抄録
Three kinds of general approaches for identifying the flammability limits of combustible mixture, i.e., flames in a
propagation-tube, those in a constant-volume bomb and counterflow flames were introduced. Based on various studies, flammable boundaries of different types of the flames were found to be significantly dependent on the flame configurations due to the combined effects of Lewis number and radiative heat loss. Further understandings accomplished through microgravity experiments, such as SEF (self-extinguishing flame), flame ball and C- & G-curve behavior in counterflow flames were introduced and current limitation of our understandings on the flammability limits were discussed. Finally, future Japanese space experiment for the constructions of the comprehensive flammability-limit theory was introduced.
