Numerical Study of Spray-Induced Turbulence Using Industrial Fire-Mitigation Nozzles

Guodong Gai, Abdellah Hadjadj, Sergey Kudriakov, Stephane Mimouni and Olivier Thomine
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Guodong Gai: DES-DM2S-STMF, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
Abdellah Hadjadj: Institute for Applied Sciences, INSA Rouen Normandie, Clean Combustion Laboratory, CORIA UMR 6614 CNRS, 76000 Rouen, France
Sergey Kudriakov: DES-DM2S-STMF, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
Stephane Mimouni: EDF R&D, Fluid Dynamics Power Generation and Environment, 78401 Chatou, France
Olivier Thomine: Aix Marseille University, LIS UMR 7020 CNRS, F-13397 Marseille, France

Energies, 2021, vol. 14, issue 4, 1-20

Abstract: A numerical investigation of the spray-induced turbulence generated from industrial spray nozzles is carried out to better understand the roles of the nozzle spray on the fires or explosions in different accidental scenarios. Numerical simulations are first validated against experimental data in the single nozzle case using the monodisperse and polydisperse assumption for droplet diameters. The polydispersion of the nozzle spray is proven to be necessary to correctly predict the gas and droplet velocities. The turbulent kinetic energy has dominant values inside the spray cone, decreases rapidly with the vertical distance from the spray nozzle, and is strongly affected by the spray droplet diameter. On the contrary, the integral length scale is found to have high values outside the spray cone. Two interacting sprays injected from different nozzles are then investigated numerically using the validated polydisperse model. The water sprays generated from such industrial nozzles can generate turbulence of high intensity in the near-nozzle region, and this intensity decreases with the distance from the nozzles. A better understanding of the turbulence generated by the spray system can be beneficial for the evaluation of several important phenomena such as explosion enhancement. The guideline values obtained from this investigation of single and double nozzles can be useful for large-scale numerical simulations.

Keywords: spray nozzle; spray-induced turbulence; polydisperse spray; turbulence intensity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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