TY - JOUR
T1 - Numerical investigation of spray combustion in jet mixing type combustor for low NOx emission
AU - Watanabe, Hirotatsu
AU - Suwa, Yoshikazu
AU - Matsushita, Yohsuke
AU - Morozumi, Yoshio
AU - Aoki, Hideyuki
AU - Tanno, Shoji
AU - Miura, Takatoshi
PY - 2008/6
Y1 - 2008/6
N2 - The present paper describes a numerical investigation of spray combustion in a jet mixing type combustor. In this combustor, kerosene spray was injected with a pressure atomizer, and high speed combustion air was introduced towards the spray flow through some inlet air nozzles to improve mixing of the spray and the air. In the numerical simulation, the conservative equations of mass, momentum and energy in the turbulent flow field were solved in conjunction with the k-ε two equation turbulence model. The effects of the diameter and the number of air inlet nozzles on the combustion behavior and NO emission were numerically investigated. When the diameter of the inlet air nozzle decreased from 8 to 4 mm, the calculated NO mole fraction in the exhaust gas was drastically decreased by about 80%. An increase in the inlet velocity resulted in improvement of the mixing of the spray and the air, and hence, the high temperature region where thermal NO was formed became narrow. As a result, the exhaust NO mole fraction decreased. Furthermore, a decrease in exhaust NO mole fraction was explained by a decrease in the residence time in the high temperature region above 1800 K.
AB - The present paper describes a numerical investigation of spray combustion in a jet mixing type combustor. In this combustor, kerosene spray was injected with a pressure atomizer, and high speed combustion air was introduced towards the spray flow through some inlet air nozzles to improve mixing of the spray and the air. In the numerical simulation, the conservative equations of mass, momentum and energy in the turbulent flow field were solved in conjunction with the k-ε two equation turbulence model. The effects of the diameter and the number of air inlet nozzles on the combustion behavior and NO emission were numerically investigated. When the diameter of the inlet air nozzle decreased from 8 to 4 mm, the calculated NO mole fraction in the exhaust gas was drastically decreased by about 80%. An increase in the inlet velocity resulted in improvement of the mixing of the spray and the air, and hence, the high temperature region where thermal NO was formed became narrow. As a result, the exhaust NO mole fraction decreased. Furthermore, a decrease in exhaust NO mole fraction was explained by a decrease in the residence time in the high temperature region above 1800 K.
KW - Low-NO emission
KW - Numerical simulation
KW - Spray combustion
UR - http://www.scopus.com/inward/record.url?scp=42749088857&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42749088857&partnerID=8YFLogxK
U2 - 10.1016/j.enconman.2007.12.002
DO - 10.1016/j.enconman.2007.12.002
M3 - Article
AN - SCOPUS:42749088857
SN - 0196-8904
VL - 49
SP - 1530
EP - 1537
JO - Energy Conversion and Management
JF - Energy Conversion and Management
IS - 6
ER -
