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Systematic approach based on holographic interferometry measurements to characterize the flame structure of partially premixed flames

机译：基于全息干涉测量的系统方法来表征部分预混火焰的火焰结构

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Partially premixed flames (PPF's) represent a class of hybrid flames that contain multiple reaction zones. A detailed understanding of the temperature distribution in PPF's is important from both practical and scientific considerations. Path-integrated or line-of-sight measurement techniques, such as holographic interferometry (HI), that are based on the change in the optical phase of a light beam can be used to reconstruct the refractive index n in flames and thereafter to infer the temperature distribution. Therefore to describe the flame structure in the context of these measurements requires that a systematic approach be developed that relates the density, the temperature, and the composition to the refractive index. We demonstrate that a conserved scalar ξ that transforms the flame structure from a spatial to a generic distribution can be inferred from the refractive-index distribution. Thereafter measurements of the density, the temperature, and the composition in two-dimensional PPF's become feasible. We report the first application, to our knowledge, of this method to HI. Specifically, we used HI to measure the refractive-index distributions in methane-air PPF's. One PPF is a double flame that has two reaction zones, and the other is a triple flame that contains three reaction zones. We have applied the procedure to infer the distribution of the modified mixture fraction and thereafter the local temperature and the local mass fractions. We find the local temperature differences, ΔT(x,y)=|T[n(x,y)]-T′[ξ(x,y)]|, to be relatively small. We conclude that it is possible to use HI to infer the mixture-fraction distribution and thereafter the flame structures by the application of state relations in the case of PPF's.
机译：部分预混火焰（PPF's）是一类包含多个反应区的混合火焰。从实际和科学角度出发，对PPF中温度分布的详细了解都很重要。基于光束的光学相位变化的路径集成或视线测量技术（例如全息干涉术（HI））可用于重建火焰中的折射率n，然后推断出温度分布。因此，在这些测量的背景下描述火焰结构需要开发一种系统的方法，该方法将密度，温度和组成与折射率相关联。我们证明，可以从折射率分布推断出将火焰结构从空间分布转换为通用分布的守恒标量ξ。此后，二维PPF中密度，温度和组成的测量变得可行。据我们所知，我们将此方法报告给HI。具体来说，我们使用HI来测量甲烷空气PPF中的折射率分布。一个PPF是具有两个反应区的双火焰，另一个是包含三个反应区的三重火焰。我们已经应用该程序来推断改性混合物分数的分布，然后推断局部温度和局部质量分数。我们发现局部温差ΔT（x，y）= | T [n（x，y）]-T'[ξ（x，y）] |相对较小。我们得出结论，在PPF的情况下，可以通过使用状态关系使用HI来推断混合物的分数分布，然后推断火焰结构。

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