隨著衛星推進系統對低毒性、高可靠度與快速啟動技術之需求提升，綠色液態推進劑逐漸成為取代傳統聯胺推進劑的重要發展方向。本研究分別探討 HAN基推進劑SHP163之連續流電解分解特性 ，以及 過氧化氫撞擊煤油凝膠薄膜之自燃點火行為，以了解綠色推進劑之反應啟動與控制機制。
在 HAN基推進劑連續流電解研究中，本研究建置 SHP163連續流電解平台，並透過同步影像、溫度與電流量測分析其分解行為。結果顯示， SHP163可於連續流條件下穩定電解分解，反應過程包含氣泡生成、產物累積及穩態產氣等階段。提高施加電壓可加速反應啟動並提升產氣、溫度及電流響應； 電極材料與極性配置亦會改變反應特性，其中鍍白金電極可提升界面反應活性，且白金位於陽極側時對初期電流響應與反應增強效果最為明顯。鈦電極重複使用性測試則顯示，電極表面 氧化 會影響反應穩定性； 在第三次電解後反應趨於穩定， 然而過低的電壓會導致電解失敗。
在煤油凝膠自燃點火研究中，以煤油為基礎燃料，添加 Thixatrol ST作為結膠劑及 NaBH4作為反應性添加物，製備不同結膠劑含量之煤油凝膠。流變量測結果顯示，凝膠皆具有明顯剪切稀化特性，且結膠劑濃度增加將提升凝膠結構強度。過氧化氫液滴撞擊實驗結果顯示，凝膠結構強度與撞擊速度會共同影響氧化劑與燃料之接觸與混合行為。較低結膠劑濃度有利於液滴穿透與混合，可形成較快速且劇烈之反應；提高撞擊速度則可縮短點火延遲並提升反應強度。依據高速影像分析，本研究將點火行為歸納為體積點火、界面點火及回縮型延遲點火三種模式。
總結來說 ，本研究釐清了凝膠流變性質對過氧化氫自燃點火行為 之影響，並建立SHP163連續流電解分解平台，探討電壓與電極材料對分解特性之作用機制。研究成果可作為未來凝膠式自燃雙基推進劑及 HAN基電解式單基推進器設計與應用之參考。

With the growing demand for safer and more reliable satellite propulsion systems, green liquid propellants have attracted considerable attention as alternatives to conventional hydrazine-based propellants. This study investigates two green propulsion-related ignition and decomposition systems: the continuous-flow electrolytic decomposition of the HAN-based monopropellant SHP163, and the hypergolic ignition of kerosene gel films impacted by hydrogen peroxide droplets. The SHP163 system focuses on the effects of applied voltage and electrode material on continuous electrolytic decomposition behavior, while the kerosene gel system focuses on the effects of gel rheological properties and droplet impact dynamics on hypergolic ignition modes. The results show that voltage and electrode configuration significantly influence gas generation, temperature response, current behavior, and reaction stability during SHP163 electrolysis. In addition, gel structure strongly affects oxidizer penetration, fuel–oxidizer mixing, ignition delay, and ignition mode. These findings provide useful references for the design of gelled hypergolic bipropellant systems and HAN-based electrolytic monopropellant thrusters.

[1] A. Mayer, W. Wieling (2018), Green propulsion research at TNO the netherlands, Transactions on Aerospace Research 4(253), 1-24.
[2] M. Negri (2018), New technologies for ammonium dinitramide based monopropellant thrusters – The project RHEFORM, Acta Astronautica 143, 105-117.
[3] T. Pultarova, Hydrazine ban could cost Europe’s space industry billions. https://spacenews.com/hydrazine-ban-could-cost-europes-space-industry-billions/, access on July 25, 2022.
[4] K. Anflo, T. Grönland, G. Bergman, M. Johansson, R. Nedar, Towards green propulsion for spacecraft with ADN-based monopropellants, AIAA Paper2002-3847, 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Indianapolis, Indiana, July, 2002.
