Flow effects on flame quenching are not fully understood, especially at low to moderate velocities relevant to safety scenarios. This study investigates the influence of flow velocity on the quenching distance of premixed methane–air mixtures. Experiments were conducted using a parallel-plate apparatus that produces quasi one-dimensional flow at the ignition zone and allows precise control of the electrode gap. Three equivalence ratios (0.77, 0.94, and 1.18) were tested at flow velocities ranging from 0 to 14 m/s, with flame propagation captured by high-speed imaging. The results showed narrower quenching gaps under flow than in quiescent conditions, with variations depending on equivalence ratio.
Suematsu et al. (Wed,) studied this question.