The transition process in ring-to-volume discharge in H mode in inductively coupled plasma torches at atmospheric pressure is investigated by analyzing the time resolved image taken by a high speed camera. The effects...The transition process in ring-to-volume discharge in H mode in inductively coupled plasma torches at atmospheric pressure is investigated by analyzing the time resolved image taken by a high speed camera. The effects of input power, plasma working gas flow rate, and its composition on the transition dynamics are also discussed.The results show that the discharge plasma has experienced ring discharge, and the development stage diffused from the boundary to the center in the confinement tube, and steady volume discharge after entering the H mode. Increasing input power, sheath gas flow rate and hydrogen contents in plasma working gas are all able to lessen the time consumed in the transition process in ring-to-volume discharge.展开更多
An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed ba...An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed based on the temporal evolution of voltage and current.With the increase of gas flowrate,the quantities of the current and voltage spikes increase in an operation cycle of power supply.The spatial gas temperature distribution is obtained by the gray value method,which basically agrees well with that of determined by the diatomic molecule of OH fitting method in experimental errors.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 21377133,11535003 and 11505223the Provincial Science and Technology Major Project of Anhui Province under Grant No 17030801035the Science and Technology Service Network Initiative of Chinese Academy of Sciences
文摘The transition process in ring-to-volume discharge in H mode in inductively coupled plasma torches at atmospheric pressure is investigated by analyzing the time resolved image taken by a high speed camera. The effects of input power, plasma working gas flow rate, and its composition on the transition dynamics are also discussed.The results show that the discharge plasma has experienced ring discharge, and the development stage diffused from the boundary to the center in the confinement tube, and steady volume discharge after entering the H mode. Increasing input power, sheath gas flow rate and hydrogen contents in plasma working gas are all able to lessen the time consumed in the transition process in ring-to-volume discharge.
文摘An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed based on the temporal evolution of voltage and current.With the increase of gas flowrate,the quantities of the current and voltage spikes increase in an operation cycle of power supply.The spatial gas temperature distribution is obtained by the gray value method,which basically agrees well with that of determined by the diatomic molecule of OH fitting method in experimental errors.
