RANGE OF FLAMMABILITY FOR THE NONADIABATIC SHS FLAME - THEORY AND EXPERIMENTAL COMPARISONS

Nonadiabatic heterogeneous flame propagation and extinction in SHS pro cess is analyzed based on a premixed mode of propagation for the bulk flame supprted by the nonpremixed reaction of dispersed non-metal part icles in the liquid metal. The formulation derived is applicable for a wide range of mixture ratios, allowing for volumetric heat loss, fini te reaction rate at the particle surface, and temperature-sensitive Ar rhenius mass diffusion in the liquid. Not only the range of flammabili ty but also the burning velocity is obtained as functions of mixture r atio, degree of dilution, and non-metal particle size. It is further s hown that the theoretical results agree well with available experiment al data, indicating that the present formulation captures the essentia l features of the nonadiabatic heterogeneous SHS process.