Abstract
The purpose of this study is to elucidate flame propagation behavior of three mixtures under application of non-uniform electric field. Three gaseous fuels were mixed with standard air and test fuels were hydrogen, methane and propane. The equivalence ratio of methan-air mixture was 1.05 and equivalence ratio of propain-air mixture was 0.9 becase the flame propagation velocities of methane and propane mixtures were adjusted as same as that of hydrogen-air mixture at equivalence ratio of 0.4. The constant volume combustion chamber was used in test and all tests was carried out at atmospheric pressure and room temerature. The positive or negative non-uniform high-voltage electric fiels were applied to test mixture during combsution by the point-to-plane electrode giometry. The voltage was varied from 0 to 20 kV at every 2 kV. When the positive polarity non-uniform electric field was applied to hydrogen-air mixture, the flame propagation was enhanced because wrinkles on flame were increased by the corona wind. However, the flame propagation of hydrogen-air mixture was not affected by the negative polarity electric field. In case of methane-air mixture, for both polarities, the flame front was lengthened toward electrodes, however the corona wind did not make the wrinkle on the flame front and the combustion was not so enhanced. For propane-air mixture, the combustion was enhanced by both polarity non-uniform electric fields. The corona wind generated the wrinkle on the flame and wrinkles were enhanced by electric field. This is because a lot of ions were included in propain-air mixture flame.
