CFD Modelling of Water Mist Fire Suppression

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Authors
  1. Alexander, D.
  2. Li, E.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
This report examines the capabilities of computational fluid dynamics (CFD) models for predicting water mist fire suppression (WMFS) system performance. The Fire Dynamics Simulator version 5.3.4 CFD package was selected for water mist fire suppression modeling and the applicability of this model and its limitations when modeling the results of real fires are outlined. Twelve experimentally investigated naval machinery space fire tests were simulated to validate the model. Reasonable agreement was achieved, but the effort was hampered by a lack of data about the test configurations. Data requirements for future experimental work used to validate CFD models are outlined. The machinery space test scenario detailed in the International Marine Organization MSC 1165 standard was chosen for a systematic study of WMFS system parameters. The effect of varying fire size and location, preburn time, the presence of obstructions, mist flow rate, droplet size and velocity distributions, vent size and locations, nozzle placement, and compartment scale were investigated. The trends in WMFS system effectiveness can be determined via CFD analysis, but there are currently significant limitations to the application of CFD models. The extinction criterion in the Fire Dynamics Simulator requires modifications to generate more accurate solutions and further validation of CFD results with experimental findings are required.

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Report Number
DRDC-ATLANTIC-CR-2010-112 — Contractor Report
Date of publication
01 Jul 2010
Number of Pages
212
DSTKIM No
CA034753
CANDIS No
534269
Format(s):
Electronic Document(PDF)

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