A kind of ignition experiment simulation device

Abstract

The invention discloses an ignition experiment simulation device, which comprises a convection heating system, a radiation heating system and solid experimental samples; the convection heating system includes a gas pipeline, an air compressor, a convection heater and a convection heating control cabinet; the outlet of the gas pipeline is provided with Platinum sheet, platinum mesh and water-cooled casing; the radiation heating system includes an infrared heating module and an infrared heating control cabinet. The above-mentioned device includes a convection heating system, a radiation heating system, a convection heating control cabinet and an infrared heating control cabinet, which can relatively independently adjust the convection heating heat flux value and radiation heat flux value applied by the convection heating system and the radiation heating system to solid experimental samples , in order to achieve precise control of radiant heat flux and convective heating heat flow; and set platinum sheet, platinum mesh and water-cooling sleeve at the outlet of the gas pipeline, so that the outlet end becomes a low-radiation pipeline, so that the device can be more flexibly adjusted The relative proportion of radiative heat flux to convective heating heat flux in the total heat flux provided.

Description

technical field [0001] The invention relates to the technical field of material ignition, and more specifically relates to an ignition experiment simulation device. Background technique [0002] Forest fire is one of the eight natural disasters in the world. The historical cases of major fires show that the situation of forest-urban junction area fires (hereinafter referred to as junction area fires) in countries around the world, including my country, is becoming increasingly severe. The mixed distribution of buildings and vegetation in the boundary area, the distribution of combustibles and the geographical environment are very complex, and fires are more likely to cause serious consequences. Fire spread is the process in which the flame continuously preheats the fuel in front and continues to ignite. Pyrolysis and ignition of combustibles are the initial stages of solid fires, and are crucial to the spread and development of fires in boundary areas. In the real fire spr...

AI Technical Summary

Problems solved by technology

Due to the uncertainty of the dominant heating mechanism, previous researchers conducted ignition experiments under the conditions of radiative heating or convective heating, but existing devices cannot simultaneously achieve independent control of radiative heat flux and convective heating heat flow; and the existing The convection heating device used conventional high-emissivity materials in the convection section, and did not take measures to reduce the background radiation value of the convection device, which had a non-negligible impact on the correlation between ignition characteristic parameters and convective heating changes

Moreover, the size of the outlet end of the existing convection device and the flow rate of the air flow are small, which brings great restrictions on the choice of experimental sample size and experimental conditions

That is to say, the existing devices cannot realize the fine control of the radiant heat flux and the convective heating heat flow at the same time, nor can they relatively independently adjust the proportion of the convective heating heat flux and the radiant heat flux in the total heating heat flow; and the current convective heating device There are high background radiation values ​​and low upper airflow velocity limits, which cannot cover the range of parameters in real forest fire scenarios

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