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Combustion and emissions of isomeric butanol/gasoline surrogates blends on an optical GDI engine

机译：光学GDI引擎上异构丁醇/汽油替代物混合物的燃烧和排放

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摘要

The combination of distinctive physicochemical properties of biofuels and recent engine technologies offer benefits in terms of efficiency improvement and emissions reduction. The recent development in butanol bio-based production pathways encourage researchers to study their combustion characteristics. This paper experimentally evaluates the combustion and emissions of a gasoline direct injection (GDI) engine fueled with the butanol isomer/gasoline surrogate blends, in which primary reference fuel (PRF) and toluene primary reference fuel (TPRF) are selected as the gasoline surrogates, respectively. The flame propagation behaviors, in-cylinder pressure, apparent heat release rate, along with PN emissions from this optical GDI engine are discussed. First, butanol addition to the gasoline surrogates is found to slow down flame propagation, reduce peak cylinder pressure and heat release rate, and extend ignition delay and combustion duration. Further, among the four butanol isomers, n-butanol and tert-butanol are the most and least reactive fuels, respectively, whereas iso-butanol and sec-butanol show reactivities in between, as supported by the measured flame propagation and pressure traces, calculated heat release rates, as well as time scales describing the combustion progress, e.g. ignition delay and combustion duration. Finally, butanol addition reduces the PN emissions from the GDI engine, and the PN emissions reduction capacity of the four butanol isomers ranks as sec-butanol > iso-butanol > n-butanol > tert-butanol. Also, compared to the PRF/butanol blends, the PN emissions are reduced to a less extent when butanol is blended with TPRF.
机译：生物燃料独特的理化特性与最新的发动机技术相结合，在提高效率和减少排放方面带来了好处。丁醇生物基生产途径的最新发展鼓励研究人员研究其燃烧特性。本文通过实验评估了以丁醇异构体/汽油替代混合物为燃料的汽油直喷（GDI）发动机的燃烧和排放，其中选择了主要参考燃料（PRF）和甲苯主要参考燃料（TPRF）作为汽油替代物，分别。讨论了该光学GDI发动机的火焰传播行为，缸内压力，表观放热率以及PN排放。首先，发现在汽油代用品中添加丁醇可减慢火焰传播，降低峰值气缸压力和放热速率，并延长点火延迟和燃烧持续时间。此外，在四种丁醇异构体中，正丁醇和叔丁醇分别是反应性最高和最不活泼的燃料，而异丁醇和仲丁醇的反应性介于两者之间，这受测得的火焰传播和压力曲线计算得出放热率，以及描述燃烧过程的时间尺度，例如点火延迟和燃烧持续时间。最后，丁醇的添加减少了来自GDI发动机的PN排放，并且四种丁醇异构体的PN减少排放能力为仲丁醇>异丁醇>正丁醇>叔丁醇。而且，与PRF /丁醇共混物相比，当丁醇与TPRF共混时，PN排放降低的程度较小。

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  • 来源
    《Fuel》 |2020年第jul15期|117690.1-117690.9|共9页
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  • 作者单位

    Shanghai Jiao Tong Univ Sch Mech Engn Dongchuan Rd 800 Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ Key Lab Power Machinery & Engn Minist Educ Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mech Engn Dongchuan Rd 800 Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mech Engn Dongchuan Rd 800 Shanghai 200240 Peoples R China|Banha Univ Benha Fac Engn Mech Engn Dept Banha 13512 Egypt;

  • 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

    Butanol; Gasoline surrogate; Particulate emissions; Combustion; GDI optical engine; Apparent flame speed;

    机译：丁醇汽油替代品;颗粒物排放;燃烧;GDI光学引擎;视在火焰速度;

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