Non-normality in combustion-acoustic interaction in diffusion flames: a critical revision
Non-normality in combustion-acoustic interaction in diffusion flames: a critical revision
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扩散火焰中燃烧声相互作用的非正态性：重要修订
DOI：
10.1017/jfm.2013.468
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发表时间：
2013
影响因子：
3.7
通讯作者：
Magri L
中科院分区：
文献类型：
--
作者：
Magri L
即使系统是线性稳定的，非正态系统中的扰动也会瞬时增长。如果这种瞬态增长足够大，它可以从小的初始扰动触发自持振荡。这对燃烧声振荡具有重要的实际影响，燃烧声振荡是火箭和飞机发动机中的一个持久问题。Balasubramanian和Sujith（J. Fluid Mech.，第594卷，2008年，pp. 29-57）模拟了声导管中的无限速率化学扩散火焰，并发现该系统中的瞬态增长可以将初始能量放大一个因子，被发现为1到10的数量级，这表明非正态性并不像它被认为的那样有影响力。
Perturbations in a non-normal system can grow transiently even if the system is linearly stable. If this transient growth is sufficiently large, it can trigger self-sustained oscillations from small initial disturbances. This has important practical consequences for combustion–acoustic oscillations, which are a persistent problem in rocket and aircraft engines. Balasubramanian & Sujith (J. Fluid Mech., vol. 594, 2008, pp. 29–57) modelled an infinite-rate chemistry diffusion flame in an acoustic duct and found that the transient growth in this system can amplify the initial energy by a factor, is found to be of the order of 1 to 10, revealing that non-normality is not as influential as it was thought to be.