Spatially resolved measurements of soot volume fraction using laser-induced incandescence

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(94)90029-9· OSTI ID:7184985

Quay, B; Lee, T W; Ni, T; Santoro, R J ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering

Laser-induced incandescence is used to obtain spatially resolved measurements of soot volume fraction in a laminar diffusion flame, in which comparisons with laser scattering/extinction data yield excellent agreement. In addition, the laser-induced incandescence signal is observed to involve a rapid rise in intensity followed by a relatively long (ca. 600 ns) decay period subsequent to the laser pulse, while the effect of laser fluence is manifest in nonlinear and near-saturated response of the laser-induced incandescence signal with the transition occurring at a laser fluence of approximately 1.2 [times] 10[sup 8] W/cm[sup 2]. Spectral response of the laser-induced incandescence involves a continuous spectrum in the visible wavelength range due to the blackbody nature of the emission. Simultaneous measurements of laser-induced incandescence and light scattering yield encouraging results concerning the mean soot particle diameter and number concentration. Thus, laser-induced incandescence can be used as an instantaneous, spatially resolved diagnostic of soot volume fraction without the need for the conventional line-of-sight laser extinction method, while potential applications in two-dimensional imaging and simultaneous measurements of laser-induced incandescence and light-scattering to generate a complete soot property characterization are significant.

• OSTI ID: 7184985
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 97:3-4; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
CONCENTRATION RATIO
ELECTROMAGNETIC RADIATION
EMISSIVITY
KINETICS
LASER RADIATION
MEASURING METHODS
OPTICAL PROPERTIES
PARTICLE SIZE
PHYSICAL PROPERTIES
RADIATIONS
REACTION KINETICS
SIZE
SOOT
SPECTRAL RESPONSE
SURFACE PROPERTIES