内燃机工程2025，Vol.46Issue(1)：27-35,9.DOI:10.13949/j.cnki.nrjgc.2025.01.004
高功率密度柴油机缸盖结构对火焰传播的影响分析
Influences of Cylinder Head Structures on Flame Development in High Power Density Diesel Engines
摘要
Abstract
The influence of the cylinder head structure on the combustion state of small bore diesel engines was investigated,as well as the response of chamber shape and injector arrangement to this effect.Firstly,utilizing an open-type combustion chamber,a simulation model of a 135 mm-bore diesel engine was established using closed-valve method and compensated-volume method.And the impact on flame development was compared.The response of stepped and straight combustion chamber shapes was analyzed.Injector settings with different nozzle angles and relative valve declination angles were examined.The results show that the recessed volume of the cylinder head of the small-bore diesel engine accounts for 13.1%at top dead center.With the utilization of the compensated-volume method the peak pressure decreases by 0.473 MPa,and the proportion of post-combustion is exacerbated.The response of different chamber shapes primarily affects the interference between the flame and the cylinder head,resulting in a maximum difference in thermal efficiency of 2.34%.Furthermore,as the nozzle angle increases from 140° to 150°,the difference in post-combustion decreases.Additionally,the asymmetrical arrangement of the nozzle with valves promotes the development of the flame surface,leading to a reduction in fuel consumption by 1.90 g/(kW·h).关键词
高功率密度柴油机/缸盖结构/燃烧室形状/喷孔夹角/喷孔偏角Key words
high power density diesel engine/cylinder head structure/chamber shape/nozzle angle/nozzle deflection angle分类
能源与动力引用本文复制引用
王鑫浩,牛晓晓,刘龙,王洋..高功率密度柴油机缸盖结构对火焰传播的影响分析[J].内燃机工程,2025,46(1):27-35,9.基金项目
国家自然科学基金项目(U2241262)National Natural Science Foundation of China(U2241262) （U2241262）
