The Effect of a Laminar Moving Flame Front on Thermoacoustic Oscillations of an Anchored Ducted V-Flame
The Effect of a Laminar Moving Flame Front on Thermoacoustic Oscillations of an Anchored Ducted V-Flame
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DOI：
10.1080/00102202.2014.950371
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发表时间：
2015-03
影响因子：
1.9
通讯作者：
C. Luzzato;A. Morgans
中科院分区：
文献类型：
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作者：
C. Luzzato;A. Morgans
在使用分析模型研究燃烧不稳定性时，之前假设紧凑火焰假设意味着不需要考虑火焰前锋运动来解决声学问题。这篇文章表明事实并非一定如此。本文对此类锚定 V 型火焰模型进行了概括，允许声波的火焰“源”及时改变其位置，从而跟踪火焰前锋位置。然后提出解决该问题的方法。研究发现，考虑火焰前锋运动可以改变燃烧器的线性稳定性和（对于保持不稳定的情况）极限循环幅度。在大范围的操作条件下观察到极限循环振幅的显着变化。到目前为止，火焰前锋运动仅被认为提供了稳定效果，减少了瑞利源项。自调节调节器自适应控制方法似乎不受考虑移动火焰前锋的影响。
When investigating combustion instabilities using analytical models, it has previously been assumed that the compact flame assumption implied that the flame-front movement did not need to be taken into account to solve the acoustics. This article shows that this is not necessarily the case. This article presents a generalization of such models of anchored V-flames to allow the flame “source” of acoustic waves to vary its position in time so as to track the flame-front location. A method for solving this problem is then presented. It is found that accounting for the flame front movement can alter both the linear stability of the combustor, and (for cases that remain unstable) the limit cycle amplitude. Significant changes in limit cycle amplitude are observed across a large range of operating conditions. The flame front movement has so far only been seen to provide a stabilizing effect, reducing the Rayleigh source term. Self-tuning regulator adaptive control methods appear to be unaffected by accounting for the moving flame front.