C8H18 和 H2 二元混合燃料燃烧特性的数值研究

IF 1 Q4 TRANSPORTATION SCIENCE & TECHNOLOGY
Bader Almansour
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引用次数: 0

摘要

当今世界对能源需求的不断增长加剧了废气排放,对气候变化产生了重大影响。减少二氧化碳排放的一个可行解决方案是在内燃机中使用氢气和汽油。为了实现这一目标,我们对异辛烷/氢气/空气混合物的燃烧特性进行了数值研究,以确定氢气富集的影响。模拟在开氏 400 度,当量比 0.7 ≤ Ф ≤ 1.4 和压力 1-10 atm 的大范围内进行。通过改变燃料摩尔分数 0% 至 90% 的氢浓度,对绝热火焰温度、热扩散率、层流燃烧速度和化学参与进行了评估。由于热特性和化学参与的变化,人们注意到层燃速度(LBV)随着氢浓度的增加而增加,并随着压力的增加而降低。化学参与和质量扩散是二元燃料混合物层燃速度增加的主要原因。为了避免 NOX 的形成,选择了 Ф = 0.7 和 80% H2 的二元燃料混合物,以提高燃烧强度,同时保持相对较低的火焰温度和 85% 的体积能量密度。结果表明,H、O 和 OH 自由基的浓度随着氢的富集而增加。此外,分析表明,LBV 随自由基的峰值摩尔分数线性增加。通过敏感性分析和净反应速率确定了关键反应。H2 + O H + OH 和 H2 + OH H + H2O 的净反应速率明显增加,这反过来又增加了自由基池。这一点从 H、O 和 OH 自由基的净生成速率的增加可以明显看出。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Investigation of Combustion Characteristics in a Binary Fuel Blend of C 8 H 18 and H 2
The escalating energy demand in today’s world has amplified exhaust emissions, contributing significantly to climate change. One viable solution to mitigate carbon dioxide emissions is the utilization of hydrogen alongside gasoline in internal combustion engines. In pursuit of this objective, combustion characteristics of iso-octane/hydrogen/air mixtures are numerically investigated to determine the impact of hydrogen enrichment. Simulations are conducted at 400 K over a wide range of equivalence ratio 0.7 ≤ Ф ≤ 1.4 and pressure 1–10 atm. Adiabatic flame temperature, thermal diffusivity, laminar burning velocity, and chemical participation are assessed by varying hydrogen concentration from 0 to 90% of fuel molar fraction. As a result of changes in thermal properties and chemical participation, it is noticed that the laminar burning velocity (LBV) increases with higher hydrogen concentration and decreases as pressure increases. Chemical participation and mass diffusion were found to be the main contributors to the LBV increase in binary fuel blends. To circumvent NOX formation, a binary fuel blend at Ф = 0.7 and 80% H2 is selected to increase combustion intensity while maintaining a relatively low flame temperature and retaining 85% of energy density by volume. It is noted that the concentration of H, O, and OH radicals increase with hydrogen enrichment. Furthermore, the analysis revealed that the LBV increases linearly with the peak mole fraction of radicals. Key reactions are identified through sensitivity analysis and net reaction rates. A significant increase in net reaction rate is observed for H2 + O <=> H + OH and H2 + OH <=> H + H2O, which in turn increases the pool of radicals. This is evident by the increase in the net production rate of H, O, and OH radicals.
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来源期刊
SAE International Journal of Fuels and Lubricants
SAE International Journal of Fuels and Lubricants TRANSPORTATION SCIENCE & TECHNOLOGY-
CiteScore
2.20
自引率
10.00%
发文量
16
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