压燃式天然气发动机缸内流动特性  

Simulation on Combustion Characteristics of Compression Ignition Natural Gas Engine with Compound Fuel Supply System

作　　者：郑清平[1] 张惠明[2] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]天津大学内燃机燃烧学国家重点实验室

出　　处：《小型内燃机与摩托车》2009年第5期76-79,共4页Small Internal Combustion Engine and Motorcycle

基　　金：国家自然科学基金资助项目(50276041)

摘　　要：本文提出了一种压燃式天然气发动机燃烧系统,并在不同的燃烧室结构参数下对其燃烧特性和缸内流场分布进行了模拟计算。结果表明,半球型副燃烧室着火性能要优于平底型副燃烧室;较小通道直径有利于抑制燃烧敲缸和扩大功率输出;如果将通道进行适当的右偏移后,在不改变着火性能的基础上,可以有效降低燃烧速率,避免燃烧敲缸。A combustion system for compression ignition natural gas engine is introduced in this paper and the simulation for its combustion characters and flow field inside cylinder is carried out on different geometry parameters of the combustion chamber.The simulation results indicate that semi-ball type combustion chamber is better than flat bottom type chamber in term of ignition performance,and proper positioning of the passage to the right side of chamber can avoid engine knocking by reducing its combustion rate without debasing ignition performance.

关 键 词：天然气发动机 压缩燃烧 模拟计算 燃烧特性 流场 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]