压缩比对双燃料燃烧全工况特性影响试验研究  

Experimental Investigation of the Effects of Compression Ratio on the Dual-fuel Combustion Over the Full Operating Map

作　　者：任烁今 郭勇[1] 颜燕[1] 王凤滨[1] 刘麟 REN Shuo-Jin;GUO Yong;YAN Yan;WANG Feng-Bin;LIU Lin(China Automotive Technology and Research Center CO.,Ltd.,Tianjin 300300,China)

机构地区：[1]中国汽车技术研究中心有限公司,天津300300

出　　处：《工程热物理学报》2021年第6期1591-1599,共9页Journal of Engineering Thermophysics

摘　　要：在产品级重型多缸机上对三种不同压缩比条件下的汽柴油双燃料燃烧在全工况平面内进行了优化,重点分析了压缩比对双燃料燃烧全工况范围内燃烧和排放特性的影响,提出了双燃料燃烧在全工况范围内应用的高效清洁燃烧控制策略,并研究了柴油氧化催化器(DOC)对THC和CO排放的净化效果。结果表明:小负荷采用活性控制压燃(RCCI)燃烧模式,中高负荷采用均质混合气引燃(HCII)燃烧模式能够实现汽柴油双燃料全工况范围内的高效清洁燃烧。降低压缩比能够有效拓展中高负荷的最高汽油比例,获得更低的NO_(x)和Soot排放。使用DOC能够有效净化双燃料燃烧各个工况的THC和CO排放。通过使用上述高效清洁燃烧控制策略以及简单后处理装置DOC,汽柴油双燃料燃烧的NO_(x)、Soot、THC和CO四项排放物在欧洲稳态循环(ESC)测试中的综合比排放均能满足国5法规,而且综合比油耗与原机纯柴油模式处于同一水平。Optimizations over the whole operating map were performed for the gasoline-diesel dual-fuel combustion with three different compression ratios.The effects of the compression ratio on the combustion and emission characteristics of the dual-fuel mode were analyzed.The injection and control strategy of the dual-fuel combustion over the whole operating map was proposed.The conversion of the THC and CO emissions by the diesel oxidation catalyst(DOC)was further studied.It was found that in order to achieve high-efficient and clean dual-fuel combustion over the engine map,reactivity controlled compression ignition(RCCI)combustion should be applied at low loads while homogeneous charge induced ignition(HCII)combustion should be utilized at medium to high loads.By lowering the compression ratio,the highest gasoline ratio at high loads was obviously extended;thus,the NO_(x) and Soot emissions were reduced.The THC and CO emissions could be effectively eliminated by DOC.The cycle-averaged NO_(x),Soot,THC and CO emissions of the dual-fuel combustion could meet the China 5 emission regulation simultaneously in the European Stationary Cycle(ESC)test with this injection and control strategy and a simple after-treatment device(DOC).

关 键 词：压缩比 双燃料 后处理 重型多缸机 全工况 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]