Temporally Resolved Radiation Spectra From a Sooting, Turbulent Pool Fire

Infrared radiation spectra from a 1-m diameter, JP-8-fueled, liquid pool fire in nominally quiescent surroundings have been acquired using a novel IR spectrometer. Data were acquired at a rate of 390 spectra/sec allowing for a time-resolved description of the radiation from the fully turbulent fire plume. Results are discussed in terms of an effective homogeneous pathlength and both gray and nongray spectral models, of which the gray model surprisingly fits the data in the soot-dominated regions of the spectrum more effectively. The results from the gray model are used to provide statistical descriptions of the heat transfer from the fire plume in terms of probability density functions (PDFs) of the effective fire temperature and emissivity.