Experimental Study On The Formation Characteristics Of Ozone In Pulsed Dielectric Barrier Discharge

For a long time,ozone has been widely used in the field of industrial,medical,public life.The generating cost is an important factor which restricted its full play to utility.This paper is based on the pulse dielectric barrier discharge form,studies different influence factors(such as pulse peak voltage,pulse polarity,oxygen flow rate,flow pattern,etc.)on the effect of ozone generated,to find a suitable condition for ozone generation,and to reduce production costs.Under the experiment conditions and with oxygen as gas source,the ozone production rises with the rise of pulse peak voltage.Ozone generation yield will increase initially and decrease afterwards with the increase of pulse peak voltage.Compared with single pulse,bipolar pulse has a lower breakdown voltage,higher discharge power and higher ozone concentration,but the ozone generation yield of bipolar pulse is relatively lower.The current waveform of surface dielectric barrier discharge presents more jagged discharge current compared with that of volume dielectric barrier discharge.Under VDBD condition,the different influence on ozone generation caused by positive pulse form and negative pulse form is small,but under the SDBD condition,the imbalance of the pulse of positive and negative,embodies obvious,and has a larger impact on ozone.Positive pulse is more advantageous to obtain high generation yield of ozone.Under the experimental conditions,keep same power supply feature,ozone concentration,the discharge power and pulse frequency is proportional relations.Power frequency changes will not affect the single pulse discharge power.Under the same constant pulse peak voltage,increase the oxygen flow velocity/mass flow rate,will not change the discharge waveform and discharge power.Ozone concentration will decrease with the rise of oxygen flow velocity/mass flow rate.As the oxygen flow rate increases,ozone generation yield will first increase to a certain value,then keep a stable value.Flow fields uniformity has a great influence on ozone generating.The more uniform the flow field is,the better the ozone is produced.When the discharge power becomes greater,the advantage of flow field uniformity is more obvious.Hedge interference flow field also plays an obvious role in promoting ozone generation.Ozone production will increase by 20%-40%by applying simple change of the flow field form,which means a huge potential of flow field optimization to generate more ozone.