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Thin reaction zone and distributed reaction zone regimes in turbulent premixed methane/air flames: Scalar distributions and correlations

机译：甲烷/空气湍流混合气体中的薄反应区和分布反应区方案：标量分布和相关性

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A series of premixed turbulent methane/air jet flames in the thin reaction zone (TRZ) and distributed reaction zone (DRZ) regimes were studied using simultaneous three-scalar high-resolution imaging measurements, including HCO/OH/CH2O, CH/OH/CH2O, T/OH/CH2O and T/CH/OH/. These scalar fields offer a possibility of revisiting the structures of turbulent premixed flames in different combustion regimes. In particular, CH2O provides a measure of the preheat zone, CH/HCO a measure of the inner layer of the reaction zone, and OH a measure of the oxidation zone. Scalar correlations are analyzed on both single-shot and statistical basis, and resolvable correlated structures of 100 pm between scalars are captured. With increasing turbulence intensity, it is shown that the preheat zone and the inner layer of the reaction zone become gradually broadened/distributed, and the correlation between HCO and [OH](LIF)[CH2O](LIF) decreases. A transition from the TRZ regime to the DRZ regime is found around Karlovitz number of 70-100. The physical and chemical effects on the broadening of the flame are investigated. In the TRZ regime the inner layer marker CH and HCO remains thin in general although occasional local broadening of CH/HCO could be observed. Furthermore, there is a significant probability of finding CH and HCO at rather low temperatures even in the TRZ regime. In the DRZ regime, the broadening of CH and HCO are shown to be mainly a result of local reactions facilitated by rapid turbulent transport of radicals and intermediate reactants in the upstream of the reaction paths. Differential diffusion is expected to have an important effect in the DRZ regime, as H radicals seemingly play a more important role than OH radicals. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：使用同步三标量高分辨率成像测量方法，包括稀反应区（TRZ）和分布反应区（DRZ），研究了一系列预混合的甲烷/空气湍流火焰，包括HCO / OH / CH2O，CH / OH / CH2O，T / OH / CH2O和T / CH / OH /。这些标量场提供了在不同燃烧状态下重新研究湍流预混火焰结构的可能性。特别地，CH 2 O提供了预热区的量度，CH / HCO提供了反应区的内层的量度，而OH提供了氧化区的量度。在单次和统计基础上分析标量相关性，并捕获标量之间100 pm的可解析相关结构。随着湍流强度的增加，预热区和反应区的内层逐渐变宽/分布，并且HCO与[OH]（LIF）[CH2O]（LIF）之间的相关性降低。卡洛维兹数为70-100时，发现从TRZ政权过渡到DRZ政权。研究了火焰扩展的物理和化学作用。在TRZ模式下，尽管偶尔会观察到CH / HCO局部增宽，但内层标记CH和HCO通常保持较薄。此外，即使在TRZ模式下，也有可能在相当低的温度下发现CH和HCO。在DRZ体制中，CH和HCO的增宽主要是由于自由基和中间反应物在反应路径上游快速湍流传输而促进的局部反应的结果。差异扩散有望在DRZ机制中发挥重要作用，因为H自由基似乎比OH自由基更重要。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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