Study on the Water Mist Flow Flux Distribution and Fire Extinguishing Effect Based on Improved Nozzle Structure

In this paper, the improved nozzle structure, which is a combination of 4 concave runners, 1.5 mm runner depth, 30 ° runner inclination angle and 0.6 mm nozzle aperture, is used to investigate the water mist flow flux distribution under different pressures and the influence of the fire source position offset on the oil pan fire extinguishing effect. The results show that: the mist flux in the mist field gradually decreases from the inside to the outside, and the change of working pressure has a little influence on mist flux, but the working pressure will change the distribution of mist flux. The fire extinguishing effect is still well within the fire source position offset of 25cm, and when the fire source position offset reaches to 50cm and 100 cm, it can control the main flame to a certain range but is unable to effectively extinguish the fire.