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Method for simulating discharge process of discharge chamber of Kaufman ion thruster

An ion thruster and discharge process technology, applied in instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of many control equations, huge differences in particle characteristics, low cost of numerical simulation methods, etc. effect of speed

Active Publication Date: 2020-04-21
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

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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  • Method for simulating discharge process of discharge chamber of Kaufman ion thruster

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Embodiment Construction

[0027] 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 neutral atom flow rate into the discharge chamber; Step 2: Use commercial software Ansys or CST to calculate the static magnetic field in the discharge chamber ; Step 3: Use the kinetic method to calculate the distribution of primary electrons and count the ionization rate; Step 4: Bring the ionization rate into the plasma diffusion equation and solve it, and estimate the beam size; Step 5: Calculate the atomic flow rate out of the discharge chamber The ratio k to the atomic flow rate entering the discharge chamber; Step 6: After obtaining the ratio k, judge whether |k-1|≤5%; Step 7: If yes, the...

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Abstract

The invention relates to a method for simulating a discharge process of a discharge chamber of a Kaufmann ion thruster, mainly aims at the discharge chamber of the Kaufmann ion thruster and designs aset of efficient method for simulating the discharge process of the Kaufmann ion thruster from the characteristics of different particles in the discharge chamber. The method mainly comprises the following steps of: calculating initial density of atoms; calculating static magnetic field distribution; calculating primary electron distribution and counting an ionization rate; solving a plasma diffusion equation and estimating the size of a beam current; calculating a ratio k of the sum of an atomic flow rate and an ion flow rate flowing out of the discharge chamber to an atomic flow rate entering the discharge chamber; judging whether convergence occurs or not; if so, acquiring a convergence solution of the discharging process; and if not, correcting the neutral atom density, and then recalculating from the step 3. After simulation calculation by adopting the method, the discharge process of the Kaufman ion thruster can be effectively simulated, and the calculation precision is high compared with a test result.

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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Application Information

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Patent Type & Authority Applications(China)
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
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