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The injection of water vapor through the burning surface changes these general characteristics at the base of the flame. The expansion effect of the boiling water disturbs both water and liquid fuel, resulting in an increase of the burning rate. The increase in gas flow shifts the region of high reactivity from... 顯示更多 The injection of water vapor through the burning surface changes these general
characteristics at the base of the flame. The expansion effect of the boiling water
disturbs both water and liquid fuel, resulting in an increase of the burning rate. The
increase in gas flow shifts the region of high reactivity from the burning surface and
increases buoyancy. Such enhancement of the buoyancy is related to the significance
of convection effects on flame evolution. The sharp increase in the flow of volatiles
gives rise to a strong mixing between heptane vapor and entrained air, resulting in a
convective type of mixing rather than from a purely diffusive one, which gives to the
reaction zone a premixed rather than a diffusive character, at least at its base. This is
further confirmed by the bluish color of the flame in this region. One consequence of
this increasing buoyancy and mixing effect is to influence the combustion process:
the combustion efficiency is increased leading in a reduction of both yield of soot and
CO and in an increase in the yield of CO2.
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