| 空气湿度对柴油机NOx和碳烟排放影响的模拟分析 |
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| 引用本文： | 王向丽,王 忠,倪培永,毛功平,魏胜利.空气湿度对柴油机NOx和碳烟排放影响的模拟分析[J].农业工程学报,2012,28(12):68-73. |
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| 作者姓名： | 王向丽 王 忠 倪培永 毛功平 魏胜利 |
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| 作者单位： | 江苏大学汽车与交通工程学院,镇江,212013 |
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| 基金项目： | 国家自然科学基金项目（51106065）；江苏高校优势学科建设工程资助项目（苏政办发〔2011〕6号）；内燃机燃烧学国家重点实验室开放基金项目（K2012-09）；江苏省普通高校研究生科研创新计划资助项目（CXZZ11_0563）。 |
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| 摘 要： | 为了解空气湿度对柴油机排放的影响,该文利用KIVA-3V软件,建立柴油机燃烧过程模型,研究了空气含湿量分别为0、5、10和20g/kg时柴油机NOx和碳烟排放的变化规律,模拟了热物性参数、进气成分、燃烧中间产物演化过程。计算结果表明:随着空气湿度增加,NOx排放近似呈线性减少,含湿量20g/kg时NOx排放可减少30%以上,除大负荷外,湿度对碳烟排放影响均较小。随着湿度增加,除了N2和O2减少,自由基O和OH也会减少。在大负荷、高湿度时,O2浓度的下降并由此引起的碳烟氧化量减少是碳烟生成量增加的重要原因,空气湿度对碳烟排放具有双重影响。
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| 关 键 词： | 柴油机 碳烟 NOx 含湿量 热物性参数 |
| 收稿时间： | 2011/12/4 0:00:00 |
| 修稿时间： | 2012/5/14 0:00:00 |
Simulation analysis of effects of air humidity on NOx and soot emissions in diesel engine |
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| Wang Xiangli,Wang Zhong,Ni Peiyong,Mao Gongping and Wei Shengli.Simulation analysis of effects of air humidity on NOx and soot emissions in diesel engine[J].Transactions of the Chinese Society of Agricultural Engineering,2012,28(12):68-73. |
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| Authors: | Wang Xiangli Wang Zhong Ni Peiyong Mao Gongping and Wei Shengli |
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| Institution: | (School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China) |
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| Abstract: | To understand the effects of air humidity on diesel engine emissions, the NOx and soot emissions were calculated during diesel combustion at different humidity ration (0, 5, 10 and 20 g/kg) using KIVA-3V software. The thermal physical parameters, intake composition and intermediate production were obtained. The simulation results show that NOx decrease linearly with increasing humidity ratio. At the humidity ratio of 20 g/kg, the NOx reduction of more than 30% can be achieved. Except at heavy load, humidity has a little effect on soot. Besides N2 and O2, O and OH radicals are reduced with increasing humidity ratio. At heavy load and high humidity, the decrease of O2 and soot oxidation resulting from decreasing O2 greatly contributes to soot yield. Humidity has dual effects on soot formation. |
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| Keywords: | diesel engines soot NOx humidity ratio thermal physical parameters |
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