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Title: Characterization of soot properties in two-meter JP-8 pool fires.

Abstract

The thermal hazard posed by large hydrocarbon fires is dominated by the radiative emission from high temperature soot. Since the optical properties of soot, especially in the infrared region of the electromagnetic spectrum, as well as its morphological properties, are not well known, efforts are underway to characterize these properties. Measurements of these soot properties in large fires are important for heat transfer calculations, for interpretation of laser-based diagnostics, and for developing soot property models for fire field models. This research uses extractive measurement diagnostics to characterize soot optical properties, morphology, and composition in 2 m pool fires. For measurement of the extinction coefficient, soot extracted from the flame zone is transported to a transmission cell where measurements are made using both visible and infrared lasers. Soot morphological properties are obtained by analysis via transmission electron microscopy of soot samples obtained thermophoretically within the flame zone, in the overfire region, and in the transmission cell. Soot composition, including carbon-to-hydrogen ratio and polycyclic aromatic hydrocarbon concentration, is obtained by analysis of soot collected on filters. Average dimensionless extinction coefficients of 8.4 {+-} 1.2 at 635 nm and 8.7 {+-} 1.1 at 1310 nm agree well with recent measurements in the overfiremore » region of JP-8 and other fuels in lab-scale burners and fires. Average soot primary particle diameters, radius of gyration, and fractal dimensions agree with these recent studies. Rayleigh-Debye-Gans theory of scattering applied to the measured fractal parameters shows qualitative agreement with the trends in measured dimensionless extinction coefficients. Results of the density and chemistry are detailed in the report.« less

Authors:
; ;  [1]
  1. Sandia National Laboratories, Livermore, CA
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
921745
Report Number(s):
SAND2005-0337
TRN: US200806%%25
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; JET ENGINE FUELS; FIRES; SOOT; OPTICAL PROPERTIES; MORPHOLOGY; HEAT TRANSFER; CHEMICAL COMPOSITION; COMBUSTION KINETICS; POLYCYCLIC AROMATIC HYDROCARBONS; Combustion-Testing.; Radiative transfer.; Fires.

Citation Formats

Suo-Anttila, Jill Marie, Jensen, Kirk A, and Blevins, Linda Gail. Characterization of soot properties in two-meter JP-8 pool fires.. United States: N. p., 2005. Web. doi:10.2172/921745.
Suo-Anttila, Jill Marie, Jensen, Kirk A, & Blevins, Linda Gail. Characterization of soot properties in two-meter JP-8 pool fires.. United States. doi:10.2172/921745.
Suo-Anttila, Jill Marie, Jensen, Kirk A, and Blevins, Linda Gail. Tue . "Characterization of soot properties in two-meter JP-8 pool fires.". United States. doi:10.2172/921745. https://www.osti.gov/servlets/purl/921745.
@article{osti_921745,
title = {Characterization of soot properties in two-meter JP-8 pool fires.},
author = {Suo-Anttila, Jill Marie and Jensen, Kirk A and Blevins, Linda Gail},
abstractNote = {The thermal hazard posed by large hydrocarbon fires is dominated by the radiative emission from high temperature soot. Since the optical properties of soot, especially in the infrared region of the electromagnetic spectrum, as well as its morphological properties, are not well known, efforts are underway to characterize these properties. Measurements of these soot properties in large fires are important for heat transfer calculations, for interpretation of laser-based diagnostics, and for developing soot property models for fire field models. This research uses extractive measurement diagnostics to characterize soot optical properties, morphology, and composition in 2 m pool fires. For measurement of the extinction coefficient, soot extracted from the flame zone is transported to a transmission cell where measurements are made using both visible and infrared lasers. Soot morphological properties are obtained by analysis via transmission electron microscopy of soot samples obtained thermophoretically within the flame zone, in the overfire region, and in the transmission cell. Soot composition, including carbon-to-hydrogen ratio and polycyclic aromatic hydrocarbon concentration, is obtained by analysis of soot collected on filters. Average dimensionless extinction coefficients of 8.4 {+-} 1.2 at 635 nm and 8.7 {+-} 1.1 at 1310 nm agree well with recent measurements in the overfire region of JP-8 and other fuels in lab-scale burners and fires. Average soot primary particle diameters, radius of gyration, and fractal dimensions agree with these recent studies. Rayleigh-Debye-Gans theory of scattering applied to the measured fractal parameters shows qualitative agreement with the trends in measured dimensionless extinction coefficients. Results of the density and chemistry are detailed in the report.},
doi = {10.2172/921745},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {2}
}

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