柴油机燃用纳米CeO_2催化柴油的缸内碳烟分布  

Diesel in-cylinder soot distribution with nano-CeO_2 catalyst diesel fuel

作　　者：刘军恒[1] 孟建[1] 孙平[1] 宁海强[1] Liu Junheng Meng Jian Sun Ping Ning Haiqiang(School of Automotive and Traffic Eagineering, Jiangsu University, Zhenjiang 212013, Jiangsu China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《华中科技大学学报（自然科学版）》2017年第7期61-65,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：内燃机燃烧学国家重点实验室开放基金资助项目(K2016-05);江苏省自然科学基金资助项目(BK20160538);江苏省高校自然科学研究重大项目(14KJA470001);江苏省高校自然科学研究面上项目(16KJB470003);江苏大学高级人才科研启动基金资助项目(15JDG163)

摘　　要：利用缸内燃烧可视化技术研究了催化柴油的碳烟生成过程和浓度分布规律,并分析了高压共轨柴油机燃用催化柴油的燃烧特性和烟度排放.结果表明:随着CeO_2质量浓度的增大缸内燃烧时碳烟火焰出现位置提前,消失的时刻更早;与燃用纯柴油相比,催化柴油的缸内碳烟生成区域减小,碳烟浓度降低,碳烟面积占有率比较小,而柴油机排气烟度有所降低,且随着负荷的增加改善效果更明显;纳米CeO_2颗粒会改善燃油燃烧过程并提高放热速率,柴油机燃用催化柴油后燃烧始点提前,缸内压力峰值、放热率峰值和压力升高率峰值均增大,且对应相位更加靠近上止点.The generation process and concentration distribution of in-cylinder soot were investigated on a common-rail diesel engine fueled with catalyst diesel using the visualization technology, and the combustion characteristics and smoke emissions of the diesel engine were also analyzed. Results show that the occurrence location of soot flame is advanced and its vanishing moment comes earlier with the increase of CeO2 ratio. Compared with the pure diesel, soot generation zone, soot concentration and soot area occupation ratio in cylinder are smaller with catalyst diesel. There is an obvious reduction of smoke emissions when diesel engine fueled with catalyst diesel, and the improved effect becomes bet- ter with the increase of engine load. CeO~ nano-particles can increase the heat release rate and improve the fuel combustion process. While the proportion of CeO2 ratio increases, the combustion starting point advances, the peak pressure, the peak heat release rate and the peak pressure rise rate increase in all, and their corresponding phases get close to the top dead center.

关 键 词：柴油机 碳烟 燃烧特性 可视化 催化柴油 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]