期刊
APPLIED OPTICS
卷 50, 期 4, 页码 A49-A59出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.50.000A49
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- United States Department of Energy (DOE) through the Laboratory Directed Research and Development and Engineering Science Research Foundation at Sandia National Laboratories
- DOE National Nuclear Security Administration [DE-AC04-94AL85000]
We present what we believe to be the first application of the laser-induced incandescence (LII) technique to large-scale fire testing. The construction of an LII instrument for fire measurements is presented in detail. Soot volume fraction imaging from 2m diameter pool fires burning blended toluene/methanol liquid fuels is demonstrated along with a detailed report of measurement uncertainty in the challenging pool fire environment. Our LII instrument relies upon remotely located laser, optical, and detection systems and the insertion of water-cooled, fiber-bundle-coupled collection optics into the fire plume. Calibration of the instrument was performed using an ethylene/air laminar diffusion flame produced by a Santoro-type burner, which allowed for the extraction of absolute soot volume fractions from the LII images. Single-laser-shot two-dimensional images of the soot layer structure are presented with very high volumetric spatial resolution of the order of 10(-5) cm(3). Probability density functions of the soot volume fraction fluctuations are constructed from the large LII image ensembles. The results illustrate a highly intermittent soot fluctuation field with potentially large macroscale soot structures and clipped soot probability densities. (C) 2010 Optical Society of America
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