Numerical study on the impact of Nanosecond Repetitively Pulsed discharges on the lean blowout limit for a hydrogen/air swirled flame

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-04-17 DOI:10.1016/j.combustflame.2025.114149

Boris Kruljevic, Stéphane Q.E. Wang, Nicolas Vaysse, Jean-Baptiste Perrin-Terrin, Daniel Durox, Antoine Renaud, Christophe O. Laux, Benoît Fiorina

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Abstract

Plasma-assisted combustion (PAC) using Nanosecond Repetitively Pulsed (NRP) discharges is an efficient method to extend the lean blowout limit of flames, as shown in numerous experiments. In this study, the underlying mechanisms by which NRP discharges extend the lean blowout limit in hydrogen-air flames are analyzed numerically for the first time. The computations are performed using Large Eddy Simulations (LES) coupled with a semi-empirical model for the NRP discharges. The blowout is triggered at constant hydrogen mass flow rate (i.e., constant flame thermal power) through a very slow increase of the injected air mass flow rate, resulting in a decrease of the global equivalence ratio. A PAC configuration featuring NRP discharges at a frequency of 15 kHz and a 1.5 mJ deposited energy per pulse is computed, for which the experiments have shown a 20% reduction of the lean blowout equivalence ratio, by using NRP discharges. The case without plasma is also computed. These two configurations are first compared in terms of combustion efficiency. Next, results of blowout simulations are presented. The LES is able to predict the blowout equivalence ratios accurately for both the case without plasma (0.9% error) and with the NRP discharges (2.8% error). In the case without plasma, blowout is triggered through the dilution of burnt gases by fresh gases, which penetrated the inner recirculation zone at sufficiently low global equivalence ratios. Plasma triggers the oxidation of these pockets of fresh gases, resulting in the production of radicals and heat, which stabilizes the flame.

Novelty and Significance Statement

This is the first time that simulations are performed of a plasma-assisted combustion (PAC) experiment in pure hydrogen flames. Also, for the first time, a PAC phenomenological model (Castela et al., 2016) is used to predict the lean blowout (LBO) limit of a flame assisted by plasma and the results are evaluated through comparisons with experimental data. The interactions between the flame and the Nanosecond Repetitively Pulsed (NRP) discharges at the LBO limit are studied numerically. The NRP discharges promote the oxidation of pockets of fresh gases, resulting in the production of radicals and heat, which stabilizes the flame and extends the LBO limit.

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纳秒重复脉冲放电对氢/空气旋转火焰稀薄喷爆极限影响的数值研究

大量实验表明，利用纳秒重复脉冲（NRP）放电的等离子体辅助燃烧（PAC）是一种有效的延长火焰稀薄爆裂极限的方法。在这项研究中，NRP排放的潜在机制，延长了稀薄井喷极限的氢-空气火焰首次进行了数值分析。利用大涡模拟（LES）和半经验模型对NRP放电进行了计算。在恒定的氢气质量流量（即恒定的火焰热功率）下，通过非常缓慢地增加喷射空气质量流量触发井喷，导致整体等效比减小。计算了频率为15 kHz的NRP放电和每脉冲1.5 mJ沉积能量的PAC配置，实验表明，使用NRP放电可使稀喷等效比降低20%。没有等离子体的情况也进行了计算。这两种结构首先在燃烧效率方面进行比较。其次，给出了井喷模拟的结果。在无等离子体放电（误差0.9%）和NRP放电（误差2.8%）的情况下，LES都能准确预测井喷等效比。在没有等离子体的情况下，井喷是通过新鲜气体稀释燃烧气体而触发的，新鲜气体以足够低的全球等效比穿透内部再循环区。等离子体触发这些新鲜气体的氧化，导致自由基和热量的产生，从而稳定火焰。新颖性和意义声明这是首次在纯氢火焰中进行等离子体辅助燃烧（PAC）实验的模拟。此外，首次使用PAC现象学模型（Castela et al., 2016）来预测等离子体辅助火焰的稀爆（LBO）极限，并通过与实验数据的比较对结果进行了评估。数值研究了火焰与LBO极限纳秒重复脉冲（NRP）放电的相互作用。NRP放电促进了新鲜气体的氧化，导致自由基和热量的产生，从而稳定了火焰并延长了LBO极限。

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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.