TY - JOUR
TI - Experimental study on propane/oxygen and natural gas/oxygen laminar diffusion flames in diluting and preheating conditions
AU - Kashir Babak
AU - Tabejamaat Sadegh
AU - Mohammadi Mohammadreza Baig
JN - Thermal Science
PY - 2012
VL - 16
IS - 4
SP - 1043
EP - 1053
PT - Article
AB - In the present study, propane/oxygen and natural gas/oxygen diffusion flames  within laminar regime have been investigated experimentally to determine the  effects of oxidant preheating and diluting. This research has been divided  into two parts. At first, effect of oxygen dilution with nitrogen and carbon  dioxide gases has been investigated. In this section, stability and flame  configuration variations are studied. Furthermore, it is inferred that  combustion of natural gas and propane with pure oxygen can increase flame  stability against increasing the fuel jet velocities through increasing  burning velocity of the flame as compared with the combustion of natural gas  or propane with normal air. In the other part, oxidant stream preheating up  to 480 K and contemporaneous diluting with nitrogen or carbon dioxide are  investigated and results are compared with non-preheating tests. Preheating  causes more flame stability with respect to dilution process. Also, Due to  combustion products temperature rise and also reduction in ignition delay  time in preheating, these flames are more stable and also visually more  luminous in comparison with normal temperature flames.