氨滑动弧等离子体激励的数值建模

Numerical Modeling of Ammonia Gliding Arc Plasma Actuation

在双碳背景下,氨的使用及其燃烧难题的解决受到国内外学者的重视。针对改善氨燃烧问题,研究了二维流体动力学-零维反应动力学-燃烧动力学思路,分析了滑动弧等离子体条件下氨的裂解和燃烧特性。利用COMSOL计算软件建立了考虑电磁的二维流体计算模型,研究了滑动弧在反应器中的演化;建立了适用于氨的零维滑动弧模型,研究了滑动弧中全电离-转捩-非平衡3个阶段的温度和组分演化规律;利用CHEMKIN计算软件建立了燃烧模型,评估了等离子体对NH_(3)/air混合气燃烧特性的影响,此外对在混合气中添加CH_(4)进行了分析。结果表明,等离子体能够促进氨的裂解,降低氨的点火延迟时间,并且提高其层流燃烧速度,但是在混合气中将部分等离子体条件下的NH_(3)替换为CH_(4)后,整体燃烧效果有所下降。

The use of ammonia and the solution of its combustion challenges in a two-carbon context have received attention from domestic and foreign scholars.To address the problem of improving ammonia combustion,this study developed a two-dimensional fluid dynamics-zero-dimensional reaction dynamicscombustion dynamics idea to analyze the cracking and combustion characteristics of ammonia under gliding arc plasma conditions.A two-dimensional fluid calculation model considering electromagnetism was developed using COMSOL calculation software to study the evolution of gliding arc in the reactor;A zero-dimensional gliding arc model applicable to ammonia was developed to study the evolution of temperature and components in the three stages of total-ionization,transition and non-equilibrium in the gliding arc;A combustion model was developed using CHEMKIN calculation software to evaluate the effect of plasma on the combustion characteristics of NH_(3)/air mixture,and in addition the addition of CH_(4) to the mixture was also investigated.The results show that plasma can promote the cracking of ammonia,reduce the ignition delay time of ammonia,and increase its laminar burning velocity,but the overall combustion effect decreases after replacing NH_(3) with CH_(4) in the mixture under partial plasma conditions.