| 袁国存,刘少华,申立中,等.氨/氢/柴油三燃料燃烧机理构建及研究[J].内燃机工程,2024,45(6):48-59. |
| 氨/氢/柴油三燃料燃烧机理构建及研究 |
| Construction and Study of Ammonia/Hydrogen/Diesel Tri-Fuel Combustion Mechanism |
| DOI：10.13949/j.cnki.nrjgc.2024.06.006 |
| 关键词:氨/氢/柴油 燃烧机理 点火延迟时间 层流火焰速度 射流搅拌反应器氧化 |
| Key Words:ammonia/hydrogen/diesel combustion mechanism ignition delaytime laminar flame speed jet stirred reactor oxidation |
| 基金项目:国家自然科学基金项目（52066008）；云南省杨延相专家工作站项目（202205AF150075） |
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| 摘要:使用Chemkin软件中的Reaction Workbench模块，构建了由70种物种和392步基元反应组成的氨/氢/柴油（ammonia/hydrogen/diesel， AHD）三燃料燃烧机理。利用Chemkin软件对AHD机理进行化学动力学验证，同时通过将AHD机理与计算流体力学（computational fluid dynamics， CFD）模型耦合的方法，对发动机不同燃料燃烧模式下的燃烧过程和排放进行对比验证。结果表明，AHD机理对氨、氢、柴油的点火延迟时间、层流火焰传播速度、射流搅拌反应器（jet stirred reactor， JSR）氧化关键组分浓度变化的预测值与试验结果吻合较好，平均误差均在一个数量级内；通过CFD模型与AHD机理耦合，在纯柴油、氨/柴油、氨/氢/柴油三种燃烧模式下，发动机缸内压力和放热率的模拟值与试验结果的变化趋势一致，最大误差均在10%以内。在标定工况（1 800 r/min）下，随着氢能比增大，点火延迟期缩短，燃烧速率加快，CO和碳氢化合物排放逐渐下降，NOx排放呈上升趋势。 |
| Abstract:The ammonia/hydrogen/diesel （AHD） tri-fuel combustion mechanism， consisting of 70 species and 392 steps of elementary reactions， was constructed using the Reaction Workbench module in Chemkin software. Chemkin software was utilized to verify the chemical kinetics of the AHD mechanism， and the combustion process and emission under different fuel combustion modes of the engine were also compared and verified by coupling the AHD mechanism with a computational fluid dynamics （CFD） model. The results show that the predicted values of the AHD mechanism for the ignition delay time， laminar flame propagation speed， and the change of the concentration of the oxidized key components of ammonia， hydrogen， and diesel fuel in the jet stirred reactor （JSR） match well with the experimental results. And the average errors are within one order of magnitude. Through the coupling of the CFD model and AHD mechanism， the engine combustion process and emission under the three combustion modes of diesel fuel only， ammonia/diesel fuel， and ammonia/hydrogen/diesel fuel， can be compared and validated under different fuel combustion modes. The simulated values of the engine in-cylinder pressure and the heat release rate under the three combustion modes are in good agreement with the trend of the experimental results， and the maximum errors are all within 10%. Under the rated operating conditions （1 800 r/min）， with the increase of hydrogen energy ratio， the ignition delay period is shortened， the combustion rate is accelerated， the CO and hydrogencarbon（HC） emissions gradually decrease， and the NOx emissions tend to increase. |
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