摘要
为增大柴油机缸盖排气道的流量因数、提高柴油机性能,优化某6缸柴油机缸盖排气道结构,试验研究缸盖排气道优化前、后排气流量因数和柴油机性能。试验结果表明:优化后的缸盖排气道平均流量因数提高6.7%;缸盖排气道优化前、后,柴油机进、排气平均压力脉冲均随转矩和转速的增加而增大;缸盖排气道优化后柴油机的平均进气压力大于原缸盖排气道,平均排气压力小于原缸盖排气道;装配优化后缸盖排气道的柴油机燃烧持续期缩短且燃烧中心更接近上止点,NO_(x)排放降低11%~17%,燃油消耗率降低约1 g/(kW·h)。优化后的缸盖排气道有助于改善柴油机充气效率,提高工质的燃烧质量,降低油耗。
In order to enlarge the exhaust flow coefficient of cylinder head exhaust duct and improve diesel engine performance,a 6-cylinder diesel engine is selected as an example,the structure of cylinder head exhaust channel is optimized,and the engine performance before and after the optimization is studied experimentally.The results show that the average flow coefficient of the cylinder head exhaust duct increases by 6.7%after optimization.The mean value of inlet and exhaust pressure pulse both with original and new cylinder head exhaust duct of diesel engine increases with the increase of torque and speed.The average value of intake pressure of the new cylinder head exhaust duct is larger than that of the original one,and the average value of exhaust pressure is smaller.The combustion duration of the new cylinder head exhaust duct is shortened and its combustion center is closer to the top dead center.NO_(x)emissions are reduced by 11%to 17%,and fuel consumption is reduced by about 1 g/(kW·h).New cylinder head exhaust duct is more helpful to improve the diesel engine charging efficiency,improve the combustion quality of the working fluid,and then reduce fuel consumption.
作者
李丽丽
赵鹏
贾锡臣
LI Lili;ZHAO Peng;JIA Xichen(Engine Research Institute,Weichai Power Co.,Ltd.,Weifang 261061,China)
出处
《内燃机与动力装置》
2023年第5期7-12,共6页
Internal Combustion Engine & Powerplant
基金
山东省重点研发计划项目(2020GXGC011004)。
关键词
排气压力
泵气损失
进气流量
缸盖排气道
结构优化
exhaust pressure
pumping loss
air intake flow
cylinder head exhaust duct
structural optimization
