第34卷(2012)第4期性能与排放
柴油机 Diesel Engine
Vol.34(2012) No.4
均质充量压缩着火燃烧碳氢生成和边界层贡献的试验研究
耿壮壮，吕兴才，广环宇，杨铮，黄震
（上海交通大学机械与动力工程学院，上海200240）
摘要：试验研究了均质充量压缩着火（HCCI)燃烧过程中边界层区城HC生成、分布与消耗历程，考察了边界层各个区域对整体HC排放的贡献比例。为此，在快速压缩机上利用瞬态HC排放仪测量了均质混合气在当量比0.4、不同压缩比下靠近气缸盖底面和气缸体侧面不同距离的各测点在全反应历程内的HC浓度。研究发现：压缩比降低使得边界层效应更加明显；同一工况下，气缸盖底面和气缸体侧面的边界层厚度因受到压缩挤流和壁面传热的影响而不同，气缸体侧面的边界层效应比气缸盖底面的更加显著；靠近气缸盖底面和气缸体侧面2mm以内的区城对整
体HC排放的贡献较高，气缸中心燃烧核心区域贡献较小。关键词：HCCI燃烧；HC；分布；边界层
中图分类号：TK421*.2
文献标识码：A
文章编号：1001-4357(2012)04-000105
Experimental StudyonHCSourcesandBoundary
LayerContributions ofHCCICombustion
GengZhuangzhuang,LvXingcai,GuangHuanyu,YangZheng，HuangZhen(School of Mechanical Engineering, Shanghai Jiaotong University，, shanghai 200240）
Abstract: Experimental study was carried out on HC sources, distribution and consumption of HCCI combustion, and also on HC contributions of different regions of boundary layer. These experiments were conducted on an RCM using a fast response HC detector to measure the HC concentrations of different re-gions near the cylinder head and the cylinder liner during the combustion process with the equivalent ratio of O. 4 and different compression ratios. Experimental results show that: decrease of compression ratio makes the boundary layer contributions bigger: under the same compression ratio, the thickness of the boundary layer near the cylinder head and the cylinder liner is different because of the influences of the swirl flow and the wall heat transfer, the boundary layer effects of the region near the cylinder liner are more obvious than those of the region near the cylinder head; the HC contribution of the regions near both the cylinder head and the cylinder liner with thickness under 2mm is bigger, while the HC contribution of the core combustion region around the cylinder centerline is smaller.
Keywords : Homogenous Charge Compression Ignition (HCCI) combustion; HC; distribution; boundary layer
0引言
传统柴油机具有热效率高、经济性好的优点，收稿日期：2012-02-10
基金项目：国家自然基金资助项目（50976069/E060405）。
但扩散燃烧为主的模式容易产生大量的碳烟和 NO.。HCCI燃烧结合传统的火花点火燃烧和压缩自燃燃烧的优点，不仅热效率与柴油机相当，而且
作者简介：联壮壮（1987-），男，硕士，主要从事内燃机燃烧与排放控制的研究，E-mail：gengzhuang1987@sjtu.edu.cn。