重型柴油机冷EGR与VGT耦合优化试验研究
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摘要
以1台重型柴油机为试验对象,基于台架试验结果,通过建立数学模型和评价标准,对各个工况下的EGR和VGT阀门开度组合进行优化。经各评价标准优化结果的比较,选取折中NO_x排放和烟度的标准作为最优方案,对其优化结果进行分析可知:相同转速下,随着负荷的增大,EGR阀门开度先增大后减小;中等负荷下,VGT阀门开度较小,随着转速的升高,阀门开度逐渐增大;NO_x及CO排放整体较低,大负荷和高转速工况下NO_x排放显著提升,低速大负荷工况下CO排放严重升高;中等负荷下,排气烟度极低,但低速大负荷工况下烟度迅速升高。
Based on the bench test results of a heavy-duty diesel engine, the valve opening of EGR and VGT were optimized by establishing the mathematical model and evaluation criteria. By comparing the optimization results of each evaluation criterion, the criterion for a balance between the NO_x and smoke emissions was selected as the optimal scheme. According to theoptimization results of optimal scheme,the valve opening of EGR increased first and then decreased with the increase of load at the same speed. Under medium load, the valve opening of VGT was small and increased gradually with the increase of rotational speed. The total emissions of NO_x and CO were low, the NO_x emission increased significantly under highload and high speed condition and the CO emission increased greatly under low speed and high load condition. The smoke emission was very low under medium load, but increased rapidly under low speed and high load condition.
Based on the bench test results of a heavy-duty diesel engine, the valve opening of EGR and VGT were optimized by establishing the mathematical model and evaluation criteria. By comparing the optimization results of each evaluation criterion, the criterion for a balance between the NO_x and smoke emissions was selected as the optimal scheme. According to theoptimization results of optimal scheme,the valve opening of EGR increased first and then decreased with the increase of load at the same speed. Under medium load, the valve opening of VGT was small and increased gradually with the increase of rotational speed. The total emissions of NO_x and CO were low, the NO_x emission increased significantly under highload and high speed condition and the CO emission increased greatly under low speed and high load condition. The smoke emission was very low under medium load, but increased rapidly under low speed and high load condition.
引文
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[9] 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):68-74.
[10] 邹泽宇,郑尊清,刘佳林,等.不同增压系统对重型柴油机性能和排放影响的试验研究[J].内燃机工程,2017,38(6):1-8.
[11] 楼狄明,郭石磊,谭丕强,等.可变截面涡轮增压器与废气再循环对柴油机排放的影响[J].同济大学学报(自然科学版),2016,44(12):1931-1937.
[12] Zamboni G,Capobianco M.Influence of high and low pressure EGR and VGT control on in-cylinder pressure diagrams and rate of heat release in an automotive turbocharged diesel engine[J].Applied Thermal Engineering,2013,51(1/2):586-596.
[2] Brijesh P,Chowdhury A,Sreedhara S.Effect of Ultra-Cooled EGR and Retarded Injection Timing on Low Temperature Combustion in CI Engines[C].SAE Paper 2013-01-0321.
[3] 楼狄明,樊晓旭,张涛,等.柴油机燃用丁醇柴油燃料的非常规排放特性[J].同济大学学报(自然科学版),2013,42(5):0757-0761.
[4] Jain A,Singh A P,Agarwal A K.Effect of Split Fuel Injection and EGR on NOx and PM Emission Reduction in a Low Temperature Combustion (LTC) Mode Diesel Engine[J].Energy,2017,122:249-264.
[5] Thangaraja J,Kannan C.Effect of exhaust gas recirculation on advanced diesel combustion and alternate fuels-A review[J].Applied Energy,2016,180:169-184.
[6] 赵玉伟,汪映,雷雄,等.预混均质充量压缩燃烧发动机燃烧与排放特性[J].西安交通大学学报,2014,48(7):23-28.
[7] Asad U,Tjong J.Transient Build-up and Effectiveness of Diesel Exhaust Gas Recirculation[J].Diesel Exhaust Emissions Control,2014,7(1):172-182.
[8] 李科,孟令军,赵文辅,等.VGT对高压共轨EGR柴油机性能影响的试验研究[J].内燃机与动力装置,2017,34(5):9-12.
[9] 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):68-74.
[10] 邹泽宇,郑尊清,刘佳林,等.不同增压系统对重型柴油机性能和排放影响的试验研究[J].内燃机工程,2017,38(6):1-8.
[11] 楼狄明,郭石磊,谭丕强,等.可变截面涡轮增压器与废气再循环对柴油机排放的影响[J].同济大学学报(自然科学版),2016,44(12):1931-1937.
[12] Zamboni G,Capobianco M.Influence of high and low pressure EGR and VGT control on in-cylinder pressure diagrams and rate of heat release in an automotive turbocharged diesel engine[J].Applied Thermal Engineering,2013,51(1/2):586-596.