Features of the process of water filling the barrel of a periodic-pulse fire extinguishing installation

Abstract

In the work, research was carried out, which made it possible to reveal the peculiarities of the process of filling the barrel of the periodic-impulse fire extinguishing installation with water. At the same time, a mathematical model for simulating the processes of water injection into a pipe with subsequent crushing of water by a shock wave was substantiated and proposed. To simulate the processes of water injection and water crushing in the shaft of the installation, a VOF model (volume of liquid model) is used, according to which there is no penetration of one medium into another, and which is based on the surface tracking method applied to a fixed Euler grid. On the basis of the developed mathematical model in the ANSYS software environment, numerical studies of the process of filling the barrel of a periodic-impulse fire extinguishing installation with water were carried out. According to the results of a numerical study of the process of filling the barrel of the periodic-impulse fire extinguishing installation with water, a relatively high inertia in the time of the water injection processes in relation to the gas detonation processes occurring in the periodic-impulse fire extinguishing installation was revealed. In particular, the time interval between detonation cycles in the installation operating at a frequency of 23 Hz is about 43,5 ms. If we discard the purge cycle, then we have a time interval of 21 ms, during which it is necessary to inject water into the barrel of the intermittent-impulse fire extinguishing installation. According to the results of the above studies, we have that only the time for the spread of the stream of water from one side to the other side of the barrel of the periodic-impulse fire extinguishing installation is 8 ms. The conducted research makes it possible to investigate the influence of the parameters of the fire extinguishing installation on the formation of a finely sprayed water jet, and the obtained results will significantly increase the level of operational readiness of the personnel of fire and rescue units during operational actions to extinguish internal fires.