Flue gas plume movement simulated experiment apparatus in thermal stratification surroundings

Abstract

The invention relates to an experiment device for simulating the motion of smoke plume under environment of thermal stratification. The device solves the problems that the development of the experimental research on a rising transmission rule of the smoke plume of early fire under environment of thermal stratification lacks an experiment device. The experiment device comprises a closed cavity, a smoke formation mechanism, a data acquisition and processing mechanism and a smoke exhaust mechanism; the closed cavity is a cube; the lower part of a ceiling of the inside of the closed cavity is provided with a square cover of which inner wall is a mirror face; the inside of the square cover is distributed with a plurality of quartz heating tubes; the middle part of the bottom of the square cover is vertically provided with a smoke gas outlet mechanism; the smoke gas outlet mechanism comprises an inlet section, an expansion section, a heating section, a steady flow section, a contraction section and an outlet section; the expansion section is trumpet-shaped; the inside of the heating section is axially provided with a heating resistance wire; the inside of the steady flow section is axially distributed with steady flow tubes; and the contraction section is of an inverse trumpet shape. The experiment device has good controllability, and experiment expandability, can directly place small-power experimental fire in the closed cavity, can also control smoke generation outside the closed cavity by a smoke box and has experiment repeatability.

Description

technical field [0001] The invention relates to a device applied to study the transport law of early fire smoke in high-large space HVAC and sunlight radiation environments, and provides technical support for the scientific and reasonable installation and arrangement method of smoke-sensitive fire detectors in high-large spaces. Background technique [0002] Due to reasons such as HVAC or solar radiation, tall and large space buildings are prone to form a thermal stratification environment where the internal air temperature is high and low. The smoke temperature of the early fire is the same as the surrounding air at a certain height, and the buoyancy of the smoke is zero and gradually turns to zero. Negative value and eventually stop at a certain height. Study the smoke transport law in a thermally stratified environment, determine the maximum height and width of the early fire smoke plume and other parameters in a thermally stratified environment, so as to provide theory a...

AI Technical Summary

Problems solved by technology

At present, most of the domestic and foreign research on large-scale fire smoke is focused on the analysis of the filling law of high-power fire smoke, that is, the study of large-scale large-scale fire smoke transport laws. Most of the research methods use regional simulation and experimental analysis. The experimental research on the law of smoke transport in power fires, especially the law of upward propagation in thermal stratified environments has not been carried out

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