The main purpose of this work is analysis of perimeter and radial distribution of droplets in the spray generated by two mist nozzles: stream-whirl and whirl designed in The Main School of Fire Service, and the typical sprinkler.The extinguishing effectiveness of the nozzle is mainly dependent on three parameters: spraying angle, average volumetric diameter of droplets and sprinkling intensity. Either radial functions or perimeter functions of average volume diameter of droplets and sprinkling intensity were obtained on the basis of the measurements of droplets spectrum in selected points positioned symmetrically on the horizontal plane. Using criteria defined by the authors obtained characteristics were compared from extinguishing effectiveness point of view, and the conclusions concerning applicability of the nozzles and sprinkler in fire protection area were formulated.
COMPARATIVE ANALYSIS OF SPRAY PARAMETERS GENERATED BY MIST NOZZLES AND A SPRINKLER FROM THE POINT OF VIEW OF THEIR EXTINGUISHING EFFECTIVENESS
The aim of the work is a comparative analysis of the radial-perimeter distribution of droplets in the spray generated by two mist nozzles designed at the Main School of Fire Service: stream-whirl and whirl, as well as a typical sprinkler, in terms of their extinguishing effectiveness. It depends primarily on three parameters: spray angle, average volumetric droplet diameter, and sprinkling intensity. Based on measurements of the droplet spray spectrum at several dozen evenly distributed points on a plane, both radial and perimeter distributions of the average volumetric droplet diameter and sprinkling intensity were obtained. Using the adopted criteria, the properties influencing their extinguishing effectiveness were compared, and on this basis, conclusions were formulated regarding the suitability of the designed mist nozzles and the sprinkler in fixed fire extinguishing systems.
The Main School of Fire Service, Faculty of Fire Safety, POLAND, Warsaw 01-692, Slowackiego 52/54. (…)
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Source: Logistyka Magazine