两级增压系统对柴油机燃烧及排放特性的影响  

Effect of Two Stage Turbocharger on Combustion and Emission for Diesel Engines

作　　者：马徐林 Ma Xu-lin(Nanjing Jinling Technical Vocational College,Nanjing 210001,China)

机构地区：[1]江苏省南京金陵高等职业技术学校,江苏南京210001

出　　处：《内燃机与配件》2024年第13期24-26,共3页Internal Combustion Engine & Parts

摘　　要：基于原机单级增压柴油机,匹配了2TC1及2TC2两种两级增压系统方案,2TC2高压级压气机流量范围及高效区大于2TC1。相对单级增压系统,两级增压系统压缩终了时压力较高,能够改善燃烧过程,加快燃烧速率,降低后燃比例,降低排气温度。两级增压系统能够明显提升柴油机空燃比及进气流量,从而提高中低转速的扭矩能力,从而使得低速扭矩提升75~115Nm,有效燃油消耗降低10~25g/kW·h。2TC1及2TC2较高的空燃比,使得燃烧较充分,尤其是烟度生成量较低。900rpm时,单级增压系统的烟度为1.5FSN,2TC1及2TC2的烟度仅为0.1FSN。Based on the original single-stage supercharged diesel engine,the 2TC1 and 2TC2 two-stage turbocharger system is matched,and the flow range and efficiency zone of the 2TC2 high-pressure compressor are greater than 2TC1.Compared with the single-stage turbocharger system,The pressure of the two-stage turbocharger system is higher at TDC,that can significantly increase the combustion rate,shorten the combustion duration,reduce the diffusion combustion ratio,and thus reduce the exhaust temperature.The two-stage turbocharger system can significantly improve the air-fuel ratio and intake flow of the diesel engine,thereby improving the torque capacity of the middle and low speed,and effectively improving the fuel consumption of the middle and low speed.The high air-fuel ratio of 2TC1 and 2TC2 makes the combustion more full,especially the smoke generation is low.At 900rpm,the smoke of the single-stage supercharging system is 1.5FSN,and the smoke of 2TC1 and 2TC2 is only 0.1FSN.

关 键 词：两级增压系统 燃烧过程 排放特性 

分 类 号：U464.172[机械工程—车辆工程]