Optimization of powder fire extinguisher design and research parameters of fire extinguishing powder supply

Abstract

Purpose. To optimize the design of the powder fire extinguisher, to investigate the parameters of the supply of fire extinguishing powder, to conduct full-scale tests.

Methods. Experimental determination of fluidity and residue of fire extinguishing powder in the cylinder of the fire extinguisher after its use. Theoretical studies of the value of pressure losses in front of the spray nozzle and the range of the powder jet.

Findings. The dependences of the fluidity of the extinguishing powder and the pressure in front of the spray nozzle on the expiration time of the extinguishing charge were obtained. The average values of the fluidity of the extinguishing powder and the pressure in front of the spray nozzle for the initial and optimized design of the powder extinguisher were established. The design of the fire extinguisher, which allows efficient use of all fire extinguishing powder has been proposed, the pressure losses in the design with a siphon tube have been calculated. According to the pressure and fluidity functions in front of the nozzle, it was found that in the proposed design of the fire extinguisher without increasing the initial working pressure in the cylinder, with increasing the supply of the extinguishing powder, the range of its jet also increases. The values of pressure losses in the siphon tube are calculated. The effectiveness of the proposed design of powder fire extinguisher has been practically proved.

Application field of research. The results of the study can be used to optimize the design of powder fire extinguisher.