TY - JOUR
T1 - Burnout of soot particles in a two-stage burner with a JP-8 surrogate fuel
AU - Echavarria, Carlos A.
AU - Jaramillo, Isabel C.
AU - Sarofim, Adel F.
AU - Lighty, Jo Ann S.
PY - 2012/7
Y1 - 2012/7
N2 - This work focuses on the understanding of the oxidation of soot particles which were the result of using a JP-8 surrogate fuel in a two-stage burner. The two-stage system consists of an initial premixed burner where soot was generated with an air/fuel mixture, specifically a JP-8 surrogate (m-xylene and n-dodecane), under a variety of conditions. Downstream, the soot-laden combustion gases were passed through a second, flat-flame burner where soot was burned out under fuel-lean or slightly fuel-rich conditions. Soot oxidation in the secondary burner was determined by investigating particle size distribution (PSD), flame temperature, gas-phase composition, soot surface area, and soot morphology and nanostructure as a function of the height above the second burner (HAB). Measurements of soot size distribution and number concentration as a function of the HAB under fuel lean (Φoverall=0.8) and slightly rich (Φoverall=1.14) conditions showed a decrease in particle mean diameter and a significant increase in number concentration in the region where O 2 concentration decreased. In this region, the effectiveness factor for O 2 was found to be 1, indicating the potential for internal oxygen diffusion and burning. This caused both the breakup of the bridges cementing primary particles and the rupture of the primary particles. Higher in the burner, where modeling suggested the presence of OH *, soot oxidation was attributed to OH * mechanisms which are faster as compared to O 2 oxidation.
AB - This work focuses on the understanding of the oxidation of soot particles which were the result of using a JP-8 surrogate fuel in a two-stage burner. The two-stage system consists of an initial premixed burner where soot was generated with an air/fuel mixture, specifically a JP-8 surrogate (m-xylene and n-dodecane), under a variety of conditions. Downstream, the soot-laden combustion gases were passed through a second, flat-flame burner where soot was burned out under fuel-lean or slightly fuel-rich conditions. Soot oxidation in the secondary burner was determined by investigating particle size distribution (PSD), flame temperature, gas-phase composition, soot surface area, and soot morphology and nanostructure as a function of the height above the second burner (HAB). Measurements of soot size distribution and number concentration as a function of the HAB under fuel lean (Φoverall=0.8) and slightly rich (Φoverall=1.14) conditions showed a decrease in particle mean diameter and a significant increase in number concentration in the region where O 2 concentration decreased. In this region, the effectiveness factor for O 2 was found to be 1, indicating the potential for internal oxygen diffusion and burning. This caused both the breakup of the bridges cementing primary particles and the rupture of the primary particles. Higher in the burner, where modeling suggested the presence of OH *, soot oxidation was attributed to OH * mechanisms which are faster as compared to O 2 oxidation.
KW - JP-8
KW - M-Xylene flames
KW - N-Dodecane flames
KW - Soot oxidation
KW - Soot size distribution
UR - http://www.scopus.com/inward/record.url?scp=84860460802&partnerID=8YFLogxK
UR - https://doi.org/10.1016/j.combustflame.2012.03.011
U2 - 10.1016/j.combustflame.2012.03.011
DO - 10.1016/j.combustflame.2012.03.011
M3 - Article
AN - SCOPUS:84860460802
SN - 0010-2180
VL - 159
SP - 2441
EP - 2448
JO - Combustion and Flame
JF - Combustion and Flame
IS - 7
ER -