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首页> 外文期刊>Fuel >Non-intrusive optical diagnostics of co- and counter-swirling flames in a dual swirl pulverized coal combustion burner
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Non-intrusive optical diagnostics of co- and counter-swirling flames in a dual swirl pulverized coal combustion burner

机译：双涡旋煤粉燃烧器中同向和反向旋转火焰的非侵入式光学诊断

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Optical non-intrusive measurements are performed to a 10 kWth laboratory-scale dual swirl pulverized coal combustion burner in order to elucidate the behaviors of internal recirculation zone (IRZ) and heat release region. The pulverized coal flame is operated with four different swirl combinations: co-swirling (low-and high-swirl) and counter-swirling (low-and high-swirl). The flow field is measured using particle image velocimetry (PIV). The IRZ area increases for the high-swirl conditions than that in the low-swirl conditions. With changing from co-to counter-swirl combination, the IRZ appearance changes from a heart-to an elongate-shape IRZ because double stagnation points for the co-swirling flames merges to one stagnation point for the counter-swirling flames. For the co-swirling conditions, a tube-type vortex is detected at the end of the IRZ near the double stagnation points. However, it is not present in the counter-swirling conditions. From two-color pyrometry, the overall temperature in the high-swirl flames is lower than the low-swirl flames. For the counter-swirling flames, higher temperature is observed due to the better mixing, which allows for a more intense combustion reaction of pulverized coal particles. Flame color measurements (OH and CH chemiluminescence band light emission) shows that the devolatilization of coal particles is observed at more upstream region comparing with the heat release reaction for volatile gas combustion. For the high-swirl flames, the CH/band intensity for heat release decreases, however its overall dimension increases. For the counter-swirling flames, the higher heat release is observed. (c) 2016 Published by Elsevier Ltd.
机译：为了阐明内部再循环区（IRZ）和放热区的行为，对10 kWth实验室规模双涡旋煤粉燃烧器进行了光学非侵入式测量。煤粉火焰通过四种不同的旋流组合进行操作：共同旋流（低旋流和高旋流）和反向旋流（低旋流和高旋流）。使用粒子图像测速仪（PIV）测量流场。高涡流条件下的IRZ面积要比低涡流条件下的IRZ面积大。随着从共涡流到反旋流组合的变化，IRZ外观从心形变为长形IRZ，因为共涡流火焰的两个停滞点合并为反旋流火焰的一个停滞点。对于共涡旋条件，在IRZ的末端附近双停滞点处检测到管状涡旋。但是，它在反向旋转条件下不存在。根据双色高温计，高旋流火焰的整体温度低于低旋流火焰。对于反向旋转的火焰，由于更好的混合而观察到较高的温度，这使粉煤颗粒的燃烧反应更强烈。火焰色度测量（OH和CH化学发光带发光）表明，与挥发性气体燃烧的放热反应相比，在更上游的区域观察到煤颗粒的脱挥发分。对于高旋流火焰，用于释放热量的CH /带强度会降低，但是其整体尺寸会增加。对于反向旋转的火焰，观察到较高的热量释放。 （c）2016由爱思唯尔有限公司出版。

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