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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.2; 20070514-17; Montreal(CA) >THE EFFECTS OF FUEL COMPOSITION ON FLAME STRUCTURE AND COMBUSTION DYNAMICS IN A LEAN PREMIXED COMBUSTOR
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THE EFFECTS OF FUEL COMPOSITION ON FLAME STRUCTURE AND COMBUSTION DYNAMICS IN A LEAN PREMIXED COMBUSTOR

机译：燃料组成对稀混合气燃烧器火焰结构和燃烧动力学的影响

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摘要

The stability characteristics of a laboratory-scale lean premixed combustor operating on natural gas - hydrogen fuel mixtures have been studied in a variable length combustor facility. The fuel and air were mixed upstream of the choked inlet to the combustor to eliminate equivalence ratio fluctuations and thereby ensure that the dominant instability driving mechanism was flame-vortex interaction. The inlet velocity, inlet temperature, equivalence ratio and percent hydrogen in the fuel were systematically varied, and at each operating condition the combustor pressure fluctuations were measured as a function of the combustor length. The results are presented in the form of two-dimensional stability maps, which are plots of the normalized rms pressure fluctuation versus the equivalence ratio and the combustor length, for a given inlet temperature, inlet velocity, and fuel mixture. In order to understand the effects of operating conditions and fuel composition on the observed stability characteristics, two-dimensional chemiluminescence images of the flame structure were recorded at all operating conditions and for all fuel mixtures under stable conditions. Changes in the stable flame structure, as characterized by the location of the flame's "center of heat release", were found to be consistent with the observed instability characteristics. The location of the flame's "center of heat release" was found to lie along a single path for all operating conditions and fuel mixtures. It was also observed that there were regions of stable and unstable combustion as one moved along this path. Furthermore it was found that flames having the same "center of heat release" location, but different operating conditions and fuel composition, have very nearly the same flame shape. These results will be useful for developing phenomenological models for predicting unstable combustion.
机译：在可变长度的燃烧室设备中，已经研究了在天然气-氢燃料混合物上运行的实验室规模的稀薄预混燃烧室的稳定性特征。燃料和空气在节流阀入口到燃烧室的上游进行混合，以消除当量比波动，从而确保主要的不稳定性驱动机理是火焰-涡旋相互作用。燃料中的入口速度，入口温度，当量比和氢百分比被系统地改变，并且在每种工况下，燃烧器压力波动被测量为燃烧器长度的函数。结果以二维稳定性图的形式显示，对于给定的入口温度，入口速度和燃料混合物，该图是归一化的均方根压力波动与当量比和燃烧室长度的关系图。为了理解操作条件和燃料成分对观察到的稳定性特征的影响，在所有操作条件下以及在稳定条件下对所有燃料混合物记录了火焰结构的二维化学发光图像。发现以火焰“放热中心”的位置为特征的稳定火焰结构的变化与观察到的不稳定性特征一致。对于所有工作条件和燃料混合物，发现火焰的“放热中心”位于一条路径上。还观察到，当有人沿着该路径移动时，存在稳定和不稳定的燃烧区域。此外，还发现具有相同“放热中心”位置，但工作条件和燃料成分不同的火焰具有几乎相同的火焰形状。这些结果将有助于开发用于预测不稳定燃烧的现象学模型。

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