Modeling and simulation of supersonic nozzle gas jet laden with polydisperse fire suppressant particles injected from a bypass injector

Zhang, Lite; Sun, Mengyu; Guan, Hao; Wu, Sheng; Jia, Huixia; Jin, Haozhe

doi:10.1016/j.ces.2023.118983

Cited by 4 publications

(6 citation statements)

References 33 publications

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“…Therefore, in our previous work [2], we integrated the drag coefficient models proposed by Parmar, Henderson, and Clift et al [20,26,27], respectively, and proposed a new modified drag coefficient model under the premise of comprehensive consideration of gas compressibility, inertia, and rarefaction effects. It is worth noting that since neither the Clift nor the Parmar models consider the gas rarefaction effects, we have made an additional correction for this aspect of rarefaction effects in our existing model.…”

Section: Discrete Phase Physical Modeling 231 Resistance Coefficient ...mentioning

confidence: 99%

“…By using a bypass nozzle and an injection-type dry powder fire extinguisher, the fire extinguishing agent particles are fully accelerated and dispersed in a gas jet. The supersonic dry powder jet obtained from the nozzle outlet will significantly improve its fire extinguishing efficiency for large-scale fires [2].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this paper carries out the design of key geometric parameters, such as the length ratio of the main nozzle and the area ratio of the outlet throat based on the induced supersonic nozzle dry powder extinguishing agent gas jet. Based on the gas-phase SST k-ω turbulence model, particle discrete stochastic orbital model, finite volume method, structured combined boundary layer mesh, time-stepping method, and the modified drag model constructed by Zhang et al [2] were used to analyze the effects of the nozzle instream and out-of-tube jet parameters. To fully understand the gas-solid two-phase flow behavior inside and outside the powder extinguishing agent transport channel, this paper analyzes the polydisperse two-phase flow field and the influence of main nozzle geometric parameters (length ratio r L , area ratio r A ) on the jet performance indicators, such as the particle average velocity v p,a , velocity nonuniformity Φ vp , particle dispersion Ψ p , and particle average acceleration a p,a .…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

Zhang,

Feng,

et al. 2024

Fire

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A two-way coupled model between polydisperse particle phases with compressible gases and a density-based coupling implicit solution method, combining the third-order MUSCL with QUICK spatial discretization scheme and the second-order temporal discretization scheme, are constructed based on the discrete-phase model (DPM) and the stochastic wander model (DRWM) in the Eulerian–Lagrangian framework in conjunction with a unitary particulate source (PSIC) approach and the SST k-ω turbulence model. The accuracy of the numerical prediction method is verified using previous supersonic nozzle gas-solid two-phase flow experiments. Numerical simulation of a two-phase jet of dry powder extinguishing agent gas with pilot-type supersonic nozzle was performed to analyze the influence of geometrical parameters, such as the length ratio rL and the area ratio rA of the main nozzle on the two-phase flow field, as well as on the jet performance indexes, such as the particle mean velocity vp,a, velocity inhomogeneity Φvp, particle dispersion Ψp, particle mean acceleration ap,a, etc. By analyzing the parameters, we indicate the requirements for the combination of jet performance metrics for different flame types such as penetrating, spreading, and dispersing.

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Section: Discrete Phase Physical Modeling 231 Resistance Coefficient ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

Zhang,

Feng,

et al. 2024

Fire

Self Cite

View full text Add to dashboard Cite

show abstract

“…By using a bypass nozzle and an injection type dry powder fire extinguisher, the fire extinguishing agent particles are fully accelerated and necessary dispersed in the gas jet. The supersonic dry powder jet obtained from the nozzle outlet will significantly improve the fire extinguishing efficiency for large-scale fires [1].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this paper carries out the design of key geometric parameters such as the length ratio of the main nozzle and the area ratio of the outlet throat based on the induced supersonic nozzle dry powder extinguishing agent gas jet. Based on the gas-phase SST k-ω turbulence model, particle discrete stochastic orbital model, finite volume method, structured combined boundary layer mesh, time-stepping method, and the modified drag model constructed by Zhang et al [1]. were used to analyze the effects of nozzle in-stream and out-of-tube jet parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

Zhang,

Feng,

et al. 2024

Preprint

View full text Add to dashboard Cite

A two-way coupled model between polydisperse particle phases with compressible gases and a density-based coupling implicit solution method combining the third-order MUSCL with QUICK spatial discretization scheme and the second-order temporal discretization scheme are constructed based on the discrete-phase model (DPM) and the stochastic wander model (DRWM) in the Eu-lerian-Lagrangian framework in conjunction with a unitary particulate source (PSIC) approach and the SST k-ω turbulence model. The accuracy of the numerical prediction method is verified using previous supersonic nozzle gas-solid two-phase flow experiments. Numerical simulation of two-phase jet of dry powder extinguishing agent gas with pilot-type supersonic nozzle was carried out to analyze the influence of geometrical parameters such as length ratio rL and area ratio rA of main nozzle on the two-phase flow field as well as on the jet performance indexes such as particle mean velocity vp,a, velocity inhomogeneity Φvp, particle dispersion Ψp, particle mean acceleration ap,a and so on. By analyzing the parameters, we indicate the requirements for the combination of jet performance metrics for different flame types such as penetrating, spreading, and dispersing.

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A general drag coefficient model for a spherical particle incorporating rarefaction and particle-to-gas temperature ratio effects

Zhang,

Feng,

Guan

et al. 2024

Chemical Engineering Science

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Modeling and simulation of supersonic nozzle gas jet laden with polydisperse fire suppressant particles injected from a bypass injector

Cited by 4 publications

References 33 publications

Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

Numerical Study of the Effect of Primary Nozzle Geometry on Supersonic Gas-Solid Jet of Bypass Injected Dry Powder Fire Extinguishing Device

A general drag coefficient model for a spherical particle incorporating rarefaction and particle-to-gas temperature ratio effects

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