Dynamics of acoustically forced non-premixed flames close to blow-off

被引：14

作者：

Kypraiou, Anna-Maria ^{[1
]}

Giusti, Andrea ^{[1
]}

Allison, Patton M. ^{[1
]}

Mastorakos, Epaminondas ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2018年 / 95卷

基金：

英国工程与自然科学研究理事会;

关键词：

Non-premixed flame; Blow-off; Lean blow-off limits; Acoustic oscillations; Thennoacoustics; Lift-off height; VELOCITY OSCILLATIONS; EXTINCTION;

D O I：

10.1016/j.expthermflusci.2018.01.036

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The effect of forced oscillations on the behaviour of non-premixed swirling methane flames close to the lean blow out limits was investigated using experiments in a lab-scale burner. Two different fuel injection geometries, non-premixed with radial -NPR- and non-premixed with axial -NPA- fuel injection, are considered. The flame behaviour is studied using 5 kHz OH center dot chemiluminescence and OH Planar Laser Induced Fluorescence (OH PLIF) imaging. In both systems, acoustic forcing reduces the stability of the flame, and in particular, the stability was found to decrease with the increase in forcing amplitude. Flame lift-off was observed in both configurations, with the magnitude of the effect of forcing depending on the fuel injection configuration. The results provide insight on the effect of superimposed flow field fluctuations in systems operating close to the lean blow out limits and offer useful data for the development and validation of numerical models for the prediction of the dynamic behaviour of flames of industrial interest.

引用

页码：81 / 87

页数：7

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