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- Publisher
- Springer Journals
- Copyright
- 2015 Pleiades Publishing, Ltd.
- ISSN
- 0869-8643
- eISSN
- 1531-8699
- DOI
- 10.1134/S0869864315050091
- Publisher site
- See Article on Publisher Site
Abstract
Abstract The model and the computer code FDS, albeit widely used in engineering practice to predict fire development, is not sufficiently validated for fire suppression by fine water sprays. In this work, the effect of numerical resolution of the large scale turbulent pulsations on the accuracy of predicted time-averaged spray parameters is evaluated. Comparison of the simulation results obtained with the two versions of the model and code, as well as that of the predicted and measured radial distributions of the liquid flow rate revealed the need to apply monotonic and yet sufficiently accurate discrete approximations of the convective terms. Failure to do so delays jet break-up, otherwise induced by large turbulent eddies, thereby excessively focuses the predicted flow around its axis. The effect of the pressure drop in the spray nozzle is also examined, and its increase has shown to cause only weak increase of the evaporated fraction and vapor concentration despite the significant increase of flow velocity.
Journal
Thermophysics and Aeromechanics – Springer Journals
Published: Sep 1, 2015