In order to draw an electric current much more or from a whole flame, it will be necessary to apply a high electric field to a flame. In this case, occuring the growth of ionization, or secondary ionization, the current is a sum of the currents through chemi-ionization and secondary ionization in a flame.
In this paper, the mechanisms of secondary ionization in flames are investigated considering its current-voltage characteristics and electric potcntial distributions butions between electrodes in one-dimentional low pressure flat flames.
The following results are obtained.
1) Secondary ionization in the flame occures between the positive electrode and the flame front and is accounted for by ionization collisions of accelerated electrons with neutral molecules.
2) Ionization coefficient of burned gas is approximately equal to that of air which was measured by Harrison et al.
3) In the current-voltage characteristics of secondary ionization region, the calcu-lated results are agreed well with the measured results.
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