The ignition of ammonia in aqueous solution was simulated in a two-stroke compression ignition engine model. Zero-dimensional chemical kinetic calculations were used to estimate the ignition timing of fuel air mixtures in homogeneous charge compression ignition and diesel combustion modes. The fuel consisted of a 25% m/m aqueous solution of ammonia and pure ammonia for comparison. Ignition was studied by varying the geometric compression ratio of the engine. To ignite ammonia in aqueous solution a minimum compression ratio of 25 was necessary under homogeneous charge compression ignition combustion conditions, whereas under diesel combustion conditions a minimum compression ratio of 27 was required. Ammonia containing ammonium nitrite or hydrogen were two potential ammonia derivatives that were shown to enhance aqueous ammonia ignition in the simulations, and allowed ignition to take place at a compression ratio of 24 for diesel combustion. When comparing the ignition of aqueous ammonia solution to pure ammonia, the minimum compression ratio necessary to ignite pure ammonia was approximately 24.8 and that for aqueous ammonia 26.7 in diesel combustion. This led to the conclusion that aqueous ammonia is not prohibitively more difficult to ignite than pure ammonia. Ammonia containing ammonium nitrite or hydrogen were found to be potential pilot fuels.

中文翻译：

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氨水溶液作为船用燃料

在二冲程压缩点火发动机模型中模拟水溶液中氨的点火。零维化学动力学计算用于估计均质充量压缩点火和柴油燃烧模式中燃料空气混合物的点火正时。燃料由氨和纯氨的 25% m/m 水溶液组成以供比较。通过改变发动机的几何压缩比来研究点火。为了在水溶液中点燃氨，在均质充量压缩点火燃烧条件下，最小压缩比需要为 25，而在柴油燃烧条件下，最小压缩比需要为 27。含有亚硝酸铵或氢的氨是两种潜在的氨衍生物，在模拟中显示出可增强氨水点火，并允许在柴油燃烧的压缩比为 24 时发生点火。比较氨水溶液和纯氨的点火，柴油燃烧中纯氨点火所需的最小压缩比约为24.8，氨水为26.7。这导致得出结论，氨水并不比纯氨更难点燃。发现含有亚硝酸铵或氢气的氨是潜在的中试燃料。在柴油燃烧中点燃纯氨所需的最小压缩比约为 24.8，氨水为 26.7。这导致得出结论，氨水并不比纯氨更难点燃。发现含有亚硝酸铵或氢气的氨是潜在的中试燃料。在柴油燃烧中点燃纯氨所需的最小压缩比约为 24.8，氨水为 26.7。这导致得出结论，氨水并不比纯氨更难点燃。发现含有亚硝酸铵或氢气的氨是潜在的中试燃料。