Strong and weak interactions of a V-shaped premixed swirling flame with outer vortex rings

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-10-08 DOI:10.1016/j.combustflame.2024.113760

Yongzhi Ren, Qiuxiao Wang, Yuqian Peng, Liangliang Xu, Xi Xia, Fei Qi

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Abstract

This paper reports two distinct vortex-flame interaction mechanisms existing in a self-excited V-shaped premixed flame. Time-resolved simultaneous measurements of particle image velocimetry (PIV) and OH* chemiluminescence are employed to capture the mean and coherent flow and flame structures. The qualitative study demonstrates the importance of the outer vortex rings (OVR) in governing the flame front dynamics of two representative lean and near-stoichiometric cases. The interaction of the flame with the OVRs is further analyzed quantitatively during one OVR's entire lifespan. Results suggest that the vortex-flame interaction in the lean case is a weak one as the response of the flame's HRR to OVR's growth is interrupted by the tip extinction. This can be understood as a response to the flow perturbation excited in the Helmholtz mode of the plenum. However, the near-stoichiometric case yields a strong interaction that the peak HRR is synchronized with the OVR's peak circulation, which could contribute to a stronger thermoacoustic coupling that leads to the stronger pressure oscillation and frequency drift away from the Helmholtz mode.

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带有外涡旋环的 V 形预混合漩涡火焰的强相互作用和弱相互作用

本文报告了自激 V 形预混合火焰中存在的两种不同的涡流-火焰相互作用机制。采用粒子图像测速仪（PIV）和 OH* 化学发光的时间分辨同步测量来捕捉平均和相干的流动和火焰结构。定性研究证明了外涡环（OVR）在控制两种具有代表性的贫油和近碳计量情况下的火焰前沿动态方面的重要性。研究还进一步定量分析了在一个外涡环的整个生命周期中火焰与外涡环的相互作用。结果表明，在贫化情况下，涡流与火焰的相互作用是微弱的，因为火焰的 HRR 对 OVR 增长的响应被尖端熄灭所打断。这可以理解为是对在全腔亥姆霍兹模式下激发的流动扰动的响应。然而，在接近化学计量的情况下，HRR 的峰值与 OVR 的循环峰值同步，这可能会产生更强的热声耦合，导致更强的压力振荡和频率偏离 Helmholtz 模式。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.