DETERMINATION OF COMBUSTION PARAMETERS OF CLASS A FIRE MODELS FOR THEIR FURTHER APPLICATION DURING WHEELED VEHICLE FIRE SIMULATION

Abstract

The expediency of conducting experimental studies to determine the combustion parameters of model fires of classes A and B for their further use during fire modeling of wheeled vehicles is indicated. It is indicated that the Institute of public administration and research in civil protection conducts scientific research work on the topic «Justification of parameters and types of primary fire extinguishing means for equipping wheeled vehicles», within the framework of which the first block of experimental research on detecting the dependence of loss has been carried out to date masses from the burning time of model fires of Class A fires of different ranks and the dynamics of their temperature changes over time. It is emphasized that the main parameters characterizing the burning process of model fires are the loss of the mass of the model fire and the change in temperature and heat flow density. At the same time, the moisture content of the wood and the distance between adjacent bars in the layer of the model hearth play a significant role. The characteristics of model fires of classes 5А, 8А and 13А are given. The methodology of conducting is described and the results of experimental studies are given to determine the mass loss of model fires of classes 5А, 8А and 13А according to DSTU EN 3-7:2014, depending on their burning time. The dynamics of temperature changes over time were determined for three different control points of each of the specified model fire foci. Attention is drawn to the fact that three thermocouples were used to register the temperature in each model fire of classes 5А, 8А and 13А, which were located in specified places, namely: thermocouple 1 – inside the model fire, thermocouple 2 – at a height of 10 cm above the model fire fire,
thermocouple 3 – at a height of 100 cm above the model fire. The dependence of the mass burning rate of model fires of classes 5A, 8A and 13A on the duration of their burning was determined. This publication plots all the above dependencies. It is noted that in the future it is necessary to continue experimental research on the determination of combustion parameters of model fires of class B. Appropriate conclusions have been drawn.