摘要
为了研究喷雾夹角对某高功率密度单缸机快速燃烧的影响,建立了三种喷雾夹角方案,采用AVL FIRE软件对该单缸机燃烧过程进行了模拟计算,分析了喷雾夹角对喷雾特性以及燃烧性能的影响,仿真结果表明,喷雾夹角主要影响燃油在燃烧室空间的位置及贯穿距,适当增大喷雾夹角,提高了空气利用率,温度场分布均匀,燃油蒸汽分布较好;本机存在喷雾夹角最佳值为155°,使得做功能力接近上止点,燃油消耗率降低了10.7%,燃烧动力性和经济性提升明显。
To look into effects of spray angles on rapid combustion characteristics in HPD diesel engines, 3 spray angle scenarios were built, combustion processes within single-cylinder diesel engines were simulated through the AVL-FIRE software, and effects of different spray angles on both sprayed fuel distribution and combustion characteristics were analyzed. The simulation findings show that spray angles mainly affect positions and penetration distances of the sprayed fuel in the combustion chamber. As spray angle increases, air utilization rate and distributions of both temperature field and fuel vapor will be,correspondingly, improved. At the optimal spray angle of 155°, power capability is close to TDC, and fuel consumption dropped by 10.7% , resulting in considerable improvement in power performance and cost-efficiency.
出处
《柴油机设计与制造》
2017年第1期1-4,9,共5页
Design and Manufacture of Diesel Engine
基金
国家自然科学基金项目资助(51275489)
关键词
柴油机
高功率
喷雾夹角
数值模拟
diesel engine, high power, spray angle, numerical simulation
