期刊
FLOW MEASUREMENT AND INSTRUMENTATION
卷 46, 期 -, 页码 12-17出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.flowmeasinst.2015.09.001
关键词
Flame/acoustic wave interaction; Standing wave; Nonlinear coupling; PIV
资金
- EPSRC [EP/G063044/1]
- EPSRC [EP/G063044/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G063044/1] Funding Source: researchfish
This is an experimental investigation to study the nonlinear coupling characteristics of a propane/air flame with acoustic standing waves, using chemiluminescence emission and phase-locked PIV measurements. A variety of coupling modes are observed for the excitation source with combustion instability oscillations and its harmonics and sub-harmonics. The frequency analysis shows that flame/acoustic coupling behaviour results in complex nonlinear coupling. The coupling behaviour is weak at lower excitation intensities (0.3 V). At a voltage amplitude of 2 V, the results show that the excitation frequency (f(e)) is only coupled with the sub-harmonic frequency (f(e)/5) for the premixed flame. However, for the diffusion flame, more complex frequency components are observed, which exhibit relationships of fe +/- f(f) and f(e) +/- f(e)/5. At a voltage amplitude of 13.7 V, the sub-harmonic frequencies (2f(e)/5 and 3f(e)/5) and the premixed flame buoyancy oscillations (f(f)) are increased. Ply measurements provide detailed flow velocity vector fields in an acoustically excited tube for different phase angles and the effect on the flames at different equivalence ratios, which increases the understanding of flame oscillation behaviour. It is found that all of the nonlinear phenomena that are observed occur because of the coupling between buoyant and acoustic excitation and create complex nonlinear frequency couplings. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据