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首页> 外文期刊>Combustion Science and Technology >BLOWOFF CHARACTERISTICS OF BLUFF-BODY STABILIZED CONICAL PREMIXED FLAMES IN A DUCT WITH UPSTREAM SPATIAL MIXTURE GRADIENTS AND VELOCITY OSCILLATIONS
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BLOWOFF CHARACTERISTICS OF BLUFF-BODY STABILIZED CONICAL PREMIXED FLAMES IN A DUCT WITH UPSTREAM SPATIAL MIXTURE GRADIENTS AND VELOCITY OSCILLATIONS

机译：带有上游空间混合梯度和速度振荡的管道中钝体稳定的锥形预混合火焰的吹出特性

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摘要

An experimental study of flame hlowoff phenomenon in a bluff body stabilized flame confined in a cylindrical duct is presented. Blowoff equivalence ratios were determined for two approach velocities and three different upstream equivalence ratio profiles (uniform, inner, and outer fuel enrichment) in the absence and presence of imposed upstream velocity oscillations. The results were compared with those for the unconfined flame configuration as well. It is found that the blowoff equivalence ratios exhibit somewhat different trends for different approach velocities. For the uniform mixture profile, blowoff equivalence ratio first increases with increasing excitation frequency and then decreases at higher frequencies for the approach velocity of 5 mls. For the 11 mls approach velocity, the trend is different, and the blowoff equivalence ratio continuously increases with increasing excitation frequency. The blowoff equivalence ratios are higher for the confined flame configuration. An empirical correlation of the hlowoff data for the uniform mixture profile is presented in terms of Damkohler, Reynolds, and Strouhal numbers. Finally, analysis of the CH~* chemilumi-nescence signal as blowoff condition is approached shows emergence of low-frequency oscillations that are connected with intermittency of the localized flame weakening andlor extinction near the flame stabilization region.
机译：提出了一种在封闭在圆柱管内的钝体稳定火焰中火焰降落现象的实验研究。在没有和存在强加的上游速度振荡的情况下，确定了两种进场速度和三种不同的上游当量比分布图（均匀，内部和外部燃料富集）的排污当量比。还将结果与无限制火焰配置的结果进行了比较。发现对于不同的进场速度，吹扫当量比呈现出一些不同的趋势。对于均匀的混合物轮廓，对于5 mls的接近速度，吹扫当量比首先随着激励频率的增加而增加，然后在较高的频率下降低。对于11毫升逼近速度，趋势是不同的，并且随着激发频率的增加，吹扫当量比不断增加。对于受限火焰配置，吹气当量比较高。均匀混合曲线下吹量数据的经验相关性用达姆科勒数，雷诺数和斯特劳哈尔数表示。最后，在接近吹扫条件时对CH〜*化学发光信号的分析表明，低频振荡的出现与火焰稳定区域附近局部火焰减弱和/或熄灭的间歇性有关。

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