[5] H. McLean, W. Deininger, B. Marotta, R. Spores, R. Masse, T. Smith, M. Deans, J. Yim, G. Williams, J. Sampson, J. Martinez, E. Cardiff, C. Bacha, Green propellant infusion mission program overview, status, and flight operations, AIAA Paper2015-3751, 51st AIAA/SAE/ASEE Joint Propulsion Conference, Orlando, Florida, July, 2015.
[6] H. Shiraiwa, T. Tanaka, T. Furukawa (2019), Green propulsion systems for satellites - development of thrusters and propulsion systems using low-toxicity propellants, Mitsubishi Heavy Industries Technical Review 56(1), 1-7.
[7] D. Meinhardt, S. Christofferson, E. Wucherer and B. Reed (1999), Performance and life testing of small HAN thrusters, 35th Jt. Propuls. Conf. Exhib., American Institute of Aeronautics and Astronautics (AIAA), Los Angeles, AIAA-99-2881.
[8] R. Amrousse, T. Katsumi, N. Azuma and K. Hori (2017), Hydroxylammonium nitrate (HAN)-based green propellant as alternative energy resource for potential hydrazine substitution: from lab scale to pilot plant scale-up, Combustion and Flame 176, 334–348.
[9] K. Hori, T. Katsumi, S. Sawai, N. Azuma, K. Hatai, J. Nakatsuka (2019), HAN‐based green propellant, SHP163 – Its R&D and test in space, Propellants, Explosives, Pyrotechnics 44(9), 1080-1083.
[10] R. Spores, R. Masse, S. Kimbrel, C. McLean (2013), GPIM AF-M315E propulsion system, AIAA Paper2015-3573, 51st AIAA/SAE/ASEE Joint Propulsion Conference, Orlando, Florida, July, 2015.
[11] M. Farshchi, V. Vaezi, B. Shaw (2002), Studies of HAN-based monopropellant droplet combustion, Combustion Science and Technology 174(7), 71–97.
[12] K. Hori, Lessons learned in the thruster tests of HAN. In: D.L Luca, T. Shimada, V. Sinditskii, M. Calabro (eds), Chemical Rocket Propulsion. Springer Aerospace Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-27748-6_33
[13] G. Klingenberg, H. Frieske & H. Rockstroh, Electrical ignition of HAN-based liquid propellants, European Research Office the U.S. Army, DAJA 45-86-C-0029, 1990.
[14] G. Klingenberg, H. Rockstroh, J. Knapton, J. Despirito, H.J. Frieske (1990), Investigation of liquid gun propellants: electrical ignition of LGP 1846, Propellants, Explosives, Pyrotechnics 15(3), 103–114.
[15] G. Risha, R. Yetter, V. Yang (2007), Electrolytic-induced decomposition and ignition of HAN-based liquid monopropellants, International Journal of Energetic Materials and Chemical Propulsion 6, 575−588.
[16] B.P. Mason and C.M. Roland (2019), Solid propellants, Rubber Chemistry and Technology 92(1), 1-24.
[17] M.B. Padwal, B. Natan and D.P. Mishra (2021), Gel propellants, Progress in Energy and Combustion Science 83, 1-150.
[18] E.J. Hopfinger and V. Baumbach (2009), Liquid sloshing in cylindrical fuel tanks, Progress in Propulsion Physics 1, 279-292.
[19] H.G. Bundenberg (1949), A survey of the study objects in this volume, Colloid Science 2, 2-17.
[20] P.H. Hermans (1949), Gels, Colloid Science 2, 483-494.
[21] C.J. Brinker and G.W. Scherer, Sol-gel Science, Boston, USA, Academic Press, 1990.
[22] F. Tepper, M.I. Lerner and D.S. Ginley, Metallic nanopowders: an overview, Dekker Encyclopedia of Nanoscience and Nanotechnology, Boca Raton, USA, CRC Press, 2011.
[23] K. Hodge, T Crofoot and S. Nelson, Gelled propellants for tactical missile applications, AIAA Paper 1999-2976, 1999.
[24] H. Kang, S. Park, Y. Park, J. Lee., Ignition-delay measurement for drop test with hypergolic propellants: Reactive fuels and hydrogen peroxide, Combust. Flame 217 (2020) 306-313.
