Flame dynamics in a heated meso-scale radial channel

摘要: Abstract Combustion dynamics in a heated meso-scale radial channel made of quartz glass were experimentally investigated. Wall temperature profiles generated by an external heat source to simulate the practical situation heat-recirculating type mini-combustors. It was found that asymmetric stable flames appeared at lower inlet velocities. Moreover, height flame front less than gap distance channel, indicating fuel leakage from exists. At larger velocities, became very unstable. Stochastic transitions between unstable and spiral-like observed captured with image-intensified high-speed video camera. The movie recordings demonstrated formation originates local splitting front. inner moved upstream ignited fresh close it, while outer one can survive burning leaked top disc. Thus, rotating formed. Due unbalance component flow velocity speed, pushed outward merged one, which led regression flame. Numerical study on fields revealed field grows quenching near wall surface are expected play key roles those dynamics.