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Abstract
An apparatus has been built and utilized to study stabilized, premixed particle-cloud flames in each of the following three modes: upward propagation or downward propagation under normal gravitational conditions, or microgravity conditions. Results for lycopodium-air flames are reported. The upstream boundary hcat loss measurements have been utilized, along with detailed flame temperature structure, to deduce prominent aspects of the axial and of the omnidirectional heat transfer modes. For lycopodium-air flames, it is found that microgravity conditions yield the highest peak flame temperatures and that downward propagating flames display the lowest peak flame temperatures. Radiative losses are found to be more significant determinants of extinction limits than the axial conductive losses to the flameholder.
