Abstract
This paper reports the effects of applying methods of electric field on a sooting diffusion flame. Essentially, two types of electric fields were tested in this experiment. One is a uniform electric field formed between parallel plate electrodes. The other is a non-uniform field formed between needle and plate electrodes. In the uniform field, the flame shape was changed by positive ions moving in the fields. Soot emission was suppressed with increasing the applied voltage, because an increase of the flame surface temperature promoted the soot oxidation. In the non-uniform field, on the contrary, ionic wind was formed by corona discharge. The ionic wind blew from a needle electrode toward a plate electrode, irrespectively of the polarity of the needle. The flame was inclined toward the plate electrode by this ionic wind. As the result, the surrounding air was entrained in the flame, and the suface temperature of flame also increased with increasing applied voltage. The soot suppression efficiency of the non-uniform electric field was higher than that of the uniform one.
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