TY - CONF
T1 - Effects of inlet flow on combustion characteristics of nheptane droplet in a micro-tube
AU - Yao, Rong
AU - Chen, Xinjian
AU - Li, Junwei
AU - Wang, Ningfei
PY - 2015
Y1 - 2015
N2 - To study effects of fuel flow rate and oxygen concentration on droplet combustion in micro-tube, following experiments were performed by using n-heptane as fuel in a quartz tube of 4mm internal diameter. It was found that, when equivalence ratio was fixed with 0.96, the air flow rate had a great effect on flame position and flame stability. If the fuel flow rate was less than 10 μL/min, there was no droplet on the capillary tip and flame can stably stay in the quartz tube. However, if the fuel rate was larger than 15 μL/min, droplet formed in the straight tube. When the flame stably stayed in the straight tube, the droplet had a great influence on the flame stability in tube. And when the flame was at the exit of the tube, evaporation of fuel film had a great impact on combustion, but droplet's dripping had little impact. At a fixed air flow velocity of 0.33 m/s, we changed oxygen concentration of inlet mixtures of air/oxygen. Increase of the oxygen concentration can reduce the ignition time and make flame stabilize easily in the tube.
AB - To study effects of fuel flow rate and oxygen concentration on droplet combustion in micro-tube, following experiments were performed by using n-heptane as fuel in a quartz tube of 4mm internal diameter. It was found that, when equivalence ratio was fixed with 0.96, the air flow rate had a great effect on flame position and flame stability. If the fuel flow rate was less than 10 μL/min, there was no droplet on the capillary tip and flame can stably stay in the quartz tube. However, if the fuel rate was larger than 15 μL/min, droplet formed in the straight tube. When the flame stably stayed in the straight tube, the droplet had a great influence on the flame stability in tube. And when the flame was at the exit of the tube, evaporation of fuel film had a great impact on combustion, but droplet's dripping had little impact. At a fixed air flow velocity of 0.33 m/s, we changed oxygen concentration of inlet mixtures of air/oxygen. Increase of the oxygen concentration can reduce the ignition time and make flame stabilize easily in the tube.
KW - Flame stability
KW - Micro-scale combustion
KW - N-heptane droplet
KW - Oxygen concentration
UR - http://www.scopus.com/inward/record.url?scp=84947265514&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:84947265514
T2 - 10th Asia-Pacific Conference on Combustion, ASPACC 2015
Y2 - 19 July 2015 through 22 July 2015
ER -