The effects of positive electric field on the spherical flame propagation at elevated pressures

摘要

The effects of positive DC electric field, which the electric field vector points to the burned region, on the spherical flame propagation at elevated pressures have been investigated. The results show that positive electric field shows similar effects on the enhancement on flame propagation with negative electric field, and the effects of electric field are also evident at high pressures. Cracks on the flame front increase with voltage at high pressures, and it is pronounced at higher pressures and leaner mixtures. The smaller physical scale cracks could be observed at 0.5MPa with 10kV electric field, which is quite different with previous study [8] at 0.2MPa pressure and AC electric field. The flame initiation time, which is analyzed from pressure data, decreases with voltage increases. And it also shows more obvious at higher pressures and leaner mixtures.