Abstract
By using a premixed laminar burner, the effect of humidity (H2O) on burning velocity (SL) was investigated. The following was made clear ; (1) As the H2O, CO2 and Ar in mixture is increased, SL decreases in proportion to the quantity of those dilution gases. (2) The heat reaction theory says that mean thermal conductivity (λm), specific heat (Cpm) of mixture and adiabatic flame temperature (Tb) affect SL. As a result of theoretical analysis, the effect of λm and Cpm on SL is less than 1/25 of the effect of Tb, so the effect of λm and Cpm can be ignored. (3) From experimental results, it was confirmed that ln (SL) is proportional to (1/Tb), that is, the effect of H2O on SL is mainly caused by changes of Tb. This conclusion was verified by the fact that increases of H2O, CO2 and Ar decrease the intensity of radiation typical C2, CH and OH in the same manner.
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