Coflow Combustion in Granulated Ti + xC Mixtures: Boundary Conditions for Convection-Driven Wave Propagation

Abstract

A transition from a conduction-driven to a convection-driven mode of coflow combustion in granulated Ti + 0.5C mixtures was experimentally detected at a pressure drop of around 1 atm. Burning velocity u was found to exhibit quadratic dependence on gas flow rate Q. The behavior of u upon variation in Q, ignition temperature, and combustion temperature was analyzed. The Q values corresponding to a transition from conduction-driven to convection-driven combustion were evaluated theoretically. Theoretical predictions for Ti + 0.5C mixture well agree with experiment.