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Impact of post-injection strategies on combustion and unregulated emissions during different loads in an HSDI diesel engine

机译：注射后策略对HSDI柴油发动机不同负荷燃烧和未调节排放的影响

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摘要

This research was done to study combustion and emissions characteristics especially unregulated emissions from a heavy-duty diesel engine based on three engine loads (20%, 40%, 60%) with different post-injection (PI) strategies, at six start of injection timings (SOI) with a 20 degrees crank angle (CA) interval (20-120 degrees CA) and three post-injection fuel masses (PIM) (5 mg, 10 mg and 15 mg) at constant speed of 1200 revolution per minute (rpm). Common regulated (NOx, soot, and THC) and un-regulated emissions including carbonyl compounds (acetaldehyde, formaldehyde), saturated (methane, ethane, propane) and unsaturated (ethylene, propylene, 1,3 butadiene) emissions were recorded with Fourier Transform Infrared analyzer (FTIR). An early post-injection can increase the engine power output and raise the temperature of the exhaust gases at all engine loads. Reduction in NOx up to 25% and THC up to 60% were recorded at 60 degrees CA while up to 80% reduction in soot emissions was recorded at SOI 80-120 degrees CA with PI strategies at medium to high loads. For all the P.I strategies results indicated that unregulated emissions increased with the increase in the PIM and mostly the peak values of unregulated emissions recorded at SOI 60-80 degrees CA with 15 mg PIM. Post-injection at 60-80 degrees CA found most suitable to produce light hydrocarbon (HC) at lower engine load. In general, the post-injection reduced regulated/unregulated emissions and generate light HC relative to the single main injection which is beneficial for after-treatment devices.
机译：这项研究是为了研究燃烧和排放特性，特别是基于三次发动机载荷（20％，40％，60％）的重型柴油发动机，在六次注射开始时定时（SOI）具有20度曲柄角（CA）间隔（20-120摄氏度）和三个后喷射燃料质量（PIM）（PIM）（5mg，10mg和15mg），恒定速度为每分钟1200°（ rpm）。用傅里叶变换记录了包括羰基化合物（乙醛，甲醛），饱和（甲烷，甲烷，丙烷）和不饱和（乙烯，丙烯，1,3丁二烯）排放的羰基化合物（甲丙基，甲烷，丙烷，丙烷）排放的常规排放量红外分析仪（FTIR）。早期后喷射可以增加发动机功率输出并在所有发动机负载下提高废气的温度。在60摄氏度下记录高达25％的NOx和最高60％的THC在SOI 80-120摄氏度下记录烟灰排放量高达80％，以媒体为高负荷。对于所有P.I策略，结果表明，由于PIM的增加，未调节的排放量增加，主要是在SOI 60-80摄氏度下记录的未调节排放的峰值值为15毫克PIM。在60-80摄氏度下注射发现，最适合在较低发动机负荷下产生轻烃（HC）。通常，后喷射减少调节/未测量的排放，并相对于单个主喷射产生轻质HC，这对于后处理装置是有益的。

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  • 来源
    《Fuel》 |2020年第may1期|117256.1-117256.12|共12页
  • 作者

    Farhan Sheikh Muhammad; Wang Pan; Wu Yan; Yi Jing; Lei Lili;

  • 作者单位

    Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang Jiangsu Peoples R China;

    Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang Jiangsu Peoples R China;

    Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang Jiangsu Peoples R China;

    Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang Jiangsu Peoples R China;

    Jiangsu Univ Sch Automot & Traff Engn 301 Xuefu Rd Zhenjiang Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Diesel engine; Post-injection; Unregulated emissions; Light hydrocarbon;

    机译：柴油机;注射后;未调节的排放;轻质碳氢化合物;

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