On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure
On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure
复制标题
关于从向外传播的球形火焰测量的层流火焰速度的准确性：常温常压下的甲烷/空气
DOI：
10.1016/j.combustflame.2015.02.012
复制
发表时间：
2015-06
影响因子：
4.4
通讯作者：
Chen, Zheng
中科院分区：
文献类型：
--
作者：
Chen, Zheng
本文研究了从向外传播的球形火焰测量层流火焰速度的准确性。我们专注于甲烷/空气混合物在正常的温度和压力，有各种数据集的文献报道。层流火焰速度的测量存在较大的误差，这使得这些实验数据不利于抑制化学模型的不确定性。不同来源的不确定性/不准确性（包括混合物的制备，点火，浮力，不稳定性，约束，辐射，非线性拉伸行为，和外推）进行了讨论，并与1-D模拟的帮助下，在层流火焰速度测量大的差异，他们的贡献进行了评估。结果表明，当量比的不确定性会给层流火焰速度测量带来很大的不一致性，尤其是对于非化学计量比的混合气和使用正常或低精度压力计的实验。对于富燃料的甲烷/空气混合物，层流火焰速度测量的大偏差可能部分是由非线性拉伸行为和外推造成的。讨论了不同不确定度源的影响随初始压力、初始温度和燃料碳数的变化。此外，它表明，在原始实验数据的差异可能会隐藏后进行外推。因此，应报告用于外推的数据以及提取的结果，并与模拟或其他实验进行比较。文中还提出了用球形传播火焰测量层流火焰速度的建议。
The present work investigates the accuracy of laminar flame speeds measured from outwardly propagating spherical flames. We focus on methane/air mixtures at normal temperature and pressure, for which there is a variety of data sets reported in the literature. It is observed that there are large discrepancies in laminar flame speed measurement, which makes these experimental data unhelpful for restraining the uncertainty of chemical models. Different sources of uncertainty/inaccuracy (including mixture preparation, ignition, buoyancy, instability, confinement, radiation, nonlinear stretch behavior, and extrapolation) are discussed and their contributions to large discrepancies in laminar flame speed measurement are assessed with the help of 1-D simulation. It is found that the uncertainty in equivalence ratio can bring large inconsistency in laminar flame speed measurement, especially for off-stoichiometric mixtures and experiments using pressure gauge with normal or low accuracy. For fuel-rich methane/air mixtures, the large deviations in laminar flame speed measurement could be partly caused by nonlinear stretch behavior and extrapolation. The change of the influence of different sources of uncertainty with initial pressure, initial temperature, and fuel carbon number is also discussed. Furthermore, it is shown that the discrepancy in raw experimental data can be possibly hidden after extrapolation is conducted. Therefore, the data used for extrapolation as well as extracted results should be reported and compared with simulation or other experiments. The recommendations on the laminar flame speeds measurement using the propagating spherical flames are also provided.
登录
查看更多内容
影响因子：
4.4
作者：
Halter, F.;Tahtouh, T.;Mounaim-Rousselle, C.
通讯作者：
Mounaim-Rousselle, C.
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
影响因子：
4.4
作者：
Zhang, Hai;Podfilipski, Jerzy;Jarosinski, Jozef;Wang, Shuang-Feng;Gorczakowski, Andrzej
通讯作者：
Gorczakowski, Andrzej
DOI：
10.1016/j.proci.2014.05.065
发表时间：
2015
期刊：
--
影响因子：
--
作者：
Fujia Wu;W. Liang;Zheng Chen;Y. Ju;C. Law
通讯作者：
Fujia Wu;W. Liang;Zheng Chen;Y. Ju;C. Law
具有热敏中间动力学的球形火焰引发和传播
影响因子：
4.4
作者：
Zhang, Huangwei;Chen, Zheng
通讯作者：
Chen, Zheng
DOI：
10.1016/s0082-0784(00)80581-0
发表时间：
2000
期刊：
--
影响因子：
--
作者：
S. Tse;D. L. Zhu;C. Law
通讯作者：
S. Tse;D. L. Zhu;C. Law