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Turbulent flame propagation enhancement by application of dielectric barrier discharge to fuel-air mixtures

机译:通过对燃料-空气混合物施加电介质阻挡层放电来增强湍流火焰传播

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摘要

The promotional effect of non-thermal plasma (NTP) on lean flame propagation in turbulent fuel-air mixtures in a reciprocating engine-like high-temperature and-pressure environment was investigated. A turbulent flow was created by installing a perforated plate with oblique holes in the combustion chamber of a rapid compression and expansion machine (RCEM). Ignition was conducted by conventional spark plug. The NTP was generated by a dielectric-barrier discharge (DBD) device installed in the combustion chamber near the spark plug. A portion of the lean fuel-air mixture (phi=0.5) in the chamber passed through the NTP and diffused throughout the chamber before spark ignition. To elucidate whether the effect persisted even when the plasma-affected volume was diffused by the flow, two types of experiments with temporal delay were conducted. The fuels evaluated were n-heptane as a representative fuel with a strong low-temperature oxidation reaction, i-octane as a representative fuel with a weak low-temperature reaction, and a primary reference fuel consisting of a mixture of these two fuels. Temporal growth of the flame was observed using a high-speed camera with an image intensifier. The evolution of in-cylinder pressure was also monitored and the characteristic time of the mass fraction burned was evaluated accordingly. It was found that flame propagation was promoted by DBD for n-heptane-containing mixtures at a certain initial temperature while the i-octane-air mixture did not exhibit such enhancement. The results obtained suggest that long-lived intermediate chemical species formed by the plasma diffuse into the cylinder, affecting flame propagation through promotion of a low-temperature oxidation reaction. In addition to these findings, the effect of NTP on burning periods were evaluated. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译:研究了非热等离子体(NTP)对湍流燃料-空气混合物中稀薄火焰在类似发动机往复运动的高温高压环境中的扩散的促进作用。通过在快速压缩和膨胀机(RCEM)的燃烧室内安装带有斜孔的多孔板来产生湍流。用传统的火花塞进行点火。 NTP是由安装在燃烧室中靠近火花塞的电介质阻挡放电(DBD)设备生成的。在火花点火之前,燃烧室中的一部分稀薄的燃油空气混合物(phi = 0.5)通过NTP并扩散到整个燃烧室中。为了阐明即使受血浆影响的体积通过流动扩散后效果是否仍然存在,进行了两种具有时间延迟的实验。评估的燃料为正庚烷作为具有强烈的低温氧化反应的代表性燃料,异辛烷作为具有较弱的低温反应的代表性燃料以及由这两种燃料的混合物组成的主要参考燃料。使用带有图像增强器的高速相机观察火焰的时间增长。还监测了缸内压力的变化,并据此评估了燃烧质量分数的特征时间。发现在特定的初始温度下,DBD促进了含正庚烷的混合物的火焰传播,而异辛烷-空气混合物则没有这种增强。获得的结果表明,由等离子体形成的长寿命中间化学物质扩散到圆柱中,通过促进低温氧化反应影响火焰传播。除了这些发现之外,还评估了NTP对燃烧时间的影响。 (C)2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2018年第6期|401-409|共9页
  • 作者单位

    Natl Inst Adv Ind Sci & Technol, 1-2-1 Namiki, Tsukuba, Ibaraki 3058564, Japan;

    Natl Inst Adv Ind Sci & Technol, 1-2-1 Namiki, Tsukuba, Ibaraki 3058564, Japan;

    Univ Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan;

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

    Non-thermal plasma; Lean burn, DBD; Flame propagation; ICE;

    机译:非热等离子体;稀燃;DBD;火焰传播;ICE;

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