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首页> 外文期刊>Combustion and Flame >A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer
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A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer

机译：在逆流混合层中通过添加二甲醚增强甲醇自燃的计算分析

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摘要

To provide fundamental insights into the ignition enhancement of methanol (MeOH) by the addition of the more reactive dimethyl ether (DME), computational parametric studies were conducted in a one-dimensional counterflow fuel versus air mixing layer configuration with the incorporation of detailed chemistry and transport. Various computational analysis tools based on the computational singular perturbation (CSP) framework were employed for detailed identifications of complex chemical pathways. CSP tools were also used to develop a 43-species skeletal mechanism for efficient computation of ignition of methanol-DME blends at engine conditions. The overarching practical question was the extent to which the addition of DME improves the ignitability of the methanol. As a baseline analysis, the results of a uniform temperature condition at 850 K showed that the low temperature chemistry associated with the DME fuel was highly effective in promoting autoignition. The increase in the oxidizer side temperature was found to diminish the ignition enhancement by DME blending, as the overall reactivity increases and the dominant chemical pathways become shifted towards the high temperature reactions. Finally, the strain rate effect on the ignition delay time was found to be significant for the pure methanol case, and then the effect diminishes as the amount of DME addition increases. This behavior was explained by examining the spatial locations of the ignition kernels and the Damköhler number history for different strain rate conditions.
机译：为了通过添加更具反应性的二甲醚（DME）提供甲醇（MeOH）点火增强的基本见识，在一维逆流燃料与空气混合层结构中进行了计算参数研究，并结合了详细的化学方法和运输。基于计算奇异摄动（CSP）框架的各种计算分析工具用于复杂化学路径的详细识别。 CSP工具还用于开发43种骨骼机制，以有效计算发动机条件下甲醇-DME混合物的点火。实际的首要问题是添加二甲醚在多大程度上改善了甲醇的可燃性。作为基线分析，在850 K的均匀温度条件下的结果表明，与DME燃料相关的低温化学物质在促进自燃方面非常有效。发现氧化剂侧温度的升高通过DME共混降低了点火增强，这是因为总反应性增加并且主要的化学途径转向高温反应。最后，发现在纯甲醇的情况下，应变速率对点火延迟时间的影响是显着的，然后随着DME添加量的增加，该影响逐渐减小。通过检查点火应变的空间位置和不同应变率条件下的Damköhler数历史来解释这种行为。

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  • 来源
    《Combustion and Flame》 |2018年第9期|84-98|共15页
  • 作者

    Wonsik Song; Efstathios-Al. Tingas; Hong G. Im;

  • 作者单位

    Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST);

    Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST);

    Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST);

  • 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

    CSP; Explosive dynamics; Dimethyl ether; Methanol; Counterflow; Autoignition;

    机译：CSP;爆炸动力学;二甲醚;甲醇;逆流;自燃;

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