[25] S. Nath, L. Mallick, J.K. Lefkowitz, Hypergolic ignition response to oxidizer droplet properties, Combust. Flame 258 (2023) 113061.
[26] D.A. Castaneda, B. Natan, Experimental investigation of hydrogen peroxide – solid hydrocarbon hypergolic ignition, Acta Astronautica 158 (2019) 286-295.
[27] D.A. Castaneda, B. Natan, Hypergolic ignition of hydrogen peroxide with various solid fuels, Fuel 316 (2022) 123432.
[28] P. Wasserscheid, T. Welton, Ionic Liquids in Synthesis, Wiley-VCH, New York, 2003.
[29] R. Rogers, K. Seddon, S. Volkov, Green industrial, Applications of Ionic Liquids, Springer, New York, 2003.
[30] Q. Zhang, J. Shreeve (2014), Energetic ionic liquid as explosives and propellant fuels: a new journey of ionic liquid chemistry, Chemcial Review 114(20), 10527-10574.
[31] A. Greer, J. Jacquemin, C. Hardacre (2020), Industrial applications of ionic liquids, Molecules 25(21), 5207.
[32] R. Yetter, V. Yang, I. Aksay and F. Dryer (2005), Meso and micro scale propulsion concepts for small spacecraft, Air Force Office of Scientific Research, AFRL-SR-AR-TR-05-0014.
[33] M.H. Wu, R. Yetter (2009), A novel electrolytic ignition monopropellant microthruster based on low temperature co-fired ceramic tape technology, Lab on a Chip 9, 910−916.
[34] P. Khare, V. Yang, H. Meng, G.A. Risha and R.A. Yetter (2015), Thermal and Electrolytic Decomposition and Ignition of HAN–Water Solutions, Combustion Science and Technology 187, 1065-1078.
[35] W.S. Chai, K.H. Cheah, K.S. Koh, J. Chin and T.F.W.K. Chik (2016), Parametric Studies of Electrolytic Decomposition of Hydroxylammonium Nitrate (HAN) Energetic Ionic Liquid in Microreactor Using Image Processing Technique, Chemical Engineering Journal 296, 19-27.
[36] Y.T. Chou, Electrolytic Decomposition Characteristics of Hydroxylammonium Nitrate Based Propellant, Master Thesis, National Cheng Kung University, Taiwan, 2022.
[37] H. OuYang, Synthesis and atmospheric electrolytic decomposition characteristics of hydroxyl-ammonia nitrate aqueous solutions, Master Thesis, National Cheng Kung University, Taiwan, 2020.
[38] D. Sun, Q. Dai, W. Chai, W. Fang, H. Meng (2022), Experimental studies on parametric effects and reaction mechanisms in electrolytic decomposition and ignition of HAN solutions, ACS Omega 7, 18521-18530.
[39] P. Khare, Decomposition and Ignition of HAN-Based Monopropellants by Electrolysis, Master Thesis, The Pennsylvania State University, U.S.A., 2009.
[40] E. Crisp, Electrocatalytic decomposition of HAN-based ionic liquid oxidizers, Master Thesis, The Pennsylvania State University, U.S.A., 2021.
[41] W. Chai, K. Cheah, H. Meng, G. Li (2019), Experimental and analytical study on electrolytic decomposition of HAN-water solution using graphite electrodes, Journal of Molecular Liquids 293, 111496.
[42] K. Koh, J. Chin, T. Chik (2013), Role of electrodes in ambient electrolytic decomposition of hydroxylammonium nitrate (HAN) solutions, Propulsion and Power Research 2(3), 194−200.
[43] W. Chai, D. Sun, K. Cheah, G. Li, H. Meng (2020), Co-electrolysis-assisted decomposition of hydroxylammonium nitrate−fuel mixtures using stainless steel−platinum electrodes, ACS Omega 5, 19525-19532.
[44] C. Li, Z. Wang, L. Li, Z. Wang, R. Shen, L. T. DeLuca and W. Zhang (2024), Enhancement effect of Mo electrodes on the ignition characteristics of HAN-based gel propellant fuel and its combustion mechanisms, Fuel 374, 132421.
