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ISSN 打印: 1044-5110

ISSN 在线: 1936-2684

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Indexed in

ATOMIZATION AND DISPERSION MEASUREMENTS IN FIRE SPRINKLER SPRAYS

卷 19, 册 12, 2009, pp. 1125-1136
DOI: 10.1615/AtomizSpr.v19.i12.30
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摘要

Water sprays are commonly used in fire suppression applications for cooling the fire environment. This cooling is achieved through the evaporation of droplets (dispersed in the fire gases) and through the wetting of surfaces (from hot or burning materials), inhibiting both the growth and spread of the fire. The suppression performance of these sprays is determined by their ability to penetrate the fire (i.e., the induced flow) to reach burning surfaces below, while dispersing water throughout the hot environment. Spray penetration and dispersion are governed by the initial drop size and velocity characteristics of the spray, which depend on the injection conditions and nozzle configuration. In many fire suppression devices, such as sprinklers, a jet is injected onto a deflector to generate the water spray. Although there are many variations on this basic concept, most sprinklers include a central boss surrounded by a deflector having both tines and spaces. To study the essential physics of the atomization process, discharge characteristics from simplified nozzles were measured. These measurements were compared with those from a more realistic sprinkler configuration. Flow visualization experiments revealed that the canonical impinging jet configuration produces a radially expanding sheet. While similar atomization mechanisms were observed, the realistic sprinkler configuration produces a three-dimensional sheet with two distinct flow streams generated by the tines and spaces of the nozzle. Comprehensive experiments were conducted to describe atomization (e.g., sheet breakup locations and initial drop sizes) and dispersion (e.g., volume density and local drop size profiles) in these sprays.

对本文的引用
  1. Santangelo Paolo E., Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers, Journal of Thermal Science, 21, 6, 2012. Crossref

  2. Santangelo Paolo E., Characterization of high-pressure water-mist sprays: Experimental analysis of droplet size and dispersion, Experimental Thermal and Fluid Science, 34, 8, 2010. Crossref

  3. Aghajani Hamed, Dembele Siaka, Wen Jennifer X., Analysis of a semi-empirical sprinkler spray model, Fire Safety Journal, 64, 2014. Crossref

  4. Santangelo Paolo E., Tarozzi Luca, Tartarini Paolo, Full-Scale Experiments of Fire Control and Suppression in Enclosed Car Parks: A Comparison Between Sprinkler and Water-Mist Systems, Fire Technology, 52, 5, 2016. Crossref

  5. Jiang Yue, Li Hong, Xiang Qingjiang, Chen Chao, Comparison of PIV Experiment and Numerical Simulation on the Velocity Distribution of Intermediate Pressure Jets with Different Nozzle Parameters, Irrigation and Drainage, 66, 4, 2017. Crossref

  6. Andrei Kamluk, Alexey Likhomanov, Increasing foam expansion rate by means of changing the sprinkler geometry, Fire Safety Journal, 109, 2019. Crossref

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