In order to study the effect of active species which is produced by AC driving dielectric barrier discharge on the detonation process

we simulated the discharge processes in mixtures of hydrogen and oxygen for different work conditions. Moreover

we analyzed the equivalence ratio

voltage and frequency of power source

and gap between two electrodes. The results show the ionization degree reaches the highest when the equivalence ratio is 4/3; however

it should be noted that the effect of equivalence ratio on the density of atom O and H couples is affected by the gas pressure.The ionization degree increases rapidly with applied voltage

and the excitation frequency should be low. When the gap width is little

two times of discharge appear

and the plasma intensity and extent of first discharge will increase but the second discharge will disappear eventually as the gap width increases. The gap width is the best when just only one discharge occurs. It is suggested that a inlet and combustor of large diameter or width should be applied while a plasma actuator is driven by high applied voltage.