不同喷油定时和氧含量对正丙醇/柴油RCCI燃烧与排放特性的影响  

Combustion and emission characteristics of n-propanol/diesel RCCI at different start of injection timing and oxygen ratios

作　　者：韩伟强[1] 曾光 张鹏[2] 汪欣 唐国强 范振华 文昌燊 HAN Weiqiang;ZENG Guang;ZHANG Peng;WANG Xin;TANG Guoqiang;FAN Zhenhua;WEN Changshen(Key Laboratory of Automotive Measurement,Control and Safety,Xihua University,Chengdu 610039;Key Laboratory of Shaanxi Province for Development and Application of New Transportation Energy,Chang’an University,Xi’an 710061;Department of Ecology and Environment of Nanchong,Nanchong 637000)

机构地区：[1]西华大学,汽车测控与安全四川省重点实验室,成都610039 [2]长安大学,交通新能源开发、应用与汽车节能陕西省重点实验室,西安710061 [3]四川省南充市生态环境局,南充637000

出　　处：《环境科学学报》2022年第6期337-345,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金青年科学基金(No.52006182);四川省自然科学基金(No.2022NSFSC0196);广元市科技计划重点研发项目(No.21ZDYF0025);西华大学2019年“青年学者”支持计划项目;交通新能源开发、应用与汽车节能陕西省重点实验室(长安大学)开放基金资助项目(No.300102229510)。

摘　　要：在总循环能量和发动机转速不变的条件下,运用一台六缸重型增压柴油机研究了不同喷油定时和氧含量对正丙醇/柴油活性控制压燃(Reactivity controlled compression ignition,RCCI)的燃烧与排放特性的影响.结果表明,随着喷油定时(Start of injection,SOI)的提前,第一燃烧阶段的放热率峰值和缸内温度不断增加,初始着火相位(CA10)和燃烧重心(CA50)同步提前,燃烧持续期基本不变,滞燃期增加.CO和HC的排放随SOI提前逐渐减小,而NO_(x)的排放随SOI提前逐渐增加;颗粒物排放的平均粒径(Particle average diameter,PAD)和颗粒物质量浓度(Particle mass concentration,PMC)及颗粒物数量浓度(Particle number concentration,PNC)会随SOI的提前呈现出逐渐降低的趋势.而氧含量(Oxygen ratios,RO)的增加会使缸内压力和缸内温度整体略微下降,滞燃期整体小幅度增加.CO和HC的排放会随着RO的增加而增加,但RO基本不影响NO_(x)的排放.另外,RO的增加会使得PAD增加,PNC降低,对PMC的影响规律不明显.The effects of different start of injection timings(SOI)and oxygen ratio(RO)on the combustion and emission characteristics of n-propanol/diesel RCCI were studied in a six-cylinder heavy-duty turbocharged diesel engine under constant total cycle energy and engine speed.The results showed that with the advance of SOI,the peak heat release rate and the in-cylinder temperature in the first combustion stage increased continuously,the initial ignition phase(CA10)and the center of combustion(CA50)advanced synchronously,the combustion duration is basically unchanged,and the ignition delay period increased.As for the emissions,CO and HC decreased gradually with the advance of SOI,while the NO_(x) emission increased gradually.The particle average diameter(PAD)and particle number concentration(PNC)and particle mass concentration(PMC)emissions decreased in different degrees.With regard to the influence of RO,the pressure and temperature in the cylinder decreased slightly and the ignition delay period increased with the RO increase.As for the emissions,CO,HC and PAD increased,PNC decreased,while NO_(x) stayed almost unchanged with the RO increase,and PMC is not related to RO.

关 键 词：柴油 喷油定时 氧含量 活性控制压燃 燃烧与排放 正丙醇 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]