不同天然气缸外/缸内喷射比例对发动机混合性能的影响规律  

Influence of different ratio of natural gas injection outside cylinder/inside cylinder on engine mixing performance

作　　者：杨鑫贺 王煜 盛振宇 王天波 顾琰 嵇苏豪 吴先帅 YANG Xinhe;WANG Yu;SHENG Zhenyu;WANG Tianbo;GU Yan;JI Suhao;WU Xianshuai(School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,江苏常州213001

出　　处：《江苏理工学院学报》2025年第1期52-57,共6页Journal of Jiangsu University of Technology

基　　金：国家自然科学基金项目“基于系统定量评价机制的气体燃料缸内掺混效果混杂定量解耦研究”(52105260);江苏省高等学校大学生创新创业训练计划项目“天然气喷射器的性能优化研究”(202311463076Y);江苏省研究生实践创新计划项目“喷射时刻对部分预混直喷天然气发动机缸内燃烧特性研究”(XSJCX23-13)。

摘　　要：为进一步丰富燃气发动机喷射策略研究,建立了天然气发动机缸外/缸内混合喷射及掺混过程计算流体力学模型,探究不同天然气缸外/缸内喷射比例对发动机混合性能的影响规律。研究结果表明:当缸外天然气供给比例为100%时,点火时刻的燃气混合性能最佳,且燃气分布最为均匀;当缸外/缸内天然气供给比例逐渐下降时,点火时刻燃气的最佳浓度区间占比基本一致,且高浓度甲烷呈沿缸壁顺时针转移的趋势。To further enrich the study of gas engine injection strategy,a computational fluid dynamics model of gas engine out-of-cylinder/in-cylinder mixed injection and the mixing process is established,which is used to explore the influence of different out-of-cylinder/in-cylinder injection ratios on engine mixing performance.The results show that when the gas supply ratio outside the cylinder is 100%,the gas mixing performance is the best and the gas distribution is the most uniform.When the ratio of gas supply outside the cylinder/inside the cylinder gradually decreases,the optimal concentration interval of gas at the ignition time is basically the same,and the high concentration methane tends to transfer clockwise along the cylinder wall.

关 键 词：燃气发动机 喷射策略 喷射比例 混合性能 

分 类 号：U464[机械工程—车辆工程]