氨与乙醇高温自着火特性试验与动力学分析
Experimental and kinetic study on ignition Characteristics of ammonia/ethanol under high temperature
在当量比为0.5、1.0 和2.0、压力为0.14 和1.0 MPa、温度为1250~1980 K 条件下，利用激波管试验平台测量了氨/乙醇混合气的着火延迟期(IDT)，其中乙醇占总燃料的摩尔分数分别为：0、5%、10%和30%。提出了一个新的氨/乙醇模型(NH3-E)，验证了该模型能够可靠预测试验结果，并利用该模型进行了化学反应动力学分析。研究发现，乙醇对氨的着火延迟期起到显著的非线性促进作用，掺混比为5%(摩尔分数)的乙醇可以使氨/乙醇混合气的着火延迟期缩短65%以上；乙醇早期的消耗迅速产生大量活性自由基是促进氨燃烧的关键因素；随着乙醇的掺混比增加，乙醇被脱氢反应消耗的贡献率增大；添加更大比例(30%)的乙醇，CH3 在自由基池中浓度增加与NH2 发生反应将产生剧毒物种氰化物。
The ignition delay time of ammonia/ethanol mixtures was studied by using shock tube at equivalent ratios of 0.5, 1.0 and 2.0, temperatures of 1250~1980 K, and pressures of 0.14 and 1.0 MPa, the molar fraction of ethanol in the total fuel is 0, 5%, 10% and 30%, respectively. A new ammonia/ethanol model (NH3-E) was proposed, which was proved to be able to predict the experimental results reliably, and the chemical reaction kinetics were performed based on it. The results showed that ethanol has a significant nonlinear promoting effect on the ignition delay time of ammonia. The ignition delay time of ammonia/ethanol mixture can be shortened by more than 65% when the mixture ratio is 5%(molar fraction) of ethanol. The early consumption of ethanol rapidly produces a large number of active free radicals, which is the key factor to promote ammonia combustion. With the increase in the ethanol blending ratio, ethanol consumption becomes more important through H-abstraction. With the addition of a larger percentage (30%) of ethanol, the concentration of CH3 increases in the free radical pool and reacts with NH2 to produce highly toxic species of cyanide.
李新;褚祥林;陈皓;马志豪;王鑫;金亦凡;习志等;胡世纪;
河南科技大学 车辆与交通工程学院,洛阳 471003##宜宾职业技术学院 汽车与轨道交通学院,宜宾 644000;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;河南科技大学 车辆与交通工程学院,洛阳 471003;
TK401
ammonia ethanol shock tube ignition delay chemical kinetics
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