A device for automatically stabilizing the spatial position of the front of a solid material countercurrent flame spread

Abstract

The invention discloses a device for automatically stabilizing the space position of a counterflow flame propagation front of a solid material. A solid material to be measured is installed on a counterflow flame propagation experimental bench which can be automatically controlled by a motor to move along a slide rail; a video camera is used to capture the relative position relationships and relative movement speeds of a flame front of the solid material to be measured and a certain fixed reference baseline nearby in real time; a microcomputer control system is used to obtain these parameters in real time so as to regulate the motor for controlling the position of the counterflow flame propagation experimental bench, so that the position of the flame front relative to the solid reference baseline is always constant; and in this way, the space stabilization of the position of the flame front is realized by moving the relative position of the whole solid material. Stabilization of the space position of the counterflow flame facilitates fixed installation and measurement of measuring sensors and the device, so that gas temperature fields, composition fields and flame dynamic structures nearby the flame front can be carefully observed.

Description

technical field [0001] The invention relates to the field of solid material flame spread, and more specifically relates to an automatic stagnation device for the spatial position of the front of solid material countercurrent flame spread. Background technique [0002] The heat transfer and mass transfer processes near the flame front during the fire spread of solid materials are the main factors affecting its fire spread characteristics. Therefore, the measurement of the temperature field and component field at the position of the flame front and its adjacent areas plays an important role in understanding the mechanism of flame spread. However, under normal conditions, the basic characteristic of solid flame spread is that the spatial position of its flame front moves forward with time, which makes it difficult for us to accurately capture the heat and mass transfer characteristics near the flame front. Existing experimental methods and devices for the study of flame spread...

AI Technical Summary

Problems solved by technology

However, under normal conditions, the basic characteristic of solid flame spread is that the spatial position of its flame front moves forward with time, which makes it difficult for us to accurately capture the heat and mass transfer characteristics near the flame front

Existing experimental methods and devices for the study of flame spread mechanism (such as: "Experimental Measurement of Fire Spread Rate on Vertical Wall" in the article "Fire Science" No. 2, 2001, pp. 88-91, invention patent 201320244793.2, invention patent 201510870178.6) , they all use video cameras to directly record the entire dynamic fire spread video from the front and side. At the same time, because the dynamic arrangement of the instruments for measuring fire spread is difficult to realize, it can only be replaced by static arrangement, which makes it impossible to accurately and effectively monitor the flame in the experiment. The separation and positioning of the pyrolysis front and the pyrolysis front also hinder the subsequent real-time measurement of the gas temperature field and component field in its neighborhood, and the accurate measurement of the temperature field and component field is essential for the analysis and establishment of material fire. In the spreading model, "the heat transfer and chemical reaction kinetic mechanism of the high temperature flame to the material in the pyrolysis zone and the preheating zone" is of great significance

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