Unsteady rans modeling of water spray suppression for large scale compartment pool fires

Suk Goo Yoon, Paul E. DesJardin, John C. Hewson, Sheldon R. Tieszen, Thomas K. Blanchat, Ho Young Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a computational study of the effect of water spray characteristics on the suppression of a large scale (2 m × 2 m) JP-8 pool fire in a 10 m × 10 m × 10 m compartment with an open ceiling. The numerical model is based on an unsteady Reynolds-averaged Navier Stokes (RANS) formulation using a stochastic separated flow (SSF) approach for the droplets that includes detailed descriptions of the interaction between water droplets and fire plume. Simulation results indicate that water spray injection causes the gas temperature to rise due to the initial enhancement of the turbulent mixing. A threshold suppression condition is achieved when the injected droplet carries enough momentum (injection speed range is 20-80 m/s) to penetrate the fire plume and evaporate in the flame regions where most of the gas-phase combustion is taking place. In addition, the droplet size (ranging from 100-800 μm) should be small enough to yield quick evaporation when in contact with the flame surface for efficient cooling. Based on a parametric study, a preferred fire suppression configuration is recommended for the systems considered.

Original languageEnglish
Title of host publication10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
Publication statusPublished - 2006 Dec 1
Event10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan
Duration: 2006 Aug 272006 Sep 1

Other

Other10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
CountryJapan
CityKyoto
Period06/8/2706/9/1

Fingerprint

Fires
Water
Gases
Ceilings
Numerical models
Momentum
Evaporation
Cooling
Temperature

Keywords

  • Fire suppression
  • Pool fire
  • Spray penetration
  • Turbulent combustion

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Yoon, S. G., DesJardin, P. E., Hewson, J. C., Tieszen, S. R., Blanchat, T. K., & Kim, H. Y. (2006). Unsteady rans modeling of water spray suppression for large scale compartment pool fires. In 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006

Unsteady rans modeling of water spray suppression for large scale compartment pool fires. / Yoon, Suk Goo; DesJardin, Paul E.; Hewson, John C.; Tieszen, Sheldon R.; Blanchat, Thomas K.; Kim, Ho Young.

10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yoon, SG, DesJardin, PE, Hewson, JC, Tieszen, SR, Blanchat, TK & Kim, HY 2006, Unsteady rans modeling of water spray suppression for large scale compartment pool fires. in 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006, Kyoto, Japan, 06/8/27.
Yoon SG, DesJardin PE, Hewson JC, Tieszen SR, Blanchat TK, Kim HY. Unsteady rans modeling of water spray suppression for large scale compartment pool fires. In 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006
Yoon, Suk Goo ; DesJardin, Paul E. ; Hewson, John C. ; Tieszen, Sheldon R. ; Blanchat, Thomas K. ; Kim, Ho Young. / Unsteady rans modeling of water spray suppression for large scale compartment pool fires. 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006.
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N2 - This paper presents a computational study of the effect of water spray characteristics on the suppression of a large scale (2 m × 2 m) JP-8 pool fire in a 10 m × 10 m × 10 m compartment with an open ceiling. The numerical model is based on an unsteady Reynolds-averaged Navier Stokes (RANS) formulation using a stochastic separated flow (SSF) approach for the droplets that includes detailed descriptions of the interaction between water droplets and fire plume. Simulation results indicate that water spray injection causes the gas temperature to rise due to the initial enhancement of the turbulent mixing. A threshold suppression condition is achieved when the injected droplet carries enough momentum (injection speed range is 20-80 m/s) to penetrate the fire plume and evaporate in the flame regions where most of the gas-phase combustion is taking place. In addition, the droplet size (ranging from 100-800 μm) should be small enough to yield quick evaporation when in contact with the flame surface for efficient cooling. Based on a parametric study, a preferred fire suppression configuration is recommended for the systems considered.

AB - This paper presents a computational study of the effect of water spray characteristics on the suppression of a large scale (2 m × 2 m) JP-8 pool fire in a 10 m × 10 m × 10 m compartment with an open ceiling. The numerical model is based on an unsteady Reynolds-averaged Navier Stokes (RANS) formulation using a stochastic separated flow (SSF) approach for the droplets that includes detailed descriptions of the interaction between water droplets and fire plume. Simulation results indicate that water spray injection causes the gas temperature to rise due to the initial enhancement of the turbulent mixing. A threshold suppression condition is achieved when the injected droplet carries enough momentum (injection speed range is 20-80 m/s) to penetrate the fire plume and evaporate in the flame regions where most of the gas-phase combustion is taking place. In addition, the droplet size (ranging from 100-800 μm) should be small enough to yield quick evaporation when in contact with the flame surface for efficient cooling. Based on a parametric study, a preferred fire suppression configuration is recommended for the systems considered.

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