurement bracket system can remotely adjust the spatial position of the sensor, and can be linked with the movable fire cyclone experiment table to realize automatic positioning and resetting. The invention solves the problems of the traditional device such as unadjustable slit, single air inlet mode, poor sealing performance, inconvenient operation and the like, and provides an experimental platform with high controllability and high repeatability for quantitative research of fire whirlwind.

Inventors

• LEI JIAO
• LIU NAIAN
• ZHANG LINHE
• SHI CHENCHEN
• HUANG PENGCHENG

Assignees

• 中国科学技术大学

Dates

Publication Date

20260505

Application Date

20260304

Priority Date

20260211

Claims (9)

1. 1. The utility model provides a fire whirlwind experimental apparatus of adjustable slit and real-time dynamic measurement, its characterized in that, adjustable slit and real-time dynamic measurement's fire whirlwind experimental apparatus includes: The fire cyclone main frame device (11) comprises an observation window formed by fixed glass (1) and movable glass (2), wherein the movable glass (2) is driven by a driving mechanism and is used for continuously adjusting the width of a vertical slit formed between adjacent movable glasses (2); The movable fire cyclone experiment table (10) is used for bearing fuel and measuring equipment and can be separated from one side wall body of the fire cyclone main frame to form an open working channel; The electric control console is used for controlling the driving mechanism and the movable fire cyclone experiment table (10) in a centralized manner; the real-time dynamic measurement bracket system is used for remotely adjusting the spatial distribution of the measurement sensor in the experimental process; The device controls the external annular quantity applied to the flame whirlwind by adjusting the width of the vertical slit, and synchronously acquires the multidimensional parameters of the combustion flow field through the real-time dynamic measurement bracket system.
2. 2. The adjustable slit and real time dynamic measurement fire cyclone experiment device of claim 1, wherein the driving mechanism comprises: the sliding block (9) is arranged on the high-precision linear guide rail (8), and the upper edge and the lower edge of the movable glass (2) are fixedly connected with the sliding block (9) through rigid connecting pieces; the servo motor cylinder (4), push rod (7) of servo motor cylinder (4) with the drive mechanism of slider (9) links to each other, is used for promoting slider (9) are along high accuracy linear guide (8) do straight reciprocating motion, control vertical slit width's regulation.
3. 3. The fire cyclone experiment device with adjustable slit and real-time dynamic measurement according to claim 1, wherein the fire cyclone main frame device (11) further comprises a sealing structure, the sealing structure comprises: an L-shaped metal baffle (6) which is arranged at the vertical joint of the fixed glass (1) and the movable glass (2) and at the horizontal joint of the movable glass (2) and the installation base of the sliding block (9); The L-shaped metal baffle plate (6) covers a gap on the moving track of the moving glass (2) and is used for dynamically keeping sealing along with the position of the moving glass (2).
4. 4. The fire cyclone experimental apparatus of the adjustable slit and the real-time dynamic measurement according to claim 1, wherein the movable fire cyclone experimental table (10) adopts an electric driving mode, moves at a speed of 10m/min, is completely separated from a side wall body of the fire cyclone main frame device (11), and forms an open type working channel with a width exceeding 1200 mm.
5. 5. The fire cyclone experimental apparatus for adjustable slit and real-time dynamic measurement according to claim 1, wherein the electrical control console uses a PLC as a core and has four programmable operation modes, including a simultaneous opening and closing mode, a single opening and closing mode, a layered opening and closing mode and a single-sided integral opening and closing mode.
6. 6. The adjustable slit and real-time dynamic measurement fire cyclone experimental device according to claim 1, wherein the real-time dynamic measurement bracket system comprises a structure capable of remotely adjusting the height and the radial position, and a conduit (5) fixed on a central axis, wherein the conduit (5) is used for installing and adjusting the spatial distribution of a thermocouple, a heat flow meter and a flow field speed sensor.
7. 7. The adjustable slit and real-time dynamic measurement fire cyclone experiment device according to claim 1, wherein the real-time dynamic measurement bracket system is linked with the mobile fire cyclone experiment table (10); When the movable fire cyclone experiment table (10) moves to an experiment position, triggering the vertical rod of the real-time dynamic measurement bracket system to automatically rotate to enter a measurement area; and after the experiment is finished, the movable fire cyclone experiment table (10) and the real-time dynamic measurement bracket system are reset by one key.
8. 8. The fire cyclone experimental device for adjustable slit and real-time dynamic measurement according to claim 1, wherein the fixed glass (1) and the movable glass (2) are made of 8mm toughened fireproof glass.
9. 9. The adjustable slit and real time dynamic measured fire cyclone experiment apparatus according to claim 1, wherein the measuring sensor comprises one or more of a pitot tube for measuring flow field velocity, a thermocouple array for measuring temperature distribution, and a heat flow meter for measuring radiant heat flow density.

