Experimental and theoretical study of iron and mild steel combustion in oxygen flowsстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2017 г.
Аннотация:The effects of oxygen flow speed and pressure on the iron and mild steel combustion are investigated
experimentally and theoretically. The studied specimens are vertical cylindrical rods subjected
to an axial oxygen flow and ignited at the upper end by laser irradiation. Three main stages of the
combustion process have been identified experimentally: (1) induction period, during which the rod
is heated until an intensive metal oxidation begins at its upper end; (2) static combustion, during
which a laminar liquid “cap” slowly grows on the upper rod end, and, after the liquid cap detachment
from the sample; (3) dynamic combustion, which is characterized by a rapid metal consumption and
turbulent liquid motions. An analytical description of these stages is given. In particular, a model
of the dynamic combustion is constructed based on the turbulent oxygen transport through the liquid
metal-oxide flow. This model yields a simple expression for the fraction of metal burned in the
process and allows one to calculate the normal propagation speed of the solid metal–liquid interface
as a function of the oxygen flow speed and pressure. A comparison of the theory with the experimental
results is made, and its potential application is mentioned.