Near-Field Radiant Heat Flux from Open-Air Gasoline and Diesel Pool Fires: Modified Point Source and Discretized Solid Flame Models
Autor: | Spencer E. Quiel, Zheda Zhu |
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Rok vydání: | 2021 |
Předmět: |
040101 forestry
Point source Radiant energy 020101 civil engineering Near and far field 04 agricultural and veterinary sciences 02 engineering and technology Mechanics Gauge (firearms) 0201 civil engineering Diesel fuel Radiative transfer 0401 agriculture forestry and fisheries Environmental science General Materials Science Point (geometry) Safety Risk Reliability and Quality Radiant intensity |
Zdroj: | Fire Technology. 57:1901-1926 |
ISSN: | 1572-8099 0015-2684 |
Popis: | This paper proposes novel modifications to existing solid flame and point source models to better predict the spatial contour of near-field, steady-state radiant heat flux from large circular pool fires (with diameters ranging from 1 m to 20 m) with gasoline and diesel fuel. The proposed models account for partial smoke obscuration of the flames, and the emissive power of the visible flame layer is calculated via a radiative fraction of the fire’s heat release rate as a function of the pool size. The modified discretized solid flame model uses a cylinder + cone shape combination whose surfaces are discretized to enable a flexible summation of total radiative energy emission. The modified point source model places its radiating point at the mid-height of the visible flame layer to capture the location of maximum radiation intensity. Predictions from both proposed models are benchmarked against available data from pool fire experiments, calibrated against computational fluid dynamic simulations, and compared with existing analytical solutions for a range of pool fire diameters at varying standoffs and gauge heights. The results demonstrate that the proposed models can effectively predict the spatial contour and peak value of radiant heat flux on nearby targets (i.e., at distances less than 2.5 times the pool diameter) with low computational effort. |
Databáze: | OpenAIRE |
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