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Effect of Water and Humidity on Hypergolic Propellant Ignition and Combustion

机译：水分和湿度对高剂量推进剂点火和燃烧的影响

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Triethylamine borane (TEAB) and white fuming nitric acid (WFNA) is a promising hypergolic propellant combination being studied as an alternative to monomethyl hydrazine (MMH) and red fuming nitric acid (RFNA). Nitric acid and MMH are both known to be hygroscopic and their performance is affected by their water content. However, the effect of water on TEAB is yet to be determined. The goal of this research is to characterize the major consequences of water presence on the ignition and combustion performance of TEAB and to compare those results to MMH. TEAB samples are put through accelerated aging in humid and dry environments. Along with the aged TEAB, neat TEAB and neat MMH are used in drop on pool tests with WFNA. The drop tests are conducted by controlling the relative humidity to either below 24% or above 94% and the water concentration in WFNA to either 0% or 10% by weight. Ignition and combustion events are recorded using a photodiode, a microphone, a high speed camera, and a UV streak camera spectrometer. Statistical analysis is applied to the data to determine significant parameters and trends. While relative humidity does not appear to affect the combustion of TEAB with WFNA, water concentration in the oxidizer significantly weakens it. Relative humidity improves MMH ignition delay time and water concentration shows no effect.
机译：三乙胺硼烷（TEAB）和白发烟硝酸（WFNA）是一种有前途的高推进剂组合，目前正在研究中，以取代一甲基肼（MMH）和红发烟硝酸（RFNA）。硝酸和MMH都具有吸湿性，其性能会受到其水分含量的影响。但是，水对TEAB的影响尚待确定。这项研究的目的是表征水的存在对TEAB点火和燃烧性能的主要影响，并将这些结果与MMH进行比较。 TEAB样品在潮湿和干燥的环境中会加速老化。与老化的TEAB一起，在WFNA池测试中使用了纯净的TEAB和纯净的MMH。通过将相对湿度控制在24％以下或94％以上，并将WFNA中的水浓度控制在0％或10％（重量）来进行跌落测试。使用光电二极管，麦克风，高速相机和UV条纹相机光谱仪记录点火和燃烧事件。对数据进行统计分析，以确定重要的参数和趋势。虽然相对湿度似乎不会影响WFNA对TEAB的燃烧，但氧化剂中的水浓度会大大削弱它。相对湿度可改善MMH点火延迟时间，并且水浓度无影响。

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