Abstract The propellant synthesis community is constantly looking for green alternative monopropellants. Energetic ionic liquids have several attractive properties such as high energy content, high bulk density, low vapor pressure, high thermal stability, wide liquidus range, low corrosiveness, low toxicity, and ease of handling. The combustion characteristics of an energetic ionic liquid hydroxyethylhydrazinium nitrate (HEHN) was conducted in a pressurized chamber. The performance of HEHN was compared to that of the monopropellant Otto fuel II (OF-II) typically used for torpedo-propulsion. A liquid strand combustion study was performed in an atmosphere of air and nitrogen with chamber pressures varying from 10 to 90 bar. Regressing surface profiles and subsequent burning rates were obtained at different chamber pressures. A B-type thermocouple of 46 µm wire diameter was used to measure the monopropellant flame temperature of HEHN. Thermogravimetric analysis was performed to study the thermal decomposition of HEHN to understand its thermal stability and Fourier transform infrared spectroscopy (FTIR) was utilized to determine the possible reasons behind the high burning rates of HEHN. The gains in the specific impulse and density specific impulse coupled with enhanced burning rates and reasonable thermal stability are expected to establish HEHN as a frontrunner for propulsion and power-generation in oxygen-deficient scenarios.

中文翻译：

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高能离子液体硝酸羟乙基肼作为替代单组元推进剂

摘要 推进剂合成界一直在寻找绿色的替代单推进剂。高能离子液体具有若干吸引人的特性，例如高能量含量、高堆积密度、低蒸气压、高热稳定性、宽液相线范围、低腐蚀性、低毒性和易于处理。高能离子液体硝酸羟乙基肼 (HEHN) 的燃烧特性在加压室中进行。HEHN 的性能与通常用于鱼雷推进的单组元奥托燃料 II (OF-II) 的性能进行了比较。液体股燃烧研究是在空气和氮气气氛中进行的，腔室压力从 10 到 90 巴不等。在不同的燃烧室压力下获得了回归表面轮廓和随后的燃烧速率。使用 46 µm 线径的 B 型热电偶测量 HEHN 的单组元火焰温度。进行热重分析以研究 HEHN 的热分解以了解其热稳定性，并利用傅里叶变换红外光谱 (FTIR) 确定 HEHN 高燃烧率背后的可能原因。比冲和密度比冲的提高，加上燃烧率的提高和合理的热稳定性，有望使 HEHN 成为缺氧情况下推进和发电的领跑者。进行热重分析以研究 HEHN 的热分解以了解其热稳定性，并利用傅里叶变换红外光谱 (FTIR) 确定 HEHN 高燃烧率背后的可能原因。比冲和密度比冲的提高，加上燃烧率的提高和合理的热稳定性，有望使 HEHN 成为缺氧情况下推进和发电的领跑者。进行热重分析以研究 HEHN 的热分解以了解其热稳定性，并利用傅里叶变换红外光谱 (FTIR) 确定 HEHN 高燃烧率背后的可能原因。比冲和密度比冲的提高，加上燃烧率的提高和合理的热稳定性，有望使 HEHN 成为缺氧情况下推进和发电的领跑者。