Laminar burning velocities and Markstein lengths of premixed methane/air flames near the lean flammability limit in microgravity
Laminar burning velocities and Markstein lengths of premixed methane/air flames near the lean flammability limit in microgravity
复制标题
微重力下贫燃极限附近预混合甲烷/空气火焰的层流燃烧速度和马克斯坦长度
DOI：
10.1016/j.combustflame.2010.01.006
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发表时间：
2010-04
影响因子：
4.4
通讯作者：
Gorczakowski, Andrzej
中科院分区：
文献类型：
--
作者：
Zhang, Hai;Podfilipski, Jerzy;Jarosinski, Jozef;Wang, Shuang-Feng;Gorczakowski, Andrzej
火焰拉伸对近极限贫燃料甲烷/空气火焰层流燃烧速度的影响已经使用微重力环境进行了实验研究，以尽量减少浮力的复杂性。采用向外传播的球形火焰来评估层流燃烧速度对火焰拉伸（以马克斯坦长度表示）的敏感性，以及未拉伸火焰的基本层流燃烧速度。报告了环境温度和压力下甲烷/空气混合物的结果数据，当量比的特定范围从 0.512（燃烧室中发现的微重力可燃性极限）延伸到 0.601。目前对未拉伸层流燃烧速度的测量与所有测量的当量比下独特的现有微重力数据集非常一致。然而，之前使用各种实验技术进行的大多数 1-g 实验似乎给出的燃烧速度明显高于微重力结果。此外，主要在超限条件下调整的三种化学反应机制预测的燃烧速度也远高于目前的实验数据。本研究的其他结果还包括总活化能和相应的泽尔多维奇数，以及全局火焰路易斯数随当量比的变化。讨论了这些结果的含义。
Effects of flame stretch on the laminar burning velocities of near-limit fuel-lean methane/air flames have been studied experimentally using a microgravity environment to minimize the complications of buoyancy. Outwardly propagating spherical flames were employed to assess the sensitivities of the laminar burning velocity to flame stretch, represented by Markstein lengths, and the fundamental laminar burning velocities of unstretched flames. Resulting data were reported for methane/air mixtures at ambient temperature and pressure, over the specific range of equivalence ratio that extended from 0.512 (the microgravity flammability limit found in the combustion chamber) to 0.601. Present measurements of unstretched laminar burning velocities were in good agreement with the unique existing microgravity data set at all measured equivalence ratios. Most of previous 1-g experiments using a variety of experimental techniques, however, appeared to give significantly higher burning velocities than the microgravity results. Furthermore, the burning velocities predicted by three chemical reaction mechanisms, which have been tuned primarily under off-limit conditions, were also considerably higher than the present experimental data. Additional results of the present investigation were derived for the overall activation energy and corresponding Zeldovich numbers, and the variation of the global flame Lewis numbers with equivalence ratio. The implications of these results were discussed.
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DOI：
10.1016/s0082-0784(89)80168-7
发表时间：
1989
期刊：
--
影响因子：
--
作者：
K. Lakshmisha;P. Paul;N. Rajan;G. Goyal;H. Mukunda
通讯作者：
K. Lakshmisha;P. Paul;N. Rajan;G. Goyal;H. Mukunda
影响因子：
4.4
作者：
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通讯作者：
C. Sun;C. Sung;L. He;C. Law
DOI：
10.1016/s0082-0784(06)80020-2
发表时间：
1992
期刊：
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影响因子：
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作者：
J. Göttgens;F. Mauss;N. Peters
通讯作者：
J. Göttgens;F. Mauss;N. Peters
影响因子：
1.9
作者：
J. Jarosiński;J. Podfilipski;A. Gorczakowski;B. Veyssière
通讯作者：
J. Jarosiński;J. Podfilipski;A. Gorczakowski;B. Veyssière
DOI：
10.1016/s0082-0784(88)80426-0
发表时间：
1988
期刊：
--
影响因子：
--
作者：
R. Strehlow;K. A. Noe;B. Wherley
通讯作者：
R. Strehlow;K. A. Noe;B. Wherley