Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures
Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures
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DOI：
10.1016/j.combustflame.2010.10.006
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发表时间：
2011-03
影响因子：
4.4
通讯作者：
Xuesong Wu;Zuo-hua Huang;Xiangang Wang;Chun Jin;Chenlong Tang;Lixia Wei;C. Law
中科院分区：
文献类型：
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作者：
Xuesong Wu;Zuo-hua Huang;Xiangang Wang;Chun Jin;Chenlong Tang;Lixia Wei;C. Law
本文对2，5-二甲基呋喃-空气混合物在高压下球形膨胀火焰的层流燃烧速度和火焰不稳定性的发生进行了实验研究。得到了不同当量比和初始压力下的层流燃烧速度、层流燃烧通量和Markstein长度。此外，扩散热和流体动力学对火焰前缘不稳定性的影响进行了详细说明，并报告了细胞性的发生。结果表明，层流燃烧速度随着初始压力的增加而减小，这是由于自由流密度的增加和三体终止反应的逐渐重要。随着初始压力的增加，Markstein长度减小，层流燃烧通量增加。火焰不稳定性的发作，表示在临界半径或Peclet数，被认为是促进与增加当量比和初始压力，由于扩散热和流体动力学不稳定性的综合影响。
An experimental investigation on laminar burning velocities and onset of flame instabilities on spherically expanding flames in 2,5-dimethylfuran–air mixtures at elevated pressures was conducted over a wide range of equivalence ratios. The laminar burning velocities, laminar burning fluxes and Markstein lengths at different equivalence ratios and initial pressures were obtained. Furthermore, the diffusional–thermal and hydrodynamic effects on flame front instabilities were specified, and the onset of cellularity was reported. Results show that laminar burning velocities are decreased with increasing initial pressure due to the increase of the free-stream density and the progressively more important three-body termination reactions. With increasing initial pressure, Markstein length decrease, while the laminar burning flux increases. Onsets of flame instabilities, expressed in terms of critical radius or Peclet number, were found to be promoted with increasing equivalence ratio and initial pressures, due to the combined effects of diffusional–thermal and hydrodynamic instabilities.