抄録
Computational and experimental investigations of radiative counterflow premixed flame at extremely small stretch rate were conducted to clarify the behavior at lower flammability limit. Stretch and radiative extinctions of both Xe-diluted and Kr-diluted counterflow flames were obtained. Flammable region of Xe-diluted counterflow flame was broader than that of Kr-diluted counterflow flame. Lower flammability limit of counterflow planar flame was smaller than that of flame ball using Xe-diluted mixture and larger than that of flame ball using Kr-diluted mixture. These differences of extinction characteristics are due to the lower-Lewis-number of Xe-diluted mixture. Transition from planar flames to a ball-like flame was observed in microgravity experiment and ball-like flame seems to have correlation with flame ball.
