二甲醚发动机满足国Ⅵ排放的试验研究  

Dimethyl Ether Engine Meet China Ⅵ Emission Test Research

作　　者：熊江勇 李重重 滕雪梅[1] 吴会波 XIONG Jiang-yong;LI Chong-chong;TENG Xue-mei;WU Hui-bo(College of Automotive Engineering,Nanjing Vocational College of Information and Technology,Jiangsu Nanjing 210013,China)

机构地区：[1]南京信息职业技术学院汽车工程学院,江苏南京210013

出　　处：《机械设计与制造》2022年第5期281-284,291,共5页Machinery Design & Manufacture

基　　金：江苏省高等学校自然科学研究资助项目(17KJD470002);南京信息职业技术学院科技创新团队基金(KJ17006)。

摘　　要：本研究探讨了废气再循环率(EGR)在各种喷射工况下对二甲醚(DME)发动机燃烧所排放出来的物质进行了试验测试。为了检测EGR和注射时间对发动机排放的影响,进行了EGR率在0%、15%、30%三种情况下和喷射时间从上止点前(BTDC)40°至上止点(TDC)喷射DME对发动机燃烧排放的影响。随着喷射注入时间的提前(TDC至25°BTDC),缸内平均有效压力(IMEP)随着EGR率的变化,发动机在燃烧过程中烟尘(FSN)排放量很少,但随着燃烧时间的延长和EGR率的增加,FSN略有增加。虽然随着喷射注入时间25°BTDC至40°BTDC,高的EGR率会产生非常低的NO_(x),但HC和CO的产量却会高于EGR为0°时的排放量。另外,EGR的使用增加了废气中总粒子数和粒子体积的增加,但总粒子数体积会随着喷油正时的提前而降低。In this study,the exhaust gas recycling rate(EGR)was studied to test the main emissions from the combustion of dimethyl ether(DME)engines under various injection conditions. In order to test the effect of EGR and injection time on engine emission,the effect of injection DME with EGR rate of 0%,15%,30% and injection time of 40° from BTDC to TDC on engine combustion emission was carried out. With the advance of injection time(TDC to 25°BTDC),the average effective pressure(IMEP)in the cylinder changes with the EGR rate,and the emission of smoke(FSN)in the combustion process of the engine is very small,but with the extension of combustion time and the increase of EGR rate,FSN slightly increases. Although high EGR rates produce very low NO_(x) with injection time from 25°BTDC to 40°BTDC,HC and CO production is higher than emissions at 0° EGR. In addition,the use of EGR increases the total particle number and particle volume in the exhaust gas,but the total particle number and volume will decrease with the advance of oil injection timing.

关 键 词：EGR率 DME 排放物 喷油正时 BTDC 

分 类 号：TH16[机械工程—机械制造及自动化] TK464[动力工程及工程热物理—动力机械及工程]