Description

Fire whirlwind experimental apparatus of adjustable slit and real-time dynamic measurement Technical Field The invention belongs to the technical field of fire science experiments, and particularly relates to a fire cyclone experimental device with adjustable slits and real-time dynamic measurement. Background Fire whirlwind is an extreme fire behavior that may occur in forest fires, urban fires, and industrial fires, essentially a high temperature vortex structure formed by the coupling of flames with a strongly swirling airflow. The core hazard is extremely high energy concentration, compared with common diffusion flame, the flame temperature, the burning rate and the flame height of the flame cyclone are all increased in order of magnitude, and peripheral combustible materials can be accelerated to ignite, so that 'flying fire' is generated, and the uncontrolled expansion of a fire scene in a short time is caused. Therefore, the generation mechanism, the spreading rule and the energy release characteristic of the compound are revealed in a controlled laboratory, and the compound is a scientific premise for developing effective prevention and control technology. At present, a "natural induction type" device is often adopted in a laboratory, which guides air flow through a specific structure (such as a fixed slit) and naturally forms a rotating flow field by utilizing flame buoyancy. Among them, the four-sided wall-slit type device is widely used because of its simple structure and easy construction. However, the prior art solutions (such as replaceable plugboards) generally only provide a limited and discrete slit width setting, and must be manually preset before the experiment, so that continuous and dynamic control cannot be realized, and the air inlet mode is mostly fixed and symmetrical, so that it is difficult to simulate the asymmetric condition in a real fire. Meanwhile, the traditional device has the defects in the aspects of tightness, operation convenience, experimental condition repetition precision and measurement convenience, and is difficult to meet the requirements of quantitative and fine research. Disclosure of Invention The invention aims to provide a flame cyclone experimental device with adjustable slits and real-time dynamic measurement, and aims to solve the problems in the background technology. The invention is realized in such a way, and the flame whirlwind experimental device with adjustable slits and real-time dynamic measurement is used for quantitatively controlling the external circulation quantity through the independently adjustable vertical slits and dynamically measuring parameters such as the speed of the flow field, the temperature distribution, the radiation heat flow and the like in the flame whirlwind in real time. The device comprises a fire cyclone main frame device, a movable fire cyclone experiment table, an electric control table and a real-time dynamic measurement bracket system. The device directly and quantitatively controls the size and the distribution of the external annular quantity required by generating the fire cyclone by continuously and independently adjusting the width of the vertical slit of the four walls, synchronously acquires multidimensional data such as a fire cyclone flow field, temperature, heat flow and the like through a real-time dynamic measurement system, and provides a complete experimental platform for quantitative research and complex scene simulation of the fire cyclone. The main frame device of the fire cyclone forms a core cavity generated by the fire cyclone. The main body frame is formed by welding stainless steel sections, and the glass mounting substrate is formed by welding 304 stainless steel plates, so that the stability of the whole structure is ensured. The four-side observation window of the device is composed of fixed glass and movable glass, wherein the fixed glass and the movable glass are made of toughened fireproof glass with the thickness of 8 mm. By driving the horizontal displacement of the moving glass, the width of the vertical slit formed between adjacent moving glasses can be continuously adjusted, thereby controlling the air flow rate and the flow state entering the combustion zone. In this arrangement, the vertical slots are the only channels for external air to enter the combustion zone, forming a rotating flow field. The slit width directly determines the air intake area per unit height, and under the same external conditions, a wider slit allows more air (larger mass flow) to enter, and adjusting the slit width is equivalent to directly and quantitatively adjusting the external ring quantity applied to the fire cyclone. Specifically, the upper edge and the lower edge of the moving glass are fixedly connected with the sliding blocks arranged on the high-precision linear guide rail through rigid connecting pieces. The push rod of the servo electric cylinder is connected with the transmission mechanism of