可燃性混合気熱面点火の点火遅れに及ぼす電界の影響  [in Japanese] The Effects of Electric Fields on Ignition Delay of Combustible Mixtures in Hot Surface Ignition  [in Japanese]

The present study was carried out to reveal the possibility of controlling the ignition delay of combustible mixtures by applying electric fields. A thin nickel wire was used as a hot surface to ignite the mixtures. It was suddenly heated up and then its temperature was kept constant. Quiescent propane-air mixtures were used as combustible mixtures. DC electric fields were applied between the nickel wire and the outer electrode plates parallel with the nickel wire. As the applied voltage to the electrode plates increased, both the mean values and the fluctuations of the ignition delay decreased regardless of the electric polarities. Without electric fields, both the mean ignition delay and the fluctuation varied with the equivalence ratio of the mixture. With increasing the applied voltage up to =2kV, the variations became to disappear. When the surface temperature was low, the stoichiometric mixture could be ignited only by applying the electric fields.