Extinction experiments on counterflow methane-air premixed flame at small stretch rates were conducted under microgravity conditions to measure the fuel concentration of the mixture at extinction over a range of very low stretch rates and to observe extinction characteristics of small stretch-rate flames in which radiative heat loss may be dominant. By employing a low-speed counterflow system and microgravity, it is possible to remove the effects of buoyancy, conductive heat loss to the burner, and flame curvature on the flame extinction simultaneously. Consequently, stable counterflow twin flames at low stretch rates cna be established, and hence excellent conditions for extinction measurements and observations can be realized.
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