TY - JOUR
T1 - Propagation and quenching of premixed flames in a concentration-length-velocity diagram
AU - Jung, Yongjin
AU - Lee, Min Jung
AU - Kim, Nam Il
PY - 2017
Y1 - 2017
N2 - The flame propagation velocity (FPV) deviates from the laminar burning velocity (LBV) when a premixed flame is formulated in a combustion space having limited length-scales. The variation of the FPV depending on the length-scale was experimentally examined using an enhanced state-of-the-art annular stepwise diverging tube. Using a transient method abundant experimental data were obtained for different fuel concentrations establishing a continuous physical surface in a Concentration-Length-Velocity diagram (CLV-diagram). The CLV-diagrams for methane and propane flames are successfully described. Three projected planes of the CLV-diagram are related to conventional laminar flame theories and a comparison of them shows additional hidden mechanisms. The relationship between the critical FPV or LBV and the quenching distances is identified with the Lewis number. The flame stretch and Markstein length with respect to the FPV are discussed.
AB - The flame propagation velocity (FPV) deviates from the laminar burning velocity (LBV) when a premixed flame is formulated in a combustion space having limited length-scales. The variation of the FPV depending on the length-scale was experimentally examined using an enhanced state-of-the-art annular stepwise diverging tube. Using a transient method abundant experimental data were obtained for different fuel concentrations establishing a continuous physical surface in a Concentration-Length-Velocity diagram (CLV-diagram). The CLV-diagrams for methane and propane flames are successfully described. Three projected planes of the CLV-diagram are related to conventional laminar flame theories and a comparison of them shows additional hidden mechanisms. The relationship between the critical FPV or LBV and the quenching distances is identified with the Lewis number. The flame stretch and Markstein length with respect to the FPV are discussed.
KW - Annular stepwise diverging tube
KW - Flame propagation velocity
KW - Laminar burning velocity
KW - Mesoscale combustion
KW - Quenching distance
UR - http://www.scopus.com/inward/record.url?scp=85008626224&partnerID=8YFLogxK
U2 - 10.1016/j.proci.2016.07.094
DO - 10.1016/j.proci.2016.07.094
M3 - Article
AN - SCOPUS:85008626224
SN - 1540-7489
VL - 36
SP - 4243
EP - 4251
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 3
ER -