In most cases, a 2s timeframe is sufficient for hot aerosol extinguishing agents to burn out. Additives with a high nitrogen composition can enhance the burning speed and increase the production of nitrogen. A standard deviation correction algorithm, based on the high-speed infrared imager, was proposed to test the flame temperature curve, avoiding the difficulties of thermocouple acquisition and low sampling frequency. This was combined with the Grubbs criterion to judge the combustion stability of transiently burning hot aerosol fire extinguishing agents. The stable combustion temperature and residual rate were also considered to analyze the combustion performance. The results demonstrate that the standard deviation algorithm, based on the temperature profile, is capable of rapidly identifying the most effective additives and optimal ratio, facilitating the selection of extinguishing times and stable combustion temperatures.
With the rapid development of optoelectronic weapons, smoke screen as an important means of optoelectronic confrontation is receiving more and more attention. The test and evaluation of the effect of anti-infrared smoke screen interference is the basis for the development of anti-infrared smoke. Aiming at the problem of incomplete evaluation of the infrared interference effect of smoke in the indoor smoke box experiment, this paper introduced the parameters commonly used to evaluate the attenuation and suspension performances of smoke: Transmittance (๐), Total Obscuring Power (๐๐๐), Mass Extinction Coefficient (๐ผ๐), Mass-based Composition Figure of Merit (๐น๐๐), suspension time, deposition velocity, movement velocity with wind. The movement of smoke particles in the smoke box experiment including sedimentation, diffusion and coagulation was analyzed. The principle and method of using infrared thermal imager to test the interference performance of anti-infrared smoke in smoke box experiment were introduced. Based on the Lambert-Beer law which finds that the change process of โln๐ with time is approximately a straight line, so the intercept and slope of the fitted straight line of โln๐ varies with time are proposed as parameters to evaluate the attenuation performance and suspension performance of the smoke screen. The attenuation performance and suspension performance of nine kinds of smoke screens were evaluated using this evaluation method, and the results showed that this method can be used to quantitatively evaluate the attenuation performance and suspension performance of smoke screen in smoke box experiments.
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