Tri-electrode sliding discharge(TED)plasma actuators are formed by adding a direct current(DC)exposed electrode to conventional dielectric barrier discharge(DBD)plasma actuators.There are three TED modes depending on ...Tri-electrode sliding discharge(TED)plasma actuators are formed by adding a direct current(DC)exposed electrode to conventional dielectric barrier discharge(DBD)plasma actuators.There are three TED modes depending on the polarity and amplitude of the DC supply:DBD discharge,extended discharge and sliding discharge.This paper evaluates the electrical,aerodynamic and mechanical characteristics of a TED plasma actuator based on energy analysis,particle image velocimetry experiments and calculations using the Navier-Stokes equation.The flow control performances of different discharge modes are quantitatively analyzed based on characteristic parameters.The results show that flow control performance in both extended discharge and sliding discharge is more significant than that of DBD,mainly because of the significantly higher(up to 141%)body force of TED compared with DBD.However,conductivity loss is the primary power loss caused by the DC polarity for TED discharge.Therefore,power consumption can be reduced by optimizing the dielectric material and thickness,thus improving the flow control performance of plasma actuators.展开更多
Plasma flow control is a new type of active flow control approach based on plasma pneumatic actuation.Dielectric barrier discharge(DBD) actuators have become a focus of international aerodynamic research.However,the p...Plasma flow control is a new type of active flow control approach based on plasma pneumatic actuation.Dielectric barrier discharge(DBD) actuators have become a focus of international aerodynamic research.However,the practical applications of typical DBDs are largely restricted due to their limited discharge area and low relative-induced velocity.The further improvement of performance will be beneficial for engineering applications.In this paper,high-speed schlieren and high-speed particle image velocimetry(PIV) are employed to study the flow field induced by three kinds of plasma actuations in a static atmosphere,and the differences in induced flow field structure among typical DBD,extended DBD(EX-DBD),and tri-electrode sliding discharge(TED) are compared.The analyzing of the dynamic evolution of the maximum horizontal velocity over time,the velocity profile at a fixed horizontal position,and the momentum and body force in a control volume reveals that the induced velocity peak value and profile velocity height of EX-DBD are higher than those of the other two types of actuation,suggesting that EX-DBD actuation has the strongest temporal aerodynamic effect among the three types of actuations.The TED actuation not only can enlarge the plasma extension but also has the longest duration in the entire pulsed period and the greatest influence on the height and width of the airflow near the wall surface.Thus,the TED actuation has the ability to continuously influencing a larger three-dimensional space above the surface of the nlasma actuator.展开更多
以Fe、Pt作为催化剂活性组分,以FDU-15介孔碳材料作为载体,载入铁和铂。选用铁含量10%、铂含量5%、焙烧温度600℃下还原铁、350℃下还原铂的纳米零价铁/铂-有序介孔碳复合材料[OMC-Fe（10%）-600-Pt（5%）-350]制成电极片,作为三电极体...以Fe、Pt作为催化剂活性组分,以FDU-15介孔碳材料作为载体,载入铁和铂。选用铁含量10%、铂含量5%、焙烧温度600℃下还原铁、350℃下还原铂的纳米零价铁/铂-有序介孔碳复合材料[OMC-Fe（10%）-600-Pt（5%）-350]制成电极片,作为三电极体系中的工作电极,在溶液化学中寻找最优去除条件。结果表明,在以0.1 M Na Cl作为电解液、初始p H为3、6时,去除容量分别为1 633、1 495 mg/g,对氮气的选择性均达到95%以上,表明此方法能在较宽的p H范围内（3～6）有效的催化去除硝酸盐。展开更多
基金the National Natural Science Foundation of China(Grant Nos.12175177 and 61971345)the Foundation for Key Laboratories of National Defense Science and Technology of China(Grant No.614220120030810)。
文摘Tri-electrode sliding discharge(TED)plasma actuators are formed by adding a direct current(DC)exposed electrode to conventional dielectric barrier discharge(DBD)plasma actuators.There are three TED modes depending on the polarity and amplitude of the DC supply:DBD discharge,extended discharge and sliding discharge.This paper evaluates the electrical,aerodynamic and mechanical characteristics of a TED plasma actuator based on energy analysis,particle image velocimetry experiments and calculations using the Navier-Stokes equation.The flow control performances of different discharge modes are quantitatively analyzed based on characteristic parameters.The results show that flow control performance in both extended discharge and sliding discharge is more significant than that of DBD,mainly because of the significantly higher(up to 141%)body force of TED compared with DBD.However,conductivity loss is the primary power loss caused by the DC polarity for TED discharge.Therefore,power consumption can be reduced by optimizing the dielectric material and thickness,thus improving the flow control performance of plasma actuators.
基金Project supported by the National Natural Science Foundation of China(Grant No.51607188)the Foundation for Key Laboratories of National Defense Science and Technology,China(Grant No.614220202011801)+2 种基金the Shaanxi Provincial Natural Science Basic Research Program,China(Grant No.2019JM-393)the Shaanxi Provincial Key Industry Innovation,Chain(Grant No.2017ZDCXL-GY-06-01)Xi'an Muinicipal Science and Technology Project,China(Grant No.201805037YD15CG21(28)).
文摘Plasma flow control is a new type of active flow control approach based on plasma pneumatic actuation.Dielectric barrier discharge(DBD) actuators have become a focus of international aerodynamic research.However,the practical applications of typical DBDs are largely restricted due to their limited discharge area and low relative-induced velocity.The further improvement of performance will be beneficial for engineering applications.In this paper,high-speed schlieren and high-speed particle image velocimetry(PIV) are employed to study the flow field induced by three kinds of plasma actuations in a static atmosphere,and the differences in induced flow field structure among typical DBD,extended DBD(EX-DBD),and tri-electrode sliding discharge(TED) are compared.The analyzing of the dynamic evolution of the maximum horizontal velocity over time,the velocity profile at a fixed horizontal position,and the momentum and body force in a control volume reveals that the induced velocity peak value and profile velocity height of EX-DBD are higher than those of the other two types of actuation,suggesting that EX-DBD actuation has the strongest temporal aerodynamic effect among the three types of actuations.The TED actuation not only can enlarge the plasma extension but also has the longest duration in the entire pulsed period and the greatest influence on the height and width of the airflow near the wall surface.Thus,the TED actuation has the ability to continuously influencing a larger three-dimensional space above the surface of the nlasma actuator.
文摘以Fe、Pt作为催化剂活性组分,以FDU-15介孔碳材料作为载体,载入铁和铂。选用铁含量10%、铂含量5%、焙烧温度600℃下还原铁、350℃下还原铂的纳米零价铁/铂-有序介孔碳复合材料[OMC-Fe（10%）-600-Pt（5%）-350]制成电极片,作为三电极体系中的工作电极,在溶液化学中寻找最优去除条件。结果表明,在以0.1 M Na Cl作为电解液、初始p H为3、6时,去除容量分别为1 633、1 495 mg/g,对氮气的选择性均达到95%以上,表明此方法能在较宽的p H范围内（3～6）有效的催化去除硝酸盐。
