Experimental study of the fluctuations of gas medium parameters as early signs of fire
The results of the experimental study of fluctuations of dynamics of hazardous factors of gaseous medium at early ignition of combustible materials in the chamber, simulating pressurized premises, are presented. The authors considered a non-traditional approach to research into dynamics of hazardous...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
PC Technology Center
2018-02-01
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| Series: | Eastern-European Journal of Enterprise Technologies |
| Subjects: | |
| Online Access: | http://journals.uran.ua/eejet/article/view/122419 |
| Summary: | The results of the experimental study of fluctuations of dynamics of hazardous factors of gaseous medium at early ignition of combustible materials in the chamber, simulating pressurized premises, are presented. The authors considered a non-traditional approach to research into dynamics of hazardous factors, based on current window estimation of the Pearson lag correlations for fluctuations of the main parameters of gaseous medium as non-stationary processes. In contrast to the known approaches, a given approach makes it possible to perform reliable localization in time of an early ignition of materials in premises.
It was established that early ignition of materials has a significant effect on correlations of temperature fluctuations, concentrations of carbon monoxide and smoke in gaseous medium. It was shown that correlations of fluctuations of carbon monoxide and smoke concentrations are most informative for localization of early ignitions. Temperature fluctuations are more informative at localization of early ignition of alcohol and paper. The results of current window evaluation of the Pearson lag correlations show that in the absence of ignitions, fluctuations can be considered uncorrelated. In this case, existence of ignition leads to occurrence of non-stationary fluctuations of correlations.
It is indicated that fluctuations of parameters of gaseous medium in the general case are described by autoregression processes of higher order, depending both on the type of combustible material and the stage of ignition development. A sustainable sign of early ignition of combustible materials in the simulation chamber is a significant increase in the correlation interval of non-stationary temperature fluctuations, as well as concentrations of carbon monoxide and smoke in gaseous medium. In equilibrium of gas medium, fluctuations of its parameters have a much smaller correlation interval, characteristic for uncorrelated processes |
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| ISSN: | 1729-3774 1729-4061 |