Excitation of thermoacoustic oscillations by small premixed flames

被引：9

作者：

Coats, C. M. ^{[1
]}

Chang, Z. ^{[1
]}

Williams, P. D. ^{[1
]}

机构：

[1] Univ Leicester, Dept Engn, Leicester LE1 7RH, Leics, England

来源：

COMBUSTION AND FLAME | 2010年 / 157卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

Laminar premixed flames; Combustion instability; Thermoacoustic oscillations; Practical combustion systems; Planar laser-induced fluorescence; MARKSTEIN NUMBERS; ANCHORED FLAMES; METHANE-AIR; LAMINAR; DYNAMICS; BURNERS; MODEL; COUNTERFLOW; BEHAVIOR;

D O I：

10.1016/j.combustflame.2010.01.017

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Experiments have been carried out in which very small lean premixed flames closely representative of those formed by modern multiport domestic gas burners have been subjected to controlled acoustic perturbation. PLIF from CH has been used to visualise the flame response and the heat-release-rate fluctuations have been evaluated directly from the flame images. It is shown that small laminar flames can amplify the effects of acoustic velocity fluctuations by mechanisms that do not involve resonant heat loss to the burner and that the fluctuations in flame-front area are not adequately characterised by a Strouhal number alone. The measured transfer function is compared with the predictions of various analytical formulations and a new model of the flame oscillation is proposed which applies specifically to situations in which the design of the burner renders the flame base immobile. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：1037 / 1051

页数：15

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