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首页> 外文期刊>Combustion Science and Technology >PREMIXED TURBULENT FLAME STRUCTURES IN MODERATE AND INTENSE ISOTROPIC TURBULENCE
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PREMIXED TURBULENT FLAME STRUCTURES IN MODERATE AND INTENSE ISOTROPIC TURBULENCE

机译：中度和强等距湍流的预混湍流火焰结构

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Several 2-D imaging techniques including planar laser induced fluorescence for OH (OH-PLIF) have been used to investigate premixed turbulent flame structures under moderate to intense isotropic turbulence. Unconditioned velocity statistics were measured by laser Doppler anemometry. The experiments used a low-swirl burner that produces high intensity near-isotropic turbulence. The goal is to gain better insights into the flame structures at high turbulence and to test and verify the concept of the "distributed reaction zones" regime. Four methane/air flames (φ = 0.7) have been studied with 0.5<μ′< 2.2 m/s. A linear correlation for the flame speed, S_f, is found: S_f/S_L = 2.12(μ′/S_L) + 1. Sets of 200 OH-PLIF images obtained for each flame clearly show that flame wrinkling is a random process. The probability of the flame having very small wrinkles is relatively low. This strongly suggests that the penetration of small intense eddies into the flame sheet to generate a "distributed reaction zone" is statistically an extremely rare event. The OH-PLIF images were processed to determine statistical properties of the mean flame curvatures and flame lengths for comparison with turbulence intensity and turbulent length scales. The results show that the increase in turbulent kinetic energy generates larger mean curvatures of the flame fronts, and a linear increase in the flame surface area ratio estimated from the mean flame length measurement.
机译：包括平面激光诱导的OH荧光（OH-PLIF）在内的几种2-D成像技术已被用于研究中等至强各向同性湍流下的预混湍流火焰结构。通过激光多普勒风速仪测量无条件速度统计数据。实验使用了低涡流燃烧器，该燃烧器产生了高强度的近等向湍流。目的是更好地了解高湍流下的火焰结构，并测试和验证“分布式反应区”制度的概念。已经研究了四次甲烷/空气火焰（φ= 0.7），燃烧速度为0.5 <μ'<2.2 m / s。发现与火焰速度S_f呈线性关系：S_f / S_L = 2.12（μ'/ S_L）+1。为每个火焰获得的200张OH-PLIF图像集清楚地表明，火焰起皱是随机过程。火焰具有非常小的皱纹的可能性相对较低。这有力地表明，从统计学上来说，小的强涡旋渗透到火焰片中以产生“分布的反应区”是极为罕见的事件。对OH-PLIF图像进行处理，以确定平均火焰曲率和火焰长度的统计特性，以便与湍流强度和湍流长度尺度进行比较。结果表明，湍动能的增加会产生较大的火焰锋面平均曲率，并且根据平均火焰长度测量值估算出的火焰表面积比会呈线性增加。

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