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Fuel property impact on a premixed diesel combustion mode.

机译：燃料特性对预混合柴油燃烧模式有影响。

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摘要

New premixed diesel combustion strategies, with their low engine-out PM and NOx emissions, are highly attractive for production implementation given increasingly strict emissions regulations. Accordingly, premixed diesel combustion strategies must operate effectively on commercially available diesel fuel, whose critical properties vary substantially. It is therefore critical to understand how premixed diesel combustion strategies respond to variations in fuel properties, especially cetane number the primary quantification of ignition behavior.;This research study sought to understand the connection between diesel fuel properties, in particular cetane number, and the combustion and emissions behavior of premixed diesel combustion. Four primary test fuels with cetane numbers varying over the range expected in the field (42--53) were used, along with a secondary matrix of fuels to characterize the behavior of a nitrate cetane improver. Fuel effects were quantified across a range of EGR levels, injection pressures, and engine loads to identify secondary parameter interactions.;Gaseous emissions, particularly NOx emissions, were found to be dependent solely on combustion phasing and EGR rate for the primary test fuels at the studied condition. Fuel cetane number shifts the combustion phasing (increasing cetane number advances phasing) but is only one of many different parameters which shift combustion. The effect of varying cetane number can be counteracted by varying injection timing to yield matched combustion phasing.;The presence of 2-ethylhexyl nitrate (2-EHN) cetane improver within the fuel introduces a new fuel-borne NOx formation mechanism to the combustion process, which significantly increases NO x emissions in a premixed diesel combustion mode. The increase in NOx emissions stems from NOx formed by the decomposition of the 2-EHN additive.;The trends and magnitudes of soot, CO, and HC emissions remain constant for all tested fuels across a range of engine loads. The high load limit of the tested premixed diesel combustion mode is primarily limited by equivalence ratio, with excessive soot, CO, and HC emissions resulting as the overall equivalence ratio approaches stoichiometric. The light load limit is limited by high CO and HC emissions and the ability of a diesel oxidation catalyst to reduce these emissions to acceptable levels.
机译：鉴于日益严格的排放法规，具有低发动机输出PM和NOx排放量的新型预混合柴油燃烧策略对生产实施极具吸引力。因此，预混合柴油燃烧策略必须对关键特性有很大差异的市售柴油有效地运行。因此，至关重要的是要了解预混合柴油的燃烧策略如何对燃料特性（尤其是十六烷值）的变化做出反应，这是点燃行为的主要量化指标。和预混合柴油燃烧的排放行为。使用了四种十六烷值在现场预期范围内变化的主要试验燃料（42--53），以及次级燃料矩阵来表征硝酸十六烷值改进剂的性能。在一系列EGR水平，喷射压力和发动机负载范围内对燃油效果进行了量化，以识别次要参数相互作用;气态排放物（尤其是NOx排放物）仅取决于燃烧阶段和主测试燃料在EGR率。研究状况。燃料十六烷值改变了燃烧定相（十六烷值增加了使定相），但是仅仅是改变燃烧的许多不同参数之一。十六烷值变化的影响可以通过改变喷射正时来抵消，以产生匹配的燃烧阶段。燃料中存在硝酸2-乙基己酯（2-EHN）十六烷值改进剂为燃烧过程引入了一种新的燃料生成NOx的机制，这大大增加了预混合柴油燃烧模式下的NOx排放量。 NOx排放量的增加源于2-EHN添加剂分解形成的NOx。在所有发动机负载范围内，所有测试燃料的烟尘，CO和HC排放量的趋势和大小保持恒定。被测试的预混合柴油燃烧模式的高负荷极限主要受到当量比的限制，随着总当量比接近化学计量，会产生过量的烟尘，CO和HC排放。轻载限制受到高的CO和HC排放以及柴油氧化催化剂将这些排放降低到可接受水平的能力的限制。

著录项

  • 作者

    Ickes, Andrew M.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 148 p.
  • 总页数 148
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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