正庚烷掺混氨/甲醇混合燃料的自燃特性研究
Study on Auto-ignition Characteristics of N-heptane Addition on the Ammonia/Methanol Mixed Fuel
采用快速压缩机在790-1112K，1.5-3.05MPa工况下开展了较少正庚烷（2%摩尔分数）引燃氨/甲醇混合燃料的自燃特性研究，甲醇含量为0-98%，当量比为0.5、1.0和2.0。结果表明，滞燃期（IDT）受到燃料混合比例和当量比的综合影响，浓度为5%的甲醇混合燃料，当量比为1时IDT最短，随着甲醇含量升高，IDT随当量比的增大而缩短。此外，修改了Dong等人的机理，提高了对实验混合物的预测性能。化学反应动力学分析表明，甲醇与氨对于燃烧反应的影响更大，二者的脱氢反应存在HO2等关键自由基的竞争关系从而抑制系统氧化过程。HO2从甲醇中提取H生成H2O2反应敏感性系数很高，是促进燃烧的重要反应。
Arapid compression machine has been applied to measure the auto-ignition characteristics of less n-heptane (2% molar basis) addition to the ammonia/methanol mixed fuel covering temperatures between 790-1112K, pressures of 1.5 and 3.05MPa, equivalence ratios of 0.5, 1.0 and 2.0, andmethanol content of 0-98%. The measurements show that the ignition delay time (IDT) is a complex function of fuel component ratio and stoichiometry. For the 1% CH3OH mixture, the IDT is shortest with stoichiometric. When the methanol content increase, the IDTs decrease monotonically with an increase of equivalence ratios. In addition, a detailed mechanism has been modified to improve the predictive performance of the experimental mixture. The chemical reaction kinetic analysis shows that methanol and ammonia have a greater influence on the combustion reactions than n-heptane. And the dehydrogenation reactions of both compete for key radicals such as HO2, which inhibit the oxidation process of the system. The extraction of H from methanol by HO2 to produce H2O2isrelatively sensitive reaction to promote combustion.
李兴奇;阙锦浩;宋湄葭;王自鑫;冯立岩;
大连理工大学 能源与动力工程学院,大连市116024;大连理工大学 能源与动力工程学院,大连市116024;大连理工大学 能源与动力工程学院,大连市116024;大连理工大学 能源与动力工程学院,大连市116024;大连理工大学 能源与动力工程学院,大连市116024;
TK421+.24
rapid compression machine ammonia methanol n-heptane chemical kinetics
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