Study on the Chemi-ionization Temperature in Flame

Abstract

In order to clear the factor to affect chemi-ionization in a flame, the relation between combustion conditions and ion yielding rate are studied and the position where ionization occurs in a flame is investigated macroscopically in this paper.Experiment are carried out in one dimensional atmospheric and low pressure propane premixed flat flames. Flame temperatures, ion concentrations or saturation currents are measured in atmospheric and low pressure flame under various combustion conditions.The following results are obtained in this experiment.1) The ionization temperature is introduced in order to account for various experimental results.2) The experimental equation concerning ionization of adiabatic flames is expressed in Arrhenius' form by the equivalence ratio and the ionization temperature . The term of activation energy in this equation does not change with the equivalence ratio.3) The relation between the equivalence ratio and the temperature rising ratio to the maximum flame temperature at the position where ionization is affected is inferred in the atmospheric pressure flame and it is proved in low pressure flame.