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首页> 外文期刊>Fuel >Experimental investigation of combustion and particle emissions under different combustion modes on a heavy-duty diesel engine fueled by diesel/gasoline/diesel from direct coal liquefaction
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Experimental investigation of combustion and particle emissions under different combustion modes on a heavy-duty diesel engine fueled by diesel/gasoline/diesel from direct coal liquefaction

机译：直接液化柴油/汽油/柴油驱动的重型柴油机在不同燃烧方式下燃烧和颗粒物排放的实验研究

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摘要

In an effort to contribute in further reducing pollution and fuel consumption, the effects of various combustion modes on the combustion process and emissions were investigated on a modified single cylinder from a six-cylinder engine using diesel, gasoline, and diesel from direct coal liquefaction (DDCL). The engine was run at 1000 r/min with an indicated mean effective pressure (IMEP) of 0.7 MPa. Additionally, we experimentally evaluated the impact of exhaust gas recirculation (EGR) and did comparisons among the tested fuels. Gasoline was injected into the intake port to form a homogeneous mixture and compression ignition, which led to homogeneous charge compression ignition (HCCI). Diesel was injected near top dead center (TDC), which was dominated by diffused combustion depending on the mixing rate of diesel and air. DDCL was also injected near TDC. In comparison with diesel, DDCL has a longer ignition delay (ID) than diesel due to low cetane number and high volatility. It also had a heat release rate between that of gasoline and diesel. Among the tested fuels, gasoline displayed the highest gross indicated thermal efficiency, followed by DDCL, and then diesel. Moreover, emission test results showed that gasoline had the lowest NOx and soot emissions, but had the highest CO and HC emissions. Different particle modes were present under different EGR conditions. For instance, at an EGR ratio lower than 20%, the particles of the tested fuels were composed mainly of nucleation-mode particles. When the EGR ratio was higher than 20%, the particles of DDCL and diesel were of accumulation-mode, whereas those of gasoline were of small-diameter nucleation-mode.
机译：为了进一步减少污染和燃料消耗，我们对六缸发动机使用柴油，汽油和直接煤液化的柴油制成的改进型单缸发动机，研究了各种燃烧方式对燃烧过程和排放的影响（ DDCL）。发动机以1000 r / min的速度运行，指示平均有效压力（IMEP）为0.7 MPa。此外，我们通过实验评估了废气再循环（EGR）的影响，并在测试的燃料之间进行了比较。将汽油注入进气口以形成均质混合物和压缩点火，从而导致均质充量压缩点火（HCCI）。柴油是在上止点（TDC）附近注入的，该死点主要取决于柴油和空气的混合速率，由扩散燃烧引起。 DDCL也注入了TDC附近。与柴油相比，由于十六烷值低和挥发性高，DDCL的点火延迟（ID）比柴油长。它还具有介于汽油和柴油之间的放热率。在测试的燃料中，汽油显示的总指示热效率最高，其次是DDCL，然后是柴油。此外，排放测试结果表明，汽油的NOx和烟尘排放量最低，而CO和HC排放量最高。在不同的EGR条件下存在不同的粒子模式。例如，在EGR率低于20％时，被测试燃料的颗粒主要由成核模式颗粒组成。当EGR率高于20％时，DDCL和柴油的颗粒处于累积模式，而汽油的颗粒具有小直径成核模式。

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  • 来源
    《Fuel》 |2019年第15期|115661.1-115661.10|共10页
  • 作者

    Wu Binyang; Deng Longfei; Gu Wenyu; Wu Bo; Guo Jianjun;

  • 作者单位

    Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China;

    Tianjin Univ, State Key Lab Engines, Tianjin 300072, 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; Gasoline; Diesel from direct coal liquefaction; Thermal efficiency; Particle number concentration;

    机译：柴油;汽油;柴油从直接煤液化;热效率;粒子数浓度;

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