Abstract
Patrolling recreation areas and extinguishing un-extinguished fires is one of the effective methods of preventing forest fires. Portable knapsack forest fire extinguishers are the most common due to their simplicity and ease of use by technical means of extinguishing forest fires. Their common disadvantages are low efficiency and high consumption of extinguishing agents. The purpose of the study is to increase the efficiency of extinguishing wildfires with the help of knapsack forest fire extinguishers based on the development of constructive and technical solutions and technological techniques that ensure economical use of fire extinguishing agents. The article presents studies of the characteristics of sprayed water and steam-water mixture affecting the extinguishing efficiency. The optimal ratio of the design parameters of the developed knapsack forest fire extinguishers is given. The concentration of water vapor in the air of more than 35% is sufficient to stop the process. Experimentalstudies confirm that sprayed water and steam-water mixtures are effective as independent extinguishing agents, and as a means of creating support strips. When creating support strips, the thickness of the condensate film should be at least 0.1 mm. The effective speed of a patroller with a steam generator should be 1.5‑2.5 km/h.
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