Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis

Skeen, Scott A.; Yasutomi, Koji

doi:10.1016/j.combustflame.2017.09.030

Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis

Journal Article · Sat Nov 04 20:00:00 EDT 2017 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2017.09.030· OSTI ID:1473931

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Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility

In this paper, soot formation in pyrolyzing sprays of n-dodecane is visualized and quantified in a high-pressure, high-temperature, constant-volume spray chamber at 38 bar, 76 bar, and 114 bar. Sprays of n-dodecane are injected at 500 bar from a single-hole, 186-µm orifice diameter fuel injector. We quantify the temporal evolution of the soot optical thickness and the total soot mass formed in the pyrolyzing sprays using a high-speed extinction imaging diagnostic. The vessel ambient temperature and pressure are varied independently to identify the soot onset temperature for n-dodecane pyrolysis. Linear extrapolation of the maximum soot formation rates as a function of ambient temperature reveals a soot onset temperature near 1450 K. Finally, the onset temperature determined here for n-dodecane is within 50 K of those previously measured along the centerline of atmospheric pressure coflow diffusion flames for smaller alkane fuels.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); SNL Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: NA0003525

OSTI ID:: 1473931

Alternate ID(s):: OSTI ID: 1576831

Report Number(s):: SAND--2018-9941J; 667773

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 188; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Spray penetration, combustion, and soot formation characteristics of the ECN Spray C and Spray D injectors in multiple combustion facilities Maes, Noud; Skeen, Scott A.; Bardi, Michele Applied Thermal Engineering, Vol. 172 https://doi.org/10.1016/j.applthermaleng.2020.115136	journal	May 2020

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Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis

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