Investigations on the competition between acoustic and intrinsic thermoacoustic modes due to multi-flame interaction

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-03-24 DOI:10.1016/j.ast.2025.110159

Siyi Zhang , Xiaokang Liu , Yu Tian , Dongbin Wang , Jingxuan Li , Lijun Yang

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引用次数: 0

Abstract

Thermoacoustic instabilities typically consist of two modes: the acoustic instability mode and the intrinsic thermoacoustic (ITA) mode. These modes can coexist and compete under certain conditions within a combustor. This paper investigates the impact of multi-flame interaction on mode competition within a model combustor – a length-adjustable Rijke tube. Mode competition was explored by independently varying the chamber's acoustic characteristics (via Rijke tube length) and the multi-flame response characteristics (through injector hole distribution). The thermoacoustic response of the multi-flame system was examined using an acoustic pressure sensor and CH* chemiluminescence technique. The dynamic properties of the multi-flame flow field were captured with a high-speed camera and particle image velocimetry (PIV). Results showed that different multi-flame interactions can alter the flame transfer function (FTF), leading to combustion instability dominated by either the acoustic mode or the ITA mode. The experimental results were combined with a low-order acoustic network model (LOM) to study the transition and competition between acoustic and ITA instability under multi-flame interactions. The predictions of the LOM for the eigenfrequencies and growth rates of the combustion system can accurately describe the occurrence trend of the acoustic and ITA modes.

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多火焰相互作用下声模与本征热声模竞争的研究

热声不稳定性通常包括两种模式：声不稳定性模式和本征热声（ITA）模式。这些模式可以共存，并在一定条件下在燃烧器内竞争。本文研究了可调长度Rijke管模型燃烧室中多火焰相互作用对模态竞争的影响。通过独立改变燃烧室的声学特性（通过Rijke管长度）和多火焰响应特性（通过喷油器孔分布）来探索模式竞争。采用声压传感器和CH*化学发光技术研究了多火焰系统的热声响应。采用高速摄像机和粒子图像测速技术（PIV）捕捉了多火焰流场的动态特性。结果表明，不同的多火焰相互作用会改变火焰传递函数（FTF），导致燃烧不稳定性以声学模式或ITA模式为主。将实验结果与低阶声网络模型（LOM）相结合，研究了多火焰相互作用下声不稳定性和ITA不稳定性之间的过渡和竞争。对燃烧系统特征频率和生长速率的LOM预测可以准确地描述声模和ITA模的发生趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.