Study of Entrainment and Flow Patterns in Pool Fires Using Particle ImagingVelocimetry

摘要

An experimental and theoretical study of the flow fields induced by pool fireswas completed. Pool burners of three diameters, namely 7.1 cm, 15 cm and 30 cm, were used. For the two smaller pool burners, the effects of a 51 cm sheet metal floor around the pool at the surface were also studied. Three fuel, methanol, toluene and heptane were burned as representatives of alcohols, paraffins and aromatics. The velocity field induced by the 7.1 cm toluene pool fire with the metal floor was mapped with a Laser Doppler Velocimetry (LDV) system. The transient characteristics of the velocities were studied by analyzing their discrete Probability Desity Functions (PDFs) and their Power Spectral Densities (PSDs). The instantaneous fire induced flow fields around all the pool fires were studied using Particle Imaging Velocimetry (PIV).