Research On Atmospheric Pressure Discharge Characteristics Under High-speed Flow And Strong Magnetic Field

The atmospheric pressure discharge is generated and applied in an atmospheric open environment,the plasma generation and maintenance system of atmospheric discharge have a simple structure,which make it has wide application prospects in the industrial and military fields applications.However,the characteristics of atmospheric discharge is easily influenced by the external environment.The atmospheric pressure discharge mechanism and discharge characteristics under different field effects have been the key issues in the study of atmospheric pressure discharge.In this paper,the plasma for aviation applications is as the research objest,the research content is based on the high-speed flow field and strong magnetic field environment.The research contents include the discharge mechanism and discharge characteristics under single field effect and coupled field effect.The velocity of the order of hundreds meter per second in aviation applications is defined as high-speed airflow,and the flight state is at atmospheric pressure.The strong magnetic field refers to a magnetic field environment in a Tesla order of magnitude.This paper starts with understanding the coupling of single field effect and discharge,the influence of flow and strong magnetic field on discharge characteristics is explored,and the nonlinear characteristics of plasma under flow(flow state and flow velocity)transmission and strong magnetic field are revealed.The space-time scale analysis is used to decouple the effects of flow and strong magnetic field on plasma discharge,the discharge characteristics under different time scales for different filed effects are analyzed.The results illustrate that the distribution of large mass particles could be influenced by flow field,and the magnetic field could influence the electrons and the ions distribution in the discharge space.The experimental method is used to further explore the atmospheric pressure discharge mechanism and law under a single strong magnetic field,reveal the discharge mode conversion characteristics under a strong magnetic field,and discuss the effect of magnetic field effects on macroscopic ionic wind characteristics.The influence of magnetic field intensity on discharge process,such as ionization,attachment and drift process are analyzed,and the effect of magnetic field on movement path of particles are also demonstrated.Furthermore,the discharge mechanism under different magnetic field configurations is illustrated by calculating the eletron current and ion current.Based on the above-mentioned flow transport affecting the distribution of large-mass particles in the discharge,the characteristics of the discharge plasma under high-speed flow are further studied in detail.A discharge device with a multielectrode structure is designed by using the flow transport operation and the preionization of energetic particles,and the discharge intensity is increased under airflow.Furthermore,the experimental study based on multi-electrode structure is further extended by experimental research on different discharge conditions.The enhancement and saturation discharge characteristic are illustrated,the influence of electode distance and electrode numbers are studied.The analysis mechanism indicates that the saturation characteristics is related to the particle lifetime in the discharge space.Finally,for the application of magnetohydrodynamics flow control,the discharge characteristics under the coupling of the magnetic field and the flow field and the coupling between the magnetic field and the electric field are analyzed.The discharge mode and discharge enhancement characteristics under the multi-field effect are studied.The stability and enhancement of discharge under multi-field coupling are discussed.The magnetohydrodynamics system is further constructed,the results verify that the two-stage discharge structure under the same area condition can effectively enhance the acceleration effect on the air flow.In this paper,the atmospheric discharge plasma discharge mechanism and discharge characteristics under high-speed flow and strong magnetic field conditions are studied.The typical discharge characteristics and corresponding discharge mechanism under high-speed flow and strong magnetic field conditions are recognized,the experimental results are verified in a magnetohydrodynamics system.The results provide useful support for atmospheric pressure discharge plasma applications.