Research on the Regular between Concentration of Superfine Powder Extinguishing Agent Explosion Scatter and Fire-Extinguishing Ability

Li, Yang; Zhao, Qian; Chai, Xiao; Ying, Xiao

doi:10.4028/www.scientific.net/amr.887-888.1017

Cited by 2 publications

(2 citation statements)

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“…The common storage structures for UPEA are spherical and cylindrical, with the cylindrical structure having a wider application than the spherical one and being more conducive to injection experiments. 44,45 A 3D model of the cylindrical structure of the fire extinguishing bottle was established. The hemispherical spatial calculation domain of the nozzle was established with the nozzle of the fire extinguishing bottle nozzle as the center.…”

Section: D Modelmentioning

confidence: 99%

Numerical simulation of ultra-fine powder extinguishing agent injection process

Zhou

Shi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The process of pressurized injection of ultra-fine powder extinguishing agents (UPEA) and the effect of injection from the nozzle directly affects the spatial dispersion characteristics and the effectiveness of fire extinguishing. Combining CFD simulations and experimental measurements, the UPEA pressurized injection process and injection effects were investigated. The transient process of injection is divided into three stages, initial injection stage, steady injection stage, and post-injection stage. The post-injection stage is divided into a slow decay process and a residual gas release process. Investigating the effect of different filling conditions on the effectiveness of particle injection. In the stable injection stage, the higher the filling ratio, the lower the mass flow of UPEA particles at the same filling pressure. At the same filling ratio, the higher the filling pressure, the higher the mass flow of UPEA particles. The maximum mass flow of the UPEA particles was 5.38 kg/s at a filling ratio of 20% and a filling pressure of 3.6 MPa. The steady injection time is mainly influenced by the particle filling ratio.

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Section: D Modelmentioning

confidence: 99%

Numerical simulation of ultra-fine powder extinguishing agent injection process

Zhou

Shi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Explosive dispersal of the granular materials is extensively applied in industrial security and military engineering [ 1 , 2 , 3 , 4 , 5 ]. Dry powder fire-extinguishing bombs explode and disperse the dry powder particles to form stable aerosols, serving for fire control and suppression [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Dispersal Characteristics Dependence on Mass Ratio for Explosively Driven Dry Powder Particle

et al. 2023

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An investigation on the dispersal characteristics of the cylindrically packed material of dry powder particles driven by explosive load is presented. By establishing a controllable experimental system under laboratory conditions and combining with near-field simulation, the particle dispersal process is described. Additionally, Kelvin–Helmholtz instability is observed during the process of jet deceleration dispersal. The characteristic parameters of radially propagated particles are explored under different mass ratio of particle-to-charge (M/C). Results indicate that, when the charge mass remains constant, an increase in M/C leads to a decrease in dispersed jet number, void radius and maximum velocity, wherein the maximum velocity correlates with calculations by the porous Gurney model. The case of the smaller M/C always has a higher outer-boundary radius and area expansion factor. Findings indicate that when particles detach from the jet upon reaching minimum acceleration and entering low-speed far-field stage from high-speed near-field stage, the outer-boundary radius is 30~36 times the initial particles’ body radius under different M/C. In addition, particle concentration distribution over time and distance is qualitatively analyzed by the grayscale image method. This research can be referential for improving the fire-extinguishing capacity of extinguishing bombs and the damage property of fuel air explosive (FAE).

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Research on the Regular between Concentration of Superfine Powder Extinguishing Agent Explosion Scatter and Fire-Extinguishing Ability

Cited by 2 publications

References 0 publications

Numerical simulation of ultra-fine powder extinguishing agent injection process

Numerical simulation of ultra-fine powder extinguishing agent injection process

Dispersal Characteristics Dependence on Mass Ratio for Explosively Driven Dry Powder Particle

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