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Fire smoke flow field tracer method

A smoke flow and fire technology, applied in fluid dynamics tests, measuring devices, instruments, etc., can solve the problems of difficulty in distinguishing single smoke particles, small particle size of smoke particles, poor photosensitivity, etc., to avoid randomness, The effect of full and complete combustion and controllable ignition power

Inactive Publication Date: 2010-02-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the smoke particles produced by fire combustion are dispersed in the smoke layer in the form of aerosols. The particle size of this type of smoke particles is too small and the photosensitivity is not good. particle resolution

Method used

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  • Fire smoke flow field tracer method
  • Fire smoke flow field tracer method

Examples

Experimental program
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Embodiment 1

[0018] Example 1: Measurement of Fire Smoke Layer Thickness and Shape

[0019] see figure 1 , in this embodiment, the lit sandalwood 3 and its supporting device 4 are placed near the propane gas burner 1; the fire plume above the propane gas burner 1 entrains and entrains the smoke particles produced by the sandalwood 3 to In the smoke layer, the smoke layer is covered with sandalwood smoke particles; the laser light source 5 is used to form a light plane in the vertical direction, and the laser light is reflected after the sandalwood smoke particles, so that the shape of the smoke layer and the smoke layer The thickness is visible; the shape and thickness of the smoke layer is recorded by a camera with an angle of more than 90 degrees between the shooting direction and the laser irradiation direction.

Embodiment 2

[0020] Example 2: Measurement of Fire Smoke Flow Field Structure

[0021] see figure 2 , in this embodiment, the boron nitride particles of 1-5 μm are deposited in the tracer particle storage device 7, the air compressor 4 is turned on, and the outlet air velocity of the air compressor is adjusted, and the outlet of the air compressor passes through the air intake pipe 8 is connected with the tracer particle storage device 7; after the boron nitride particles are repeatedly collided in the particle storage device 7, they are ejected in the direction of the fire plume through the tracer particle nozzle 11; the boron nitride particles are entrained by the fire plume In the smoke layer, and move with the smoke layer; the laser sheet light source 5 is used to form a sheet light plane, and the laser is irradiated on the boron nitride particles and then reflected, making the boron nitride place form a bright spot; the shooting direction and the laser sheet light plane are 90 A cam...

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Abstract

The invention provides a fire smoke flow field tracer method which comprises a fire source analog system, a laser sheet optical system, an image pickup system, a smoke particle analog method and a tracer grain adding method; wherein the fire source analog system adopts a propane gas burner with controllable gas flow rate; smoke particles generated by burning sandalwood are adopted to simulate firesmoke particles; the grain diameter of the tracer grain is 1-5mu m of boron nitride grain; the boron nitride grains are evenly and stably transmitted into a flue gas layer by an air compressor; the method can be widely applied to small-scale and full-scale tests of fire, so as to lead the process of fire test to be safe, controllable and environment-friendly; by adopting the method, the key parameters such as the thickness, the form, the flow field structure and the like of the fire flue gas layer can be obtained, thus having important significance for guiding fire smoke control.

Description

technical field [0001] The invention relates to a tracing method of smoke form and flow field in fire experiments. Background technique [0002] Fire smoke is an important factor causing fire spread, casualties and property losses. The thickness of the smoke layer and the flow field structure inside the smoke layer are the key parameters in the fire experiment. However, the accurate acquisition of such parameters has always been a difficulty in fire experiments. The reasons are as follows: On the one hand, the smoke generated by fire combustion causes a sharp drop in visibility in the experimental space, making it difficult for the naked eye and camera equipment to directly observe and record the thickness of the smoke layer. . Some scholars have proposed to use the method based on the vertical distribution of temperature to indirectly judge the thickness of the smoke layer, but there is a big difference between the temperature and the vertical distribution of smoke partic...

Claims

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Application Information

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IPC IPC(8): G01M10/00G01B11/06G01B11/24G01N21/84
Inventor 霍然阳东祝实唐飞胡隆华胡银方
Owner UNIV OF SCI & TECH OF CHINA
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