中国机械工程2017，Vol.28Issue(18)：2176-2182,7.DOI:10.3969/j.issn.1004-132X.2017.18.005
船用柴油机燃烧室结构分析
Numerical Simulations of Piston Bowl Geometry on Marine Diesel Engines
摘要
Abstract
In order to investigate the effects of piston bowl geometry on the performances and e-missions for large-bore marine diesel engines,six novel combustion chambers were designed based on the combustion chamber of the prototype,and combustion chamber simulation modeling was estab-lished by using AVL five code to simulate the in-cylinder flows,air-fuel mixing and combustion processes with the flow dynamics metrics such as swirl number and uniformity index.Results show that chamber diameter and bowl depth have a great influence on in-cylinder flows.The deeper depth of the re-entrant bowl may result in enhancement of swirl motions and improve the combustions,while a deficient combustion occurs at the lower depth open chamber.Further,high turbulent kinetic energy with a large swirl is important to improve the quality of combustions.It is also found that power out-put of re-entrant chamber G1 is increased by 4.6% and emission is almost the same as the prototype's. NOx emission of straight chamber G4 is decreased by 43.3% at a slightly lower power output than that of the prototype.And open chamber is found to have lower engine-out power.关键词
柴油机/燃烧室形状/涡流数/均匀因子/排放Key words
diesel engine/combustion chamber geometry/swirl number/uniformity index/emissions分类
能源科技引用本文复制引用
赵昌普,孙雅坤,王耀辉,张志刚,朱亚永..船用柴油机燃烧室结构分析[J].中国机械工程,2017,28(18):2176-2182,7.基金项目
国家高技术研究发展计划(863 计划)资助项目(2012AA111705) （863 计划）
