TY - JOUR
TI - Experimental study of the effects of swirl and air dilution on biogas non-premixed flame stability
AU - Rowhani Amir
AU - Tabejamaat Sadegh
JN - Thermal Science
PY - 2015
VL - 19
IS - 6
SP - 2161
EP - 2169
PT - Article
AB - An experimental investigation of the stability limits of biogas in a swirling  non-premixed burner has been carried out. A mixture of 60% methane (CH4) and  40% carbon dioxide (CO2) was used to reach the typical biogas composition.  Vane swirlers with 30º, 45º and 60º angles were used to make the swirling  air. The biogas stability limits and flame behavior under swirling conditions  were tested. Besides, effects of air dilution with nitrogen (N2) and CO2 on  biogas stability limits were investigated. The results show that using swirl  can enhance the flame stability limits approximately four or five times  comparing to non-swirling air stream. Adding N2/CO2 to the air had negative  effects on the flame stability but no changes were observed in the flame  structure. The maximum air dilution was also obtained when 27% and 15% N2 was  added to the swirling air under strong and weak swirl, respectively.