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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); SNL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1473931
Report Number(s):
SAND-2018-9941J
Journal ID: ISSN 0010-2180; 667773
Grant/Contract Number:  
NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 188; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; soot; pyrolysis; high-speed imaging; spray combustion

Citation Formats

Skeen, Scott A., and Yasutomi, Koji. Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis. United States: N. p., 2017. Web. doi:10.1016/j.combustflame.2017.09.030.
Skeen, Scott A., & Yasutomi, Koji. Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis. United States. doi:10.1016/j.combustflame.2017.09.030.
Skeen, Scott A., and Yasutomi, Koji. Sun . "Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis". United States. doi:10.1016/j.combustflame.2017.09.030. https://www.osti.gov/servlets/purl/1473931.
@article{osti_1473931,
title = {Measuring the soot onset temperature in high-pressure n-dodecane spray pyrolysis},
author = {Skeen, Scott A. and Yasutomi, Koji},
abstractNote = {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.},
doi = {10.1016/j.combustflame.2017.09.030},
journal = {Combustion and Flame},
issn = {0010-2180},
number = ,
volume = 188,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
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Cited by: 1 work
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