摘要
以某电控柴油机为对象,利用GT-Power搭建一维仿真模型并利用试验数据完成模型标定,研究不同环境温度、喷油正时对增压压力、爆压、涡前排温、缸盖排温、过量空气系数和油耗的影响;对比等爆压和等正时2种条件下的性能参数,通过计算确定电控柴油机在不同环境温度下的功率。结果表明:环境温度降低,空气密度增大,进气量增加,压比上升,导致柴油机爆压上升、排温下降,反之则进气量减少,压比下降,爆压下降,排温上升。提出喷油正时随环境温度的修正策略,有效改善低温下爆压偏高和高温下排温偏高的问题,结合功率修正,确保柴油机在环境温度5~45℃时额定负荷的爆压与排温均满足设计要求。
Based on an electricity-control diesel engine, a one-dimension model using GT-Power was built and the model calibration was finished with test data. The effect of ambient temperature and inject timing on the simulation, the boost pressure, combustion peak pressure, exhaust temperature at exhaust port and before the turbine, lambda and fuel consumption were studied. Comparing equal combustion peak pressure with equal inject timing, the engine power was calculated at different ambient temperature. The results show that the air density, air input and pressure ratio increase as the ambient temperature decreases, which result in higher combustion peak pressure and lower exhaust temperature. Otherwise, the air density, air input and pressure ratio decrease, combustion peak pressure declines and exhaust temperature rise. An automatic inject time adjustment method is developed in order to control the combustion peak pressure and thermal load, which could ameliorate the high combustion peak pressure with low ambient temperature as well as the high exhaust temperature with high ambient temperature. Combined with power correction, the combustion peak pressure and exhaust temperature of the engine is under the design limit at the ambient temperature from 5 ℃ to 45 ℃.
作者
仲杰
李先南
张文正
陈玮
孙鋆
ZHONG Jie;LI Xiannan;ZHANG Wenzheng;CHEN Wei;SUN Jun(Shanghai Marine Diesel Engine Research Institute,Shanghai 201108, China)
出处
《内燃机与动力装置》
2019年第4期36-40,共5页
Internal Combustion Engine & Powerplant
基金
“十三五”基础产品创新船舶动力基础科研(MPRD)计划项目
关键词
环境温度
柴油机
性能
喷油正时
environment temperature
diesel engine
performance
inject time
