Response of Triple Flame to Temporal Change in Concentration Gradient
Response of Triple Flame to Temporal Change in Concentration Gradient
复制标题
三重火焰对浓度梯度随时间变化的响应
DOI：
10.1299/kikaib.70.789
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
G. Masuya
中科院分区：
文献类型：
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作者：
M. Hirota;M. Mizomoto;G. Masuya
本文研究了甲烷-空气三重火焰特性与浓度梯度的关系。为了控制升腾火焰的稳定性，必须了解浓度梯度过渡变化的火焰行为。为此，利用浓度梯度从陡峻到平缓或相反的时间变化，对三重火焰的响应进行了实验研究。采用颗粒图像测速法对火焰前缘的流场结构进行了测量，以了解火焰前缘浓度梯度变化的机理。结果表明：情形B（从平缓到平缓）的火焰前缘比情形A（从平缓到平缓）的火焰前缘从改变浓度梯度前的稳态到改变浓度梯度后的稳态的路径要长。也就是说，在情况A和情况b之间存在不同的行为（迟滞）。这是因为火焰前缘的路径发生了变化，从而产生了迟滞现象。
This research proposes a study of the methane-air triple flame characteristics related to concentration gradients. Flame behaviors of transitional change in concentration gradients have to be understood for stability control of lifted flame. For this purpose, response of triple flame is studied experimentally using temporal change of concentration gradient from steep to gentle or opposite. The flow field structures were measured by particle image velocimetry to understand the mechanism of changing concentration gradients in front of the leading edge of the flame. The results are that, the leading edge of the flame in Case B (from gentle to steep) takes longer route than Case A (from steep to gentle) from steady state before changing concentration gradient to steady state after changing concentration gradient. That is to say, there are different behavior (hysteresis) between Case A and Case B. Flow lines are extended unsymmetrical in steep condition. This is because the route of the leading edge of the flame changes so that hysteresis behavior occur.