Author: Peng, Cheng
Title: Numerical validation of empirical fire plume models and smoke profile
Advisors: Huang, Xinyan (BSE)
Degree: M.Eng.
Year: 2021
Subject: Fire
Fire prevention
Hong Kong Polytechnic University -- Dissertations
Department: Department of Building Services Engineering
Pages: x, 70 pages : color illustrations
Language: English
Abstract: Fire plume models are widely used in the field of fire protection design, but those empirical correlations (e.g., mass flow rate) applied in the model were only derived based on small-scale experiments. Although substantial quantities of numerical simulations were conducted to validate these empirical correlations, they mainly focused on the small-scale test results but rarely verify the extrapolated large-scale values. Herein, numerical simulations via FDS were performed to validate the extrapolated large-scale data about mass flow rate from the classical fire plume model with fire sizes from 300 kW to 1,000 kW and heights from 2.5 m to 12 m. This research revealed that the empirical correlations for mass flow rates were not applicable to large-scale fires. Moreover, turbulent flow at lower level height dragged more ambient air into the plume, thus it might cause the error between the simulation results and empirical correlation curves. We also found that the curves of the simulation result demonstrated that the mass flow rate was proportional to the height of the measuring point, while empirical correlations are power-exponent equations. This research not only discusses the fire behavior of fire plume but also helps to understand the limitations of the fire plume model, as well as pointing the way for further model revision.
Rights: All rights reserved
Access: restricted access

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