[45] K. Park and T. Kim (2024), Experimental studies on effects of electrode material and voltage on electrolytic decomposition of Hydroxylammonium nitrate solution, Acta Astronautica 216, 267–274.
[46] K.I. Lao, Catalytic Decomposition of HAN-Based Monopropellants with Hexaaluminates, Master Thesis, National Cheng Kung University, Taiwan, 2022.
[47] S. Kang, J. Lee & S. Kwon (2014), Platinum/Barium hexaaluminate catalyst to small-scale hydroxylamine nitrate thrusters application, Journal of Propulsion and Power 30(1), 249-251.
[48] S. Kang & S. Kwon (2021), Preparation and performance evaluation of platinum barium hexaaluminate catalyst for green propellant hydroxylamine nitrate thrusters, Materials 14, 2828.
[49] B. Kuo, A study on the electrolytic decomposition of HAN-based propellants for microthruster applications, Master Thesis, The Pennsylvania State University, U.S.A., 2010.
[50] W. Chai, Characterization & analysis on electrolytic decomposition of hydroxylammonium nitrate (HAN) ternary mixtures in microreactors, Ph.D. Dissertation, Univerisity of Nottingham, Malaysia, 2017.
[51] B. Jin, J. Ma, G. Li and H. Li (2024), Ignition and flow combustion characteristics of hydroxylammonium nitrate-based liquid propellant based on electric method, Acta Astronautica 224, 172–182.
[52] B. Jin, W. Wu, G. Li and H. Li (2026), Study on the electric ignition characteristics and flow combustion mechanism of hydroxylammonium nitrate-based liquid propellant for interlaced and opposed electrodes, Acta Astronautica 238, 696–709.
[53] B. Natan, Y. Solomon and V. Perteghella (2011), Hypergolic ignition by fuel gellation and suspension of reactive or catalyst particles, Journal of Propulsion and Power 27(5), DOI: 10.2514/1.B34130.
[54] M. B. Padwal, D. A. Castaneda and B. Natan (2021), Hypergolic combustion of boron based propellants, Proceedings of the Combustion Institute 38, 6703–6711.
[55] R. Madhumitha and S. Karmakar (2024), Boron-loaded gel fuel as potential fuel for ramjet and scramjet engines–recent advancements, FirePhysChem 4(3), 185–200.
[56] Y. Ju, C. Song and B. J. Lee (2024), Guidelines for the safe handling of hypergolic propellants in development of space propulsion systems, Journal of Propulsion and Energy 4(1), 42–57.
[57] D.O. Glushkov, G.V. Kuznetsov, A.G. Nigay, O.S. Yashutina, Heat and mass transfer induced by the ignition of single gel propellant droplets, J. Energy. Inst. 92 (2019) 1944–55.
[58] T.L. Connell Jr., G.A. Risha, R.A. Yetter, B. Natan, Ignition of hydrogen peroxide with gel hydrocarbon fuels, J. Propul. Power 34(1) (2018) 170–181.
[59] T.L. Connell Jr., G.A. Risha, R.A. Yetter, B. Natan, Hypergolic ignition of hydrogen peroxide/gel fuel impinging jets, J. Propul. Power 34(1) (2018) 182–188.
[60] S. Schneider, T. Hawkins, Y. Ahmed, M. Rosander, L. Hudgens and J. Mills (2011), Green bipropellants: hydrogen-rich ionic liquids that are hypergolic with hydrogen peroxide, Angewandte Chemie International Edition 50, 5886–5888.
[61] P. V. Ramachandran, A. S. Kulkarni, M. A. Pfeil, J. D. Dennis, J. D. Willits, S. D. Heister, S. F. Son and T. L. Pourpoint (2014), Amine–boranes: green hypergolic fuels with consistently low ignition delays, Chemistry—A European Journal 20(51), 16869–16872.
[62] B. M. Melof and M. C. Grubelich (2001), Investigation of hypergolic fuels with hydrogen peroxide, Proceedings of the 37th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Salt Lake City, Utah, USA, AIAA 2001.