Influences of excess air coefficient on combustion and emission performance of diesel pilot ignition natural gas engine by coupling computational fluid dynamics with reduced chemical kinetic model
Influences of excess air coefficient on combustion and emission performance of diesel pilot ignition natural gas engine by coupling computational fluid dynamics with reduced chemical kinetic model
复制标题
计算流体动力学与简化化学动力学模型耦合过量空气系数对柴油引燃天然气发动机燃烧和排放性能的影响
DOI：
10.1016/j.enconman.2019.03.047
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发表时间：
2019-05
影响因子：
10.4
通讯作者：
Sid Martin Becker
中科院分区：
文献类型：
--
作者：
Jun Shu;Jianqin Fu;Jingping Liu;Shuqian Wang;Yanshan Yin;Banglin Deng;Sid Martin Becker
采用计算流体力学的方法，结合简化的化学动力学模型，研究了稀燃对柴油机预燃式天然气发动机燃烧和排放性能的影响。基于台架试验结果，对计算流体力学模型在四种典型工况下进行了验证，并对不同过剩空气系数下的计算流体力学模型进行了模拟。由于计算流体力学结果的可见性，得到了燃烧介质过程和排放介质产物，并利用这些结果解释了过量空气系数的影响机理。模拟结果表明，在50%负荷下，过量空气系数从1.0增加到1.5时，缸内最大压力增大，燃烧提前，最大燃烧提前9.5°CA。然而，在100%负荷下，燃烧的启动是先提前后延迟的。同时，过量空气系数越大，放热率上升越早。当过量空气系数从1.2增大时，10-50%、50-90%和10-90%的燃烧持续期变长。氮氧化物排放量随着过量空气系数从1.0增加到1.1而增加，如果继续增加则会减少。随着过量空气系数的增加，未燃甲烷排放量先减小后增加。然而，在1500rpm满载时，过量空气系数从1.3变化到1.5时，未燃甲烷排放急剧增加，最大未燃甲烷排放差值达到3233ppm。
Abstract In the presented study, the influence of lean-burn on combustion and emission performance of diesel pilot ignition natural gas engine was investigated by using the method of computational fluid dynamics coupling with the reduced chemical kinetic model. Based on bench tested results, the computational fluid dynamics model was validated in four typical conditions, and then it was used for the simulation at different excess air coefficient. Due to the visibility of computational fluid dynamics results, the combustion medium process and emissions medium products were obtained, which then were used to explain the influence mechanism of excess air coefficient. The simulated results show that, under 50% load, the maximum cylinder pressure becomes larger and the start of combustion is advanced when the excess air coefficient increases from 1.0 to 1.5, and the maximum advance of the start of combustion reaches 9.5 °CA. Nevertheless, under 100% load, the start of combustion is advanced first and then retarded. Meanwhile, the higher the excess air coefficient is, the earlier the heat release rate shoots up. When the excess air coefficient increases from 1.2, the 10–50%, 50–90% and 10–90% combustion duration become longer. The nitrogen oxide emission increases as the excess air coefficient rises from 1.0 to 1.1 but decreases if it continues to increase. The unburned methane emission decreases first and then increases with the increase of the excess air coefficient. Nevertheless, at 1500 rpm and full load, the unburned methane emission shoots up as the excess air coefficient changes from 1.3 to 1.5 and the maximum difference of unburned methane emission reaches 3233 ppm.
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DOI：
10.4271/2011-26-0001
发表时间：
2011-01
期刊：
--
影响因子：
--
作者：
A. Shah.;S. S. Thipse-S.;A. Tyagi;S. Rairikar;K. P. Kavthekar;N. V. Marathe;Padmesh Mandloi
通讯作者：
A. Shah.;S. S. Thipse-S.;A. Tyagi;S. Rairikar;K. P. Kavthekar;N. V. Marathe;Padmesh Mandloi
影响因子：
10.4
作者：
Min Xu;Wei Cheng;Hongfei Zhang;T. An;Shaohua Zhang
通讯作者：
Min Xu;Wei Cheng;Hongfei Zhang;T. An;Shaohua Zhang
新型天然气-柴油旋转发动机中空气-燃料混合和燃烧过程双燃料喷射正时的数值研究
影响因子：
10.4
作者：
Chen Wei;Pan Jianfeng;Fan Baowei;Otchere Peter;Miao Nannan;Lu Yao
通讯作者：
Lu Yao
基于CFD和简化化学动力学模型的喷油器喷雾角度对天然气（NG）-柴油双燃料发动机燃烧和排放特性的影响
影响因子：
11.2
作者：
JunShu
通讯作者：
JunShu
DOI：
10.4271/920579
发表时间：
1992-02
期刊：
SAE transactions
影响因子：
--
作者：
Manuel A. Gonzalez D.;Zhi W. Lian;Rolf D. Reitz
通讯作者：
Manuel A. Gonzalez D.;Zhi W. Lian;Rolf D. Reitz