Twodimensional combustion flame front and temperature profiles of ultra lowcalorific gases in porous combustor are investigated numericallyThe characteristics of the flame front

high temperature profiles under certain operating parameters

and the flame propagation process are examinedThe effects of operating parameters

such as equivalence ratio

superficial velocity of gas and the wall heat loss

on the flame front and hightemperature zone are analyzedThe results show that the shape of the flame front is gradually changed in the propagation process of the flameAccordingly

this process results in the variation of the high temperature zoneAs the equivalence ratio increases

the inclination of the flame front near the wall decreases gradually

while the combustion flame propagates upstream graduallyThe shape of the flame front gradually changes from the trapezoid to the straightline distribution with downward inclination on both sidesThe effect of gas velocity on the shape and position of flame front is contrary to that of the equivalence ratioOn the other hand

the wallheat loss can lead to the inclination of the flame front near the combustor wall

while the effect on the position of flame is less.