TY - JOUR
TI - An experimental study of the stability of natural gas and propane turbulent non-premixed flame under diluting condition
AU - Kashir Babak
AU - Tabejamaat Sadegh
AU - Mohammadi Mohammadreza Baig
JN - Thermal Science
PY - 2012
VL - 16
IS - 4
SP - 1055
EP - 1065
PT - Article
AB - The stability behavior of a jet diffusion flame developing in a co-flowing  stream is studied experimentally, using natural gas and propane as fuel  gases. Effects of oxidant and fuel stream velocities and oxidant stream  dilution have been studied. The results of experiments showed that with  increasing fuel jet Reynolds number, there appears along the flame a point  that is accompanied by reaction zone sudden expansion. Flame becomes  turbulent downstream from this point. This point is called transition point.  More increment of fuel jet Reynolds number moves the transition point to the  upstream. Furthermore, two types of stability limits are observed. Blow-off  of the rim-stabilized flame is the first stability limit. The second one is  the break-off or extinction of the turbulent portion of the flame at the  transition point from laminar to turbulent flow. The oxidant and fuel streams  are in environmental temperature. In dilution experiments, the oxidant  primary stream is oxygen that is diluted with nitrogen or carbon dioxide. In  the other experiments oxidant is environmental air.