朱涛1,2，杨栋1,2，朱娜1,2
1.内燃机可靠性国家重点实验室，山东 潍坊 261061;2.潍柴动力股份有限公司，山东 潍坊 261061
摘要：在当前配置基础上，利用一维和三维仿真，研究某船用中速柴油机不同高压油泵凸轮型线、喷油器喷孔夹角、活塞顶型线对降低燃油消耗率和气门热负荷的影响。研究结果表明，通过优化油泵凸轮型线和活塞顶型线以及选择小的喷孔夹角，燃油消耗率和气门热负荷分别降低3%和35%，排气门开启时的缸内燃气温度降低50 ℃，有效地降低缸内热负荷，提高气缸盖、气门等零部件可靠性，同时NOx排放水平基本不变，避免对大气环境的危害。
关键词：船用中速柴油机；燃油消耗率；气门热负荷；可靠性
Abstract:Based on a marine mediumspeed diesel engine, the effects of different highpressure fuel pump cam profiles, injector nozzle angles, and piston crown profiles on fuel consumption and valve thermal load are studied. The results show that about 3% fuel consumption rate and 35% valve thermal load can be reduced by optimized matching. When the exhaust valve is opened, the gas temperature in the cylinder is reduced by 50 ℃, which effectively reduces the thermal load in the cylinder and improves the reliability of some critical parts such as cylinder head and valves. At the same time, the NOx emission level is kept basically unchanged to avoid harm to the atmospheric environment.
Keywords:marine mediumspeed diesel engine; fuel consumption rate; valve thermal load; reliability
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