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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Experimental investigations and large-eddy simulation of low-swirl combustion in a lean premixed multi-nozzle combustor
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Experimental investigations and large-eddy simulation of low-swirl combustion in a lean premixed multi-nozzle combustor

机译：稀薄预混多喷嘴燃烧室低涡流燃烧的实验研究和大涡模拟

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This paper presents laser diagnostic experiments and large-eddy simulations (LES) of low-swirl lean premixed methane/air flames in a multi-nozzle combustor including five nozzles with the same structure. OH planar laser-induced fluorescence is used to observe flame shapes and identify main reaction zones. NOx and CO emissions are also recorded during the experiment. The flows and flames are studied at different equivalence ratios ranging from 0.5 to 0.8, while the bulk inlet velocity is fixed at 6.2 m/s. Results show that the neighboring swirling flows interact with each other, generating a highly turbulent interacting zone where intensive reactions take place. The flame is stabilized above the nozzle rim, and its liftoff height decreases with increasing equivalence ratio. The center flow is confined and distorted by the neighboring flows, resulting in instabilities of the center flame. Mean OH radical images reveal that the center nozzle flame is extinguished when equivalence ratio is equals to 0.5, which is successfully predicted by LES. In addition, NOx emissions show log-linear dependency on the adiabatic flame temperature, while the CO emissions remain lower than 10 ppm. NOx emissions for multi-nozzle flame are less sensitive to the flame temperature than that for single nozzle. These results demonstrate that the low-swirl multi-nozzle concept is a promising solution to achieve stable combustion with ultra-low emissions in gas turbines.
机译：本文介绍了在多喷嘴燃烧器（包括五个结构相同的喷嘴）中低旋流稀薄甲烷/空气火焰的激光诊断实验和大涡模拟（LES）。 OH平面激光诱导的荧光用于观察火焰形状并识别主要反应区域。实验期间还记录了NOx和CO的排放。在0.5至0.8的不同当量比下研究流动和火焰，而整体入口速度固定为6.2 m / s。结果表明，相邻的旋流彼此相互作用，在发生强烈反应的地方产生了高度湍流的相互作用区域。火焰在喷嘴边缘上方稳定，并且其上升高度随当量比的增加而降低。中心流受到相邻流的限制和扭曲，导致中心火焰不稳定。平均OH自由基图像显示当当量比等于0.5时，中心喷嘴火焰熄灭，这是LES成功预测的。此外，NOx排放量与绝热火焰温度呈对数线性关系，而CO排放量仍低于10 ppm。与单喷嘴相比，多喷嘴火焰的NOx排放对火焰温度的敏感性较低。这些结果表明，低涡流多喷嘴概念是在燃气轮机中以超低排放量实现稳定燃烧的有前途的解决方案。

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