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研究生：	李天 Mourot, Gildas Daniel Alain
論文名稱：	具有不同電極夾角的脈衝電漿推進器的優化與性能量測 Optimization and performance measurements of the pulsed plasma thruster with various electrode angles
指導教授：	李約亨 Li, Yueh-Heng
共同指導教授:	張博宇 Chang, Po-Yu
學位類別：	碩士 Master
系所名稱：	工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics
論文出版年：	2021
畢業學年度：	109
語文別：	英文
論文頁數：	86
中文關鍵詞：	電力推進、脈衝電漿推進器、電極角度、非對稱擴張角, 田口法、朗繆爾三探針
外文關鍵詞：	electric propulsion, pulsed plasma thruster, electrode angles, asymmetric flare angle, Taguchi method, Langmuir triple probe
相關次數：	點閱：62 下載：3
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脈衝電漿推進器 (PPT) 是一種電力推進裝置，通過脈衝電流和感應磁場之間的相互作用加速電漿產生推力。是太空產業中仍在廣為使用的太空推進技術之一。它們的小尺寸和低推進劑消耗使它們對微型衛星應用非常有吸引力，例如衛星的位置控制、高度控制，甚至行星際任務。它們的設計簡單和低成本，使得它們在中小型太空產業和學術界中更具吸引力。越來越多的關注和發展為衛星推進提供了一個充滿希望的未來。今天，電力推進研究的重點是推進器設計的優化和推進器性能的提高。因此，本研究著重於具有可變電極角度（即對稱或非對稱擴張角）的 PPT 的優化和性能測量，以探討具有三種不同電極角度建構九種不同的配置組合。

使用田口法是以最少的實驗組數進行優化分析，整體實驗組數減少到九種不同的配置，有效率地進行 PPT 推進性能極大化，例如脈衝位和排氣速度，朗繆爾三探針用於測量電漿特性。這允許測量PPT 的電漿參數，包含:脈衝位、排氣速度、電子溫度和電子密度。根據田口法的結果，確定電極角度、放電能量和對稱性對前面提到的四個電漿參數的影響。結果顯示實驗 3（[0;40]，2 J 放電能量）脫穎而出，其脈衝位可達到158.55 μN∙s−1 , 電漿速度為39 071 m∙s−1，電子溫度為18.48 eV, 電子密度為4.95 × 10-20 m−3，每個參數的最佳配置已確定，但驗證的部分尚未完闕。
關鍵字: 電力推進、脈衝電漿推進器、電極角度、非對稱擴張角, 田口法、朗繆爾三探針.

Pulsed Plasma Thrusters (PPT) are electric propulsion devices that produce thrust through the acceleration of plasma by the interaction between pulsed current and induced magnetic fields. They are one of the oldest space propulsion technologies still used in the space industry. Their small size and low propellant consumption make them very attractive for microsatellite applications, such as station keeping, altitude control, or even interplanetary missions. Their design simplicity and low cost make them more attractive in small and medium space enterprises and universities. The increased attention and development offer a promising future for satellite propulsion.

Today, electric propulsion research is focused on the optimization of thruster design and enhancement of thruster performance. Regarding this, this study centers on the optimization and performances measurement of a PPT with variable electrode angles, that is, symmetric or asymmetric flare angle. Three different electrode angles have been studied with nine different configurations, one of which stands out with its performances.

Taguchi method was used in order to maximize the PPT propulsion performance, such as the impulse bit and exhaust velocity, with a minimum of experiment runs, reducing to nine different configurations. A Langmuir triple probe was used to gauge the plasma properties. This allowed the measurement of several PPT parameters such as the impulse bit, exhaust velocity, electron temperature and electron density. According to the result of Taguchi method, the impact of the electrode angles, the discharge energy and the symmetry on the four previously mentioned parameters were determined. Regarding these nine runs, experiment 3 ([0;40], 2 J discharge energy) stands out and produces an impulse bit of 158.55 μN∙s^(-1), a plasma velocity of 39 071 m∙s^(-1), an electron temperature of 18.48 eV, and an electron density of 4.95 〖×10^(-20) m〗^(-3). The optimal configuration for each parameter was determined but not verified.

Keywords: electric propulsion, pulsed plasma thruster, electrode angles, asymmetric flare angle, Taguchi method, Langmuir triple probe.

Abstract	III
摘要	IV
Acknowledgements	V
Content	VI
List of Figures	VIII
List of Tables	IX
Nomenclature	X
List of abbreviations	XI
CHAPTER 1 – INTRODUCTION	1
1.	Electric propulsion	1
2.	Electric propulsion background	1
3.	Types of electric thrusters	2
3. 1.	Electrothermal propulsion	2
3. 2.	Electrostatic propulsion	4
3. 3.	Electromagnetic propulsion	6
4.	Applications of electric propulsion	7
5.	CubeSats and electric propulsion	12
6.	Motivation and Objectives	15
CHAPTER 2 – LITERATURE REVIEW	17
1.	Pulsed plasma thruster	17
1. 1.	Introduction	17
1. 2.	Basic theory	18
1. 3.	Performance improvements	22
2.	Plasma	29
CHAPTER 3 – EXPERIMENTAL APARATUS	31
1.	Vacuum chamber and pump system	31
2.	Thruster design	32
2. 1.	Electrodes	33
2. 2.	PPT Base	34
2. 3.	Sparkplug	34
2. 4.	Nozzles and Sidewalls	36
3.	Circuit design	37
3. 1.	Sparkplug circuit	37
3. 2.	Main circuit	38
4.	Langmuir triple probe	40
5.	Taguchi method	43
CHAPTER 4 – RESULTS AND DISCUSSION	47
1.	Discharge current	47
2.	Langmuir probe measurements	48
2. 1.	Ion current	48
2. 2.	Langmuir probe voltage	48
3.	Current and voltage curves	49
3. 1.	Experiment 1 (0°, 0.5 J, [0;0])	49
3. 2.	Experiment 5 (20°, 1 J, [20;40])	50
3. 3.	Experiment 9 (40°, 2 J, [40;0])	50
4.	Impulse bit	51
5.	Plasma velocity	52
6.	Electron temperature and density	53
6. 1.	Experiment 1	54
6. 2.	Experiment 5	54
6. 3.	Experiment 9	55
7.	Taguchi method	56
7. 1.	Target-value-is-best SN ratio	56
7. 2.	Larger-is-better SN ratio	61
CHAPTER 5 – CONCLUSION AND FUTURE WORK	71
1.	Conclusion	71
2.	Future work	72
APPENDIX	73
Technical drawings	73
Matlab code for the curves	80
REFERENCES	83
                                    

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校內：2023-06-21公開
校外：2023-06-21公開

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