VGT与米勒循环对生物柴油排放的优化  

Optimization of VGT/Miller Cycle on Emissions of Biodiesel

作　　者：南婧雯 周斌[1] 郑佳 闫嘉楠[1] NAN Jingwen;ZHOU Bin;ZHENG Jia;YAN Jianan(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031)

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《内燃机》2018年第4期17-22,共6页Internal Combustion Engines

摘　　要：为了降低生物柴油在低速时NOx排放的同时不引起其他性能的恶化,我们以4JB1型柴油机为对象建立一维仿真模#型,将可变截面涡轮增压器和米勒循环相结合,对体积比为30%的地沟油生物柴油0柴油混合燃料在低转速下的排放进行优化并提出控制策略。结果表明:100%负荷下利用遗传算法对NOx、Soot排放和BSFC分别进行单目标优化后分别降低了28.34%、84.89%和1.15%。通过双目标优化的Pareto解集发现,BSFC和NOx比排放更容易同时实现优化。最后经过多目标优化,在100%和50%负荷时,米勒度分别为M98和M85,VGT阀门开度分别为0.25和0.16时目标函数达到最小,NOx分别比优化前降低了23.17%和8.2%,虽然Soot排放有所上升,但与燃用纯柴油的Soot排放相当。In order to reduce biodiesel＇s NOx emission not causing the deterioration of other performance in low speed, 4 JB1 diesel engine was used as research object in this paper, VGT and Miller cycle were combined to discharge the emission of the 0# diesel mixed with the volume ratio of 30% of the gutter oil at low speed. The control strategy is optimized and proposed. the single objective optimization of NOx, Soot emission and BSFC under 100% load is reduced by 28.34%, 84.89% and 1.15% respectively. It is found that BSFC and NOx are easier to achieve simultaneous optimization than emissions by Pareto decomposition of two-objective optimization. At the end of the multi-objective optimization, the Miller degree is M98 and M85 at 100% and 50%, the target function of the VGT valve opening is 0.25 and 0.16 respectively, and the NOx is reduced by 23.17% and 8.2% before the optimization, although the Soot emission increases, but it is equivalent to the Soot discharge from the pure diesel.

关 键 词：生物柴油 可变截面涡轮增压器 米勒循环 排放 优化 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]