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Experimental investigation of pilot-fuel combustion in dual-fuel engines, Part 1: Thermodynamic analysis of combustion phenomena

机译：双燃料发动机引燃燃烧的实验研究，第1部分：燃烧现象的热力学分析

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摘要

The pilot-fuel auto-ignition and combustion in compressed methane/air mixtures are investigated. Experiments were performed in an optically accessible rapid compression-expansion machine featuring quiescent charge conditions and a single-hole coaxial diesel injector mounted on the cylinder periphery. It enabled thermodynamic analysis of the pilot-fuel combustion without these phenomena being masked by the rapid premixed-flame propagation like in the engine test rigs with turbulent charge. The aim of this study is to elucidate the first-order influences of charge and pilot-fuel parameters on the ignition delay and transition into the premixed flame propagation. For this purpose, a comprehensive measurement matrix including variations of the premixed fuel equivalence ratio, charge temperature, and oxygen content as well as the variation of pilot injection duration is tested. The heat release rate (HRR) metrics describing the pilot-fuel combustion duration, peak HRR, and cumulative HRR during the pilot-fuel combustion are derived. Correlations of the HRR metrics to the ignition delay, pilot-fuel mixing state at ignition and the volume of the pilot-fuel jet are investigated. Methane is found to increase the ignition delay and prolong the pilot-fuel combustion duration. This effect is amplified for pilot-injection strategies with leaner pilot-fuel mixtures at ignition or in the case of reduced charge oxygen content. Despite the reduced pilot-fuel reactivity the co-combustion of entrained methane leads to higher peak-HRR, except in the reduced charge oxygen cases, where the excessively reduced mixture reactivity with the introduction of methane leads even to a reduced peak-HRR.The phenomenology of the dual-fuel combustion process is described in Part 1, whereas Part 2 of this work aims at improving the understanding of the underlying processes by application of advanced optical diagnostic methods.
机译：研究了压缩甲烷/空气混合物中的引燃燃料自动点火和燃烧。实验是在具有静态充气条件的光学可访问快速压缩膨胀机和安装在气缸外围的单孔同轴柴油喷射器上进行的。它能够对引燃燃料燃烧进行热力学分析，而不会像在带有湍流充量的发动机试验台中那样迅速地预混合火焰传播掩盖这些现象。这项研究的目的是阐明充气和引燃燃料参数对点火延迟和过渡到预混火焰传播的一阶影响。为此，测试了包括预混燃料当量比，充气温度和氧气含量的变化以及引燃喷射持续时间的变化在内的综合测量矩阵。得出描述引燃燃料燃烧持续时间，峰值HRR和引燃燃料燃烧期间的累积HRR的放热率（HRR）度量。研究了HRR指标与点火延迟，点火时引燃燃料混合状态以及引燃燃料射流的体积之间的关系。发现甲烷会增加点火延迟并延长引燃燃料的燃烧持续时间。对于在点火时或在充电氧含量降低的情况下使用稀薄的引燃燃料混合物的引燃喷射策略，此效果会放大。尽管降低了引燃燃料的反应性，但夹带甲烷的共燃烧会导致较高的峰HRR，但在减少充氧的情况下，由于引入甲烷而导致混合物的反应性过度降低甚至导致峰HRR降低。第1部分描述了双燃料燃烧过程的现象学，而本工作的第2部分旨在通过应用先进的光学诊断方法来提高对基本过程的理解。

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  • 来源
    《Fuel》 |2019年第1期|115642.1-115642.16|共16页
  • 作者

    Srna Ales; von Rotz Beat; Herrmann Kai; Boulouchos Konstantinos; Bruneaux Gilles;

  • 作者单位

    Paul Scherrer Inst, Energy & Environm Div, Forsch Str 111, CH-5232 Villigen, Switzerland;

    Paul Scherrer Inst, Energy & Environm Div, Forsch Str 111, CH-5232 Villigen, Switzerland;

    Univ Appl Sci & Arts Northwestern Switzerland, Inst Thermal & Fluid Engn, Sch Engn, Klosterzelgstr 2, CH-5210 Windisch, Switzerland;

    Swiss Fed Inst Technol, Inst Energy Technol, Lab Aerothermochem & Combust Syst, Sonneggstr 3, CH-8092 Zurich, Switzerland;

    IFP Energies Nouvelles, Inst Carnot IFPEN Transports Energie, 1 & 4 Ave Bois Preau, F-92852 Rueil Malmaison, France;

  • 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

    Dual-fuel engines; Natural-gas engines; Combustion mode transition; Autoignition; Tracer-PLIF; Combustion phenomenology;

    机译：双燃料发动机;天然气发动机;燃烧模式过渡;自燃;Tracer-PLIF;燃烧现象学;

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