Direct and indirect measurements of Markstein numbers of premixed flames
Direct and indirect measurements of Markstein numbers of premixed flames
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DOI：
10.1016/0010-2180(90)90004-b
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发表时间：
1990-12
影响因子：
4.4
通讯作者：
G. Searby;J. Quinard
中科院分区：
文献类型：
--
作者：
G. Searby;J. Quinard
这项工作报告了对氢、甲烷、乙烯和丙烷的预混稀释火焰的马克斯坦数（对应变和曲率的敏感性）的实验测量。对弱拉伸自由传播的准平面火焰进行了测量。提出并比较了三种不同的推导马克斯坦数的方法——一种直接方法，其中拉伸和燃烧速度的变化是局部测量的，一种基于火焰对周期性剪切流的响应幅度的全局方法，第三种方法将马克斯坦数与燃烧速度联系起来，在燃烧速度下，未受扰动的火焰自发地形成细胞结构。人们发现直接法给出的结果最不精确。
This work reports experimental measurements of the Markstein number (sensitivity to strain and curvature) of premixed diluted flames of hydrogen, methane, ethylene, and propane. Measurements are made on weakly stretched freely propagating quasi-planar flames. Three different methods of deducing the Markstein number are presented and compared—a direct method in which the stretch and the change in burning velocity are measured locally, a global method based on the amplitude of the response of the flame to a periodic shear flow, and a third method that relates the Markstein number to the burning velocity at which an unperturbed flame spontaneously develops cellular structures. The direct method is found to give the least precise results.