Numerical Simulation Study Of Magnetization Inductively Coupled Discharge Plasma Generation

For hypersonic aircraft,when participating in flying activities in the adjacent space,it will rub against the outer atmosphere and produce a special coating on the outer surface layer-“ plasma sheath ”,this substance may directly communicate the aircraft information And the signals in the flight detection process are severely distorted,resulting in a large change in the characteristics of the information system,and the physical characteristics will also be greatly changed,and may even directly lead to problems such as information communication "black barriers" The information communication between the aircraft and the adjacent ground and the reception of the detection signal line will be seriously affected by this substance.Therefore,for the study of the physical science issues related to the interaction between the plasma sheath and the electromagnetic wave and the physical properties of the sheath in the plasma It is very important,so it is necessary to reproduce the plasma environment on the ground and carry out relevant experimental research work,but currently the plasma generated by the ground device is difficult to have the characteristics of the real plasma sheath and high electron density,so it is proposed to adopt a A method of adding a constant static magnetic field to the outside of an inductively coupled plasma discharge device,that is,a magnetized inductively coupled plasma(Magnetic Inductively Coupled Plasma,MICP)discharge method,to explore a plasma environment that achieves high-density characteristics,so that the real neighboring space is reproduced on the ground Plasma environment becomes possible.The main research contents and contributions of this article are as follows:1.Designed a radio frequency dynamic controllable plasma generating device to realize the dynamic controllable method of plasma electron density.In terms of structural design,radiation shielding treatment and cooling treatment have been completely improved,and microwave interference method and Langmuir dual-probe diagnostic method have been used to analyze the average dynamic plasma electron density generated under different external conditions.Diagnostic comparison;in addition,the use of different frequency waveform signal generators to achieve the dynamics of plasma electron density,and to verify whether the dynamic plasma electron density change frequency and the waveform signal applied on the plasma load change frequency is consistent.Finally,it is shown that the designed RF dynamically controllable plasma generating device realizes the dynamic controllability of the plasma,and the microwave dynamic interference method and the Langmuir dual probe are used to carry out the average dynamic plasma generated under different conditions.Diagnosis and comparison,it is found that the plasma electron density error diagnosed by the two methods is within an order of magnitude,and the frequency of the dynamic plasma electron density generated is consistent with the frequency of the waveform signal applied to the plasma load.it is good.2.Establish a two-dimensional axisymmetric hydrodynamic model of the ICP discharge device,and use related theoretical equations to describe its discharge process,such as the conservation equation of electron mass,the conservation equation of energy between electrons,etc.,and then model and simulate the ICP discharge.The physical characteristics of ICP discharge under different discharge power and other conditions were studied and compared with the actual discharge experiment results of ICP.It was found that as the discharge power and gas pressure continued to increase,the plasma electron density also increased.After the experiment and simulation comparison,the numerical error of the two remained within an order of magnitude,and the accuracy and reliability of the simulation were verified.In addition,on the basis of the above,the appearance design and related parameters of the ICP discharge model are further optimized and improved.The ICP discharge is also modeled and calculated according to the theory of mass conservation equations,and the physical characteristics of the ICP discharge are analyzed and studied from the design of the inductor coil.The research results show that the optimal discharge state exists under different conditions such as the design of the inductance coil,and the plasma electron density obtained at this time is the highest.3.Establish a two-dimensional axisymmetric fluid model of MICP discharge.According to the related particle equation,the principle and method of MICP discharge are described.The difference from ICP discharge is that MICP is affected by the application of a constant static magnetic field.The plasma properties change from isotropic to anisotropic.Numerical simulation,the physical characteristics of MICP discharge under different input conditions and different external static magnetic field conditions.The research results show that with the continuous increase of discharge power and gas pressure,the plasma electron density also increases.In addition,compared with ICP discharge,the plasma electron density is significantly improved,and the plasma electron density is distributed inside the cavity The shape of has also changed a lot.In summary,the addition of a constant static magnetic field method to the ICP discharge device provides the possibility to further increase the plasma electron density,and provides a new way to generate a real-world plasma environment on the ground.