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Influence of Magnetic Lens on Wall Erosion of Hall Effect Thruster

Author: CaiNingBo
Tutor: YuDaRen
School: Harbin Institute of Technology
Course: Power Machinery and Engineering
Keywords: Hall thruster Wall corrosion Magnetic focusing Morphology Evolution Asymmetry
CLC: V439.2
Type: Master's thesis
Year: 2010
Downloads: 31
Quote: 0
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Abstract


Hall thruster is a class of advanced electric propulsion device, with its advantages of high efficiency, high specific impulse and high reliability have been widely used in satellite position keeping and attitude control, and to become the world's space powers electric propulsion device hot spots. With the continuous development of space technology in recent years, the life of the Hall thruster higher requirements limit the thruster lifetime of many factors, the most serious of high-energy ion sputtering erosion of the channel wall, is believed to affect the thruster life of the most important factors, caused widespread concern of the researchers. Adjusting the magnetic field can be effectively controlled to the ionic characteristics of the incident on the wall surface of. Well focused magnetic field configuration can effectively control the ion beam within the channel characteristics, and decreases the plume angle of divergence, improve the performance of the thruster, and a significant impact on wall corrosion. This paper focuses on magnetic focusing Hall thruster wall corrosion characteristics commence the study demonstrated the magnetic focusing the extent an important role in improving the life of the thruster by numerical and experimental methods mainly include the following: Chapter II of this article first The principle of wall surface corrosion analysis, to determine the corrosion rate of the ions extracted from the model of corrosion parameters, then each of these several parameters analyzed. Secondly, the article summarizes the basic principle of the Hall thruster magnetic focusing, come to adjust the magnetic field can change the conclusion of the potential distribution channel. The next PIC simulation statistics the the incident wall under different magnetic field conditions ion flow parameters, found from the simulation results, to change the degree of magnetic focusing mainly on the entrance wall ion beam current density of great influence, and changing the magnetic field strength little effect on the wall surface of the sputtering. By the ion density in the analysis channel center region distribution and the potential distribution explains the degree of magnetic focusing affect wall corrosion strength reasons. Finally, the evolution of the Ⅱ uygens wall program to simulate the different magnetic field under the conditions of the wall morphology evolution, found that changing the magnetic field to produce different effects of corrosion on the inside and outside wall, and focusing magnetic field configuration allows the inside and outside wall corrosion strength in the lower level. Chapter through experimental means to measure the impact of the external wall of the degree of magnetic focusing ion incident parameters. First of experimentally derived when the degree of change of magnetic focusing plume divergence angle, the variation of the discharge current and the utilization rate of the working fluid. Secondly, through to the outer wall surface of the slits, the portion of the ion extraction into the channel outside the measurement, thereby obtaining a degree of change in case of the outer wall surface at the ion incident parameters with magnetic focusing. The results show that the influence of magnetic focusing of the ion current density, ion energy, and numerical simulation coincide. Finally, the use of spectral methods different degree of magnetic focusing thruster overall corrosion strength were measured. The results showed that when the magnetic focusing channels the corrosion strength is very low, from another angle, that the magnetic focusing on thruster life. Chapter focusing and divergence of the two conditions for the magnetic field the short wall corrosion comparative experiment to study the magnetic degree of focusing on the evolution of the shape of the inner and outer wall and corrosion asymmetry. Magnetic field focusing conditions on experimental results, the internal and external wall emerged as a stable evolution profile curve is convex type; inside and outside the wall showing the evolution of instability, the divergence of the magnetic field profile curve within convex. The magnetic field focusing can effectively reduce the corrosion rate of the outer corners, thereby enhancing the entire life of the thruster. The obvious asymmetry corrosion of the inside and outside wall surfaces are reflected in the different magnetic field configuration, the inner wall surface of the corrosion rate is much larger than the outer wall surface. Analyzed thruster pole design, the annular channel structure, exterior angle evolution characteristics and magnetic mirror effect factors on the inside and outside wall asymmetry corrosion.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Special engine > Plasma engines
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