可变截面涡轮增压器与废气再循环对柴油机排放的影响
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摘要
以一台重型柴油机为试验对象,研究可变截面涡轮增压器(VGT)和废气再循环(EGR)阀门开度对柴油机增压比、空燃比、燃油消耗率及NO_x,CO,HC,CO2和烟度等排放特性的影响.研究结果表明,随着EGR阀门开度的增大,增压比、空燃比降低,经济性变差.EGR阀门开度和VGT阀门开度对NO_x排放影响很大,随EGR阀门开度和VGT阀门开度增大,NO_x排放的体积分数显著降低,但HC,CO,CO2的体积分数和烟度升高.为实现降低NO_x排放的同时控制燃油消耗率和烟度的升高,可在中等负荷时选择EGR阀门开度50%、VGT阀门开度45%的控制策略;在高负荷时选择EGR阀门开度75%、VGT阀门开度55%的控制策略.
The effects of variable geometry turbine(VGT)/exhaust gas recirculation(EGR)on pressure ratio,air-fuel ratio,specific fuel consumption,and emissions of NO_x,CO,HC,CO_2 and smoke from a heavy duty diesel engine have been investigated.The results show that pressure ratio and air-fuel ratio decrease,and fuel economy deteriorates with the increase of the opening of the EGR valve.NO_xemission can be strongly affected by the opening of the EGR valve and VGT valve.NO_x emission can be greatly reduced by increasing the opening of the EGR valve and VGT valve,and there is good logarithmic relationship between decline of volume concentration of NO_xand the opening of EGR valve.However,HC,CO,CO_2 and smoke emissions are increased.In order to lower NO_xemission,while effectively controlling fuel economy and smoke emission,50% of the opening of the EGR valve combined with 45% of the opening of the VGT valve is suitable at medium load,and 75% of the opening of the EGR valve combined with 55% of the opening of the VGT valve is suitable at high load.
The effects of variable geometry turbine(VGT)/exhaust gas recirculation(EGR)on pressure ratio,air-fuel ratio,specific fuel consumption,and emissions of NO_x,CO,HC,CO_2 and smoke from a heavy duty diesel engine have been investigated.The results show that pressure ratio and air-fuel ratio decrease,and fuel economy deteriorates with the increase of the opening of the EGR valve.NO_xemission can be strongly affected by the opening of the EGR valve and VGT valve.NO_x emission can be greatly reduced by increasing the opening of the EGR valve and VGT valve,and there is good logarithmic relationship between decline of volume concentration of NO_xand the opening of EGR valve.However,HC,CO,CO_2 and smoke emissions are increased.In order to lower NO_xemission,while effectively controlling fuel economy and smoke emission,50% of the opening of the EGR valve combined with 45% of the opening of the VGT valve is suitable at medium load,and 75% of the opening of the EGR valve combined with 55% of the opening of the VGT valve is suitable at high load.
引文
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[3]Barman J.Effective use of EGR rate to reduce NOxand soot using multiple injections in light commercial diesel engines[C]∥SAE 2013 Commercial Vehicle Engineering Congress and Exposition.Rosemont:SAE International,2013:2013-01-2424.
[4]Brijesh P,Chowdhury A,Sreedhara S.Effect of ultra-cooled EGR and retarded injection timing on low temperature combustion in CI engines[C]∥SAE 2013 World Congress&Exhibition.Detroit:SAE International,2013:2013-01-0321.
[5]Iwata H,Konstandopoulos A,Nakamura K,et al.Experimental study of physical and chemical properties of soot under several EGR conditions[C]∥SAE 2014World Congress&Exhibition.Detroit:SAE International,2014:2014-01-1593.
[6]Asad U,Tjong J.Transient build-up and effectiveness of diesel exhaust gas recirculation[C]∥SAE 2014 World Congress&Exhibition.Detroit:SAE International,2014:2014-01-1092.
[7]Vítek O,Macek J,Poláek M,et al.Comparison of different EGR solutions[C]∥SAE 2008World Congress&Exhibition.Detroit:SAE International,2008:2008-01-0206.
[8]Osada H,Aoyagi Y,Shimada K,et al.Reduction of NOxand PM for a heavy duty diesel using 50%EGR rate in single cylinder engine[C]∥SAE 2010 World Congress&Exhibition.Detroit:SAE International,2010:2010-01-1120.
[9]吴君华,黄震,王天灵.可变喷嘴增压器与增压柴油机的匹配试验研究[J].汽车工程,2005,27(1):40.WU Junhua,HUANG Zhen,WANG Tianling.An experimental study on the matching of variable nozzle turbocharger with turbocharged diesel engine[J].Automotive Engineering,2005,27(1):40.
[10]郭鹏江,王天灵,吴君华,等.可变喷嘴涡轮增压器喷嘴环叶片位置对柴油机性能的影响[J].内燃机工程,2010,31(2):41.GUO Pengjiang,WANG Tianling,WU Junhua,et al.Effect of nozzle ring vane position of VNT on diesel engine performance[J].Chinese Internal Combustion Engine Engineering,2010,31(2):41.
[11]陈贵升,郑尊清,尧命发,等.不同增压方式下EGR对高压共轨柴油机燃烧和排放的影响[J].燃烧科学与技术,2011,17(6):512.CHEN Guisheng,ZHENG Zunqing,YAO Mingfa,et al.Effects of EGR on combustion and emissions of a common-rail diesel engine based on different turbocharging systems[J].Journal of Combustion Science and Technology,2011,17(6):512.
[12]Kawamoto A,Takahashi Y,Koike Takaaki,et al.Variable geometry system turbocharger for passenger car diesel engine[C]∥SAE 2001 World Congress&Exhibition.Detroit:SAE International,2001:2001-01-0273.
[13]Black J,Eastwood P G,Tufail K,et al.The effect of VGT vane control on pumping losses during full-load transient operation of a common-rail diesel engine[C]∥8th International Conference on Engines for Automobiles.Naples:SAE International,2007:2007-24-0063.
[14]胡志远,宋浩,李金,等.基于VNT的高压EGR系统对重型柴油机性能的影响[J].车用发动机,2014(2):68.HU Zhiyuan,SONG Hao,LI Jin,et al.Influence of VNT high pressure EGR system on heavy-duty diesel engine performance[J].Vehicle Engine,2014(2):68.
[15]郑尊清,尧命发,高俊华,等.采用VNT/EGR和DOC降低柴油机排放的试验[J].内燃机学报,2010,28(4):289.ZHENG Zunqing,YAO Mingfa,GAO Junhua,et al.Experimental on reduction of diesel emissions by VNT/EGR and diesel oxidation catalyst[J].Transactions of Chinese Society for Internal Combustion Engines,2010,28(4):289.