Diffusion flame instabilities in a 0.75 mm non-premixed microburner

We examine the cellular instabilities of laminar non-premixed diffusion flames that arise in a polycrystalline alumina microburner with a channel wall gap of dimension 0.75 mm. Changes in the flame structure are observed as a function of the fuel type (H2, CH4, and C3H8) and diluent. The oxidizer is O2/inert. In contrast to previous observations on laminar diffusion flame instabilities, the current instabilities occur in the direction of flow...