Effect of channel gap distance on the flame blow-off limit in mesoscale channels with cavities for premixed CH4/air flames

Effect of solid material on the blow-off limit of CH 4 /air flames in a micro combustor with a plate flame holder and preheating channels

“…Recently, Wan et al [14][15][16] and Yang et al [17] investigated the combustion characteristics of H 2 /air mixtures in micro combustors with cavities, and they confirmed the occurrence of flame tip opening which leads to a decrease in the combustion efficiency. However, for CH 4 /air flames, this phenomenon does not occur and the flame stability was greatly improved [18,19]. The stable symmetric flames were observed in the mesoscale cavity-combustor over a wide range of inlet velocity, which did not appear in the straight channel of the same dimension.…”

Numerical Investigation of the Combustion in an Improved Microcombustion Chamber with Rib

“…e characteristic scale of the microcombustion chamber is substantially larger than the molecular mean-free path of blends. erefore, the gas mixture is regarded as continuous [13][14][15][16].…”

“…Peng et al [12] numerically examined the thermal performance of a microcombustion chamber with and without a front cavity and found that the front cavity enhances the stability of the microcombustor. Wan et al [13][14][15][16] numerically investigated the behavior of an H 2 /air blend in a microcombustion chamber with cavities and found that recirculation and low-velocity zones are formed in the concave cavity. e flame is unstable in the combustor without cavities but can be effectively stabilized in a combustor with cavities.…”

“…us, cavities are included into a planar microcombustor [13][14][15][16]. Moreover, the effect of cavity geometry on combustion performance is evaluated.…”

“…Moreover, the effect of cavity geometry on combustion performance is evaluated. In contrast to previous studies, we improved a microcombustor through the application of a rib on the basis of the literature [13][14][15][16]. ereafter, the current study numerically investigates the combustion performance of the improved microcombustor under various inlet velocities and equivalence ratios.…”