A Simulation Method of Discharge Process in Discharge Chamber of Kaufmann Ion Thruster
A technology of ion thruster and discharge process, which is applied in the direction of instruments, measuring electricity, measuring electric variables, etc., can solve the problems of many control equations, high efficiency, and huge difference in particle characteristics, so as to improve calculation efficiency, high calculation accuracy, and improve The effect of computing speed
Active Publication Date: 2021-11-19
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Due to the low cost and high efficiency of numerical simulation methods, numerical simulation has always been the main method to study and optimize this process. However, the composition of the plasma in the discharge chamber is complex, the characteristics of different particles vary greatly, and the governing equations describing the discharge process There are many, so it is difficult to develop the simulation model of the discharge chamber; in addition, the Kaufmann ion thruster has non-axisymmetric conditions, such as the non-axisymmetric magnetic field structure in the discharge chamber of the annular ion thruster, so it is necessary to establish a three-dimensional simulation model for research
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[0028] Such as figure 1 Shown is a schematic diagram of the calculation process of the simulation method for the discharge process of the discharge chamber of a Kaufmann ion thruster according to the present invention. The simulation method specifically includes the following steps: Step 1: Calculate the average atomic density in the discharge chamber before ionization according to the flow rate of neutral atoms passing into the discharge chamber; Step 2: Use commercial software Ansys or CST to calculate the static magnetic field in the discharge chamber ; Step 3: From the initial density of atoms and the static magnetic field distribution, use the dynamic method to calculate the distribution of primary electrons and count the ionization rate; Step 4: According to the ionization rate, bring the ionization rate into the plasma diffusion equation and solve it, and estimate the beam current at the same time size; step five: according to the size of the beam current, calculate th...
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The invention relates to a method for simulating the discharge process of a discharge chamber of a Kaufmann ion thruster. It mainly aims at the discharge chamber of a Kaufmann ion thruster, and designs a set of highly efficient simulation methods based on the characteristics of different particles in the discharge chamber. A simulation method for the discharge process of a Ffman ion thruster. It mainly includes the following steps: calculating the initial density of atoms; calculating the static magnetic field distribution; calculating the original electron distribution and counting the ionization rate; solving the plasma diffusion equation and estimating the beam size; calculating the relationship between the atomic flow rate and ion flow rate flowing out of the discharge chamber and the ratio k of the atomic flow rate entering the discharge chamber; judge whether it is converged; if it converges, the convergent solution of the discharge process can be obtained; if it does not converge, correct the neutral atom density, and then recalculate from step three. After the simulation calculation by the above method, the discharge process of the Kaufmann ion thruster can be effectively simulated, and after comparing with the test results, the calculation accuracy is high.
Description
technical field [0001] The invention designs a method for simulating the discharge process of a discharge chamber of a Kaufmann ion thruster, and belongs to the technical field of the Kaufmann ion thruster. Background technique [0002] The plasma generation process is the most important physical process in the Kaufmann ion thruster. The performance of the Kaufmann ion thruster is largely determined by the characteristics of the plasma density and uniformity generated therein. Due to the low cost and high efficiency of numerical simulation methods, numerical simulation has always been the main method to study and optimize this process. However, the composition of the plasma in the discharge chamber is complex, the characteristics of different particles vary greatly, and the governing equations describing the discharge process There are many, so it is difficult to develop the simulation model of the discharge chamber; in addition, the Kaufmann ion thruster has non-axisymmetri...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 陈娟娟鹿畅刘明正曹勇张天平
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH