Theoretical investigation of dual flame coupling in the centrally-staged combustor

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-08-11 DOI:10.1016/j.combustflame.2025.114391

Ziyu Qin , Yuzhen Lin , Xiao Han

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引用次数: 0

Abstract

The communication theoretically investigates the coupling between the pilot and main stage flames, which is an essential issue in the centrally-staged combustor. First, an explicit solution to the mixture fraction equation is formulated, followed by a disturbance analysis to this basic solution. The mixture fraction response to the small bulk flow disturbance is derived. The corresponding linearized transfer function is then defined. Further, the flame sensitivity and coupling-induced oscillation suppression and enhancement are quantified. Finally, a dimensionless number is proposed to distinguish the strong and weak flame coupling based on the fuel transport.

Novelty and significance statement

We demonstrate a novel method to quantify the dual flame coupling characteristics and distinguish the strong and weak coupling effects. The analytical formulation visualizes the coupling intuitively. This conceptual investigation is of practical significance because it is helpful in understanding the dual-flame and multi-flame combustion systems, such as the centrally-staged stratificated flame and mesoscale hydrogen array flame.

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中央分级燃烧室双火焰耦合的理论研究

通信从理论上研究了主级与先导级火焰之间的耦合，这是中心级燃烧室的一个重要问题。首先，给出了混合分数方程的显式解，然后对该基本解进行了扰动分析。推导了混合分数对小体积流动扰动的响应。然后定义相应的线性化传递函数。进一步，对火焰敏感性和耦合振荡抑制与增强进行了量化。最后，提出了基于燃料输运的火焰强耦合和弱耦合的无量纲数。我们提出了一种量化双火焰耦合特性和区分强耦合效应和弱耦合效应的新方法。解析公式直观地显示了耦合。这一概念研究有助于理解双火焰和多火焰燃烧系统，如中心阶段分层火焰和中尺度氢阵列火焰，具有实际意义。

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

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.