TY - JOUR
T1 - Burning Velocity of Turbulent Methane/Air Premixed Flames in Subatmospheric Environments
AU - Vargas, Arley Cardona
AU - Garciá, Alex M.
AU - Arrieta, Carlos E.
AU - Sierra Del Rio, Jorge
AU - Amell, Andrés
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020
Y1 - 2020
N2 - The aim of our work was to study turbulent premixed flames in subatmospheric conditions. For this purpose, turbulent premixed flames of lean methane/air mixtures were stabilized in a nozzle-type Bunsen burner and analyzed using Schlieren visualization and image processing to calculate turbulent burning velocities by the mean-angle method. Moreover, hot-wire anemometer measurements were performed to characterize the turbulent aspects of the flow. The environmental conditions were 0.85 atm, 0.98 atm, and 295 ± 2 K. The turbulence-flame interaction was analyzed based on the geometric parameters combined with laminar flame properties (which were experimentally and numerically determined), integral length scale, and Kolmogorov length scale. Our results show that the effects of subatmospheric pressure on turbulent burning velocity are significant. The ratio between turbulent and laminar burning velocities increases with turbulence intensity, but this effect tends to decrease as the atmospheric pressure is reduced. We propose a general empirical correlation as a function between ST/SL and u′/SL based on the experimental results obtained in this study and the equivalence ratio and pressure we established.
AB - The aim of our work was to study turbulent premixed flames in subatmospheric conditions. For this purpose, turbulent premixed flames of lean methane/air mixtures were stabilized in a nozzle-type Bunsen burner and analyzed using Schlieren visualization and image processing to calculate turbulent burning velocities by the mean-angle method. Moreover, hot-wire anemometer measurements were performed to characterize the turbulent aspects of the flow. The environmental conditions were 0.85 atm, 0.98 atm, and 295 ± 2 K. The turbulence-flame interaction was analyzed based on the geometric parameters combined with laminar flame properties (which were experimentally and numerically determined), integral length scale, and Kolmogorov length scale. Our results show that the effects of subatmospheric pressure on turbulent burning velocity are significant. The ratio between turbulent and laminar burning velocities increases with turbulence intensity, but this effect tends to decrease as the atmospheric pressure is reduced. We propose a general empirical correlation as a function between ST/SL and u′/SL based on the experimental results obtained in this study and the equivalence ratio and pressure we established.
UR - http://www.scopus.com/inward/record.url?scp=85092336675&partnerID=8YFLogxK
U2 - 10.1021/acsomega.0c02670
DO - 10.1021/acsomega.0c02670
M3 - Artículo
AN - SCOPUS:85092336675
VL - 5
SP - 25095
EP - 25103
JO - ACS Omega
JF - ACS Omega
SN - 2470-1343
IS - 39
ER -