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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Rapidly mixed combustion in a tubular flame burner
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Rapidly mixed combustion in a tubular flame burner

机译：在管状火焰燃烧器中快速混合燃烧

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摘要

To meet increased demands for large heat output and safety combustion in tubular flame burners, a new technique of rapidly mixed combustion, in which fuel and air are separately injected, and hence flame flashback will not occur, has been proposed. To elucidate the validity of this technique, experiments have been conducted with optically accessible burners. Results show that a tubular flame can be successfully obtained for a wide range of overall equivalence ratios and inlet injection velocities. From summarizing the results obtained with different diameter and different slit-width burners, it is found that the swirl number of the burner should be larger than about 5 and the inlet velocity of air should be larger than a few decades of m/s for the establishment of rapidly mixed combustion. However, flame nonuniform luminosity appears, especially on the fuel-rich side, and the flame diameter and length are somewhat different from those of premixed combustion. Detailed measurements on the flame structure for the stoichiometric methane/air mixture show that although the temperature distribution and its attained maximum temperature are almost the same as those of premixed combustion, the peak values of OH and CH chemiluminescence are reduced and their profiles shrink. It is, however, interesting to note that the laser induced fluorescence signal of NO in the burned gas becomes about 30% lower than in premixed combustion. Thus, although the detailed flame structure of rapidly mixed combustion is different from that of premixed combustion, the rapidly mixed combustion is very safe because flame flashback will not occur, and it has the potential for reducing NOx emission by controlling the flame structure through the mixing rate.
机译：为了满足在管状火焰燃烧器中对大热量输出和安全燃烧的不断增长的需求，已经提出了一种快速混合燃烧的新技术，在该技术中，燃料和空气被分开喷射，因此不会发生火焰回火。为了阐明该技术的有效性，已经对光学可接近的燃烧器进行了实验。结果表明，可以在很宽的总当量比和入口喷射速度范围内成功获得管状火焰。通过总结使用不同直径和不同狭缝宽度的燃烧器获得的结果，发现燃烧器的旋流数应大于约5，并且空气的进气速度应大于数十m / s。建立快速混合燃烧。然而，出现火焰不均匀的发光度，尤其是在燃料丰富的一侧，并且火焰的直径和长度与预混燃烧的有所不同。对化学计量的甲烷/空气混合物的火焰结构进行的详细测量表明，尽管温度分布及其达到的最高温度与预混燃烧的温度分布及其达到的最高温度几乎相同，但是OH和CH化学发光的峰值降低了，并且它们的轮廓缩小。但是，有趣的是，燃烧气体中激光诱导的NO的荧光信号比预混合燃烧低了约30％。因此，尽管快速混合燃烧的详细火焰结构与预混合燃烧的详细火焰结构不同，但是快速混合燃烧是非常安全的，因为不会发生火焰回火，并且具有通过混合控制火焰结构来减少NOx排放的潜力。率。

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