Kovalyshyn V. Development of the scientific foundations for fire-fighting in closed spaces having great length

The dissertation work is dedicated to the solution of an actual scientific and applied problem that lies in the development of the scientific foundations for fire-fighting in closed spaces having great length by way of their temporary isolation at the two sides. This leads to fire control with the further fire extinguishing with the use of burning products depleted by oxygen by means of their repeated recirculation, their use for the production of gas and mechanical foam based upon them to be delivered to the burning zone with the subsidiary application as necessary of steam and gas mixture, dispersed water, dry chemicals, or inhibiting fire extinguishing substances that leads to fast cessation of burning as well as cooling zone around the fireplace. A generalized approach to the estimation of influence of a number of fire extinguishing means in great length objects taking into consideration reduction of burning area (in the case of dry chemicals), simultaneous cooling of fire gases with the evaporation of the liquid droplets (in the case of dispersed water or foam), and due to lowering oxygen content in the burning zone (recirculation, steam and gas mixtures, and an inert gas) has been applied for the first time. A number of analytical relations have been obtained of oxygen concentration and temperature versus length of the channel in the air flow under quasi-stationary regime for any fixed instant from the moment of fire origination. A method for the determination of optimum parameters of fire fighting with various means as well as an algorithm and a program for the calculation of fire fighting parameters have been developed in the work. Choice and substantiation of the technical means for fire fighting in closed spaces at great length objects have been done and appropriate normative and lawful base for their application has been developed.