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A numerical investigation of the effect of natural gas substitution ratio (NGSR) on the in-cylinder chemical reaction and emissions formation process in natural gas (NG)-diesel dual fuel engine
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2019-10-19 , DOI: 10.1016/j.jtice.2019.09.021
Yongxiang Zhang , Jianqin Fu , Jun Shu , Mingke Xie , Feng Zhou , Jingping Liu , Dongjian Zeng

In this research, a newly proposed method combining Chemkin with CONVERGE was used to study the transient in-cylinder chemical reaction process in NG-diesel dual fuel engine. The selected mechanism was verified by comparing the results of CONVERGE with experimental data, and then the calibrated model of CONVERGE was used to provide boundary conditions for Chemkin. On this basis, the detailed combustion process was simulated at different natural gas substitution ratio (NGSR). The results show that, the chain branching reaction, long-chain to short-chain reaction, and reactions associated with OH radicals have significant impacts on temperature. It can also be found that the combustion of fuel shows a distinct two-stage reaction process. During the low temperature stage, both the CO and NO emissions are little. While at the high temperature stage, the CO emissions first rapidly increase and then decrease due to the consumption reaction, and the NO emissions also have a quick increase. When the NGSR is reduced, a new path for CO generation occurs at low temperature stage, resulting in minor increase (up to 0.0019 mol fraction) of CO concentration. Meanwhile, the ignition delay is reduced significantly (by 88.5%), but the increase of diesel species does not alter the formation mechanism of emissions. All these provide guidance for improving combustion and emission performance of NG-diesel dual fuel engine.



中文翻译:

天然气(NGSR)-柴油双燃料发动机中天然气替代比(NGSR)对缸内化学反应和排放形成过程影响的数值研究

在这项研究中,一种新提出的将Chemkin与CONVERGE相结合的方法用于研究NG柴油双燃料发动机的瞬态缸内化学反应过程。通过比较CONVERGE的结果与实验数据来验证所选机理,然后使用CONVERGE的校准模型为Chemkin提供边界条件。在此基础上,模拟了不同天然气替代率(NGSR)下的详细燃烧过程。结果表明,链支化反应,长链至短链反应以及与OH自由基相关的反应对温度有显着影响。还可以发现,燃料的燃烧表现出明显的两阶段反应过程。在低温阶段,CO和NO排放均很少。在高温阶段 由于消耗反应,CO排放首先迅速增加然后减少,NO排放也迅速增加。当降低NGSR时,低温阶段会出现一条新的CO生成路径,导致CO浓度略有增加(最高0.0019摩尔分数)。同时,点火延迟显着减少(减少了88.5%),但是柴油种类的增加并没有改变排放物的形成机理。这些都为改善NG柴油双燃料发动机的燃烧和排放性能提供了指导。0019摩尔分数)的CO浓度。同时,点火延迟显着减少(减少了88.5%),但是柴油种类的增加并没有改变排放物的形成机理。这些都为改善NG柴油双燃料发动机的燃烧和排放性能提供了指导。0019摩尔分数)的CO浓度。同时,点火延迟显着减少(减少了88.5%),但是柴油种类的增加并没有改变排放物的形成机理。这些都为改善NG柴油双燃料发动机的燃烧和排放性能提供了指导。

更新日期:2019-10-19
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