Effects of injection pressure on cavitation and spray in marine diesel engine

被引:12
作者
Yan, Fei [1 ]
Du, Yuchen [1 ]
Wang, Lihui [1 ]
Tang, Wenxian [1 ]
Zhang, Jian [1 ]
Liu, Bo [2 ]
Liu, Chenpeng [2 ]
机构
[1] Jiangsu Univ Sci & Technol, Sch Mech Engn, 2 MengXi Rd, Zhenjiang 212003, Jiangsu, Peoples R China
[2] China Shipbldg Power Engn Inst Co Ltd, Shanghai, Peoples R China
关键词
Numerical simulation; cavitation; spray; penetration; marine diesel engine; COMBUSTION CHARACTERISTICS; NUMERICAL-SIMULATION; FUEL SPRAY; ATOMIZATION; NOZZLE;
D O I
10.1177/1756827716672472
中图分类号
O414.1 [热力学];
学科分类号
摘要
Numerical simulation of the cavitation and spray in a marine diesel engine is performed to investigate the effects of injection pressure on the cavitation flow and spray characteristics in the marine diesel engine, which in turn influence atomization and combustion in the cylinder. A two-phase flow model combined with single bubble dynamics and a droplet break-up model are used to simulate cavitation and spray, respectively, and the results are compared to the experimental data. With increasing injection pressure, the pressure fluctuations inside the nozzle become more intense. The spray penetration is proportional to time at the beginning of injection. Higher injection pressure increases the spray angle. In addition, massive structures on spray edge can return to the spray body, whereas the massive structures on the spray head remain unchanged throughout its lifetime. Each additional 20MPa of injection pressure reduces the Sauter mean diameter by approximately 9%.
引用
收藏
页码:186 / 198
页数:13
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