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A high pressure ignition delay time study of 2-methylfuran and tetrahydrofuran in shock tubes

机译：冲击管中2-甲基呋喃和四氢呋喃的高压点火延迟时间研究

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摘要

Ignition delay time studies for tetrahydrofuran (THF) and 2-methylfuran (2MF) as well as optical investigations of combustion for 2MF have been carried out using two shock tubes. The experiments with undiluted THF/air mixtures were performed at 20 and 40 bar in a high pressure shock tube (HPST) at an equivalence ratio of Φ= 1 covering an overall temperature range of 780-1100K and 691-1006K, respectively. Undiluted 2MF/air mixtures (Φ= 1) were also investigated in the HPST at 40 bar in the temperature range of 820-1215 K. The experimental data of 2MF obtained at 40 bar were supported with kinetic simulations of existing models from literature. Additionally, sensitivity analyses of 2MF at several temperatures were performed for finding out the most sensitive reactions. Schlieren imaging was employed in a rectangular shock tube (RST) utilizing a high speed video camera through which the ignition process was captured for a stoichiometric 2MF/O_2/Ar mixture at pressures of about 10 bar and in the temperature range of 871-1098 K. The pressure signals of THF and 2MF at 40 bar indicate two types of pre-ignition at low temperatures: a short two-stage ignition for THF and a relatively long and smooth increase in pressure before main ignition for 2MF. Furthermore, in case of 2MF at 40 bar, far-wall ignitions at low temperatures could be observed. The deviation between simulation and experiment as well as the presence of pre-ignitions in the low temperature regime were the main reasons for undertaking optical investigations of 2MF. The Schlieren images show that the ignition process at low temperatures (T ≤940 K) begins as a deflagrative phase in the form of flame kernels and ends in a strong ignition (explosion in explosion). The current study analyzes the auto-ignition of THF and 2MF at engine relevant pressures and temperatures. The optical investigations have been conducted to analyze the ignition behavior of 2MF.
机译：使用两个激波管进行了四氢呋喃（THF）和2-甲基呋喃（2MF）的点火延迟时间研究以及2MF燃烧的光学研究。使用未稀释的THF /空气混合物的实验在高压冲击管（HPST）中分别在20 bar和40 bar下进行，当量比Φ= 1时，分别覆盖了780-1100K和691-1006K的整个温度范围。还在820-1215 K的温度范围内于40 bar的HPST中研究了未稀释的2MF /空气混合物（Φ= 1）。文献中现有模型的动力学模拟支持了40MF下2MF的实验数据。另外，在几个温度下进行了2MF的敏感性分析，以找出最敏感的反应。将Schlieren成像用于使用高速摄像机的矩形减震管（RST）中，通过该摄像头在大约10 bar的压力和871-1098 K的温度范围内捕获化学计量的2MF / O_2 / Ar混合物的点火过程。40 bar下THF和2MF的压力信号表明在低温下有两种预点火类型：THF的短两阶段点火和2MF主点火之前的压力相对较长且平稳的升高。此外，在2MF在40 bar的情况下，可以观察到低温下的远壁着火。模拟和实验之间的偏差以及低温状态下的预点火的存在是进行2MF光学研究的主要原因。 Schlieren图像显示，低温下（T≤940K）的点火过程以火焰核形式的爆燃阶段开始，并以强力点火（爆炸爆炸）结束。当前的研究分析了在发动机相关压力和温度下THF和2MF的自燃。已经进行了光学研究以分析2MF的点火行为。

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  • 来源
    《Combustion and Flame》 |2014年第10期|2519-2530|共12页
  • 作者

    Yasar Uygun; Sakiko Ishihara; Herbert Olivier;

  • 作者单位

    Shock Wave Laboratory, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

    Shock Wave Laboratory, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

    Shock Wave Laboratory, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

  • 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

    2-Methylfuran; Tetrahydrofuran; Biofuel; Shock tube; Ignition delay; Optical investigation;

    机译：2-甲基呋喃;四氢呋喃;生物燃料避震管;点火延迟;光学调查;

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