Investigation on enhancement of the combustion flame speed and stability of ammonia-air mixture using nanosecond surface dielectric barrier discharge (nSDBD)

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-08-29 DOI:10.1016/j.combustflame.2025.114432

Yong Hu, Weixin Rong, Zhencao Zheng, Ruijiao Cao, Feiyang Zhao, Wenbin Yu

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Abstract

Ammonia is a carbon-free and hydrogen carrier renewable fuel, but its ignition difficulties and low flame propagation speed limit its application in engines. The aim of this study is to utilize plasma derived by nanosecond pulse surface dielectric barrier discharge (nSDBD) to achieve ammonia ignition under high ambient pressure with enhanced combustion performance. The ignition and combustion characteristics of ammonia-air mixtures within the pressure range of 1 to 20 bar and equivalence ratio range of 0.8 to 1.3 are investigated in a constant-volume combustor. The experimental results demonstrate that the buoyancy effect significantly affects the combustion stability of ammonia. When the flame radius reaches 12 mm, the Froude number (Fr₁₂) is used to evaluate the buoyancy effect, and combustion stability gets deteriorated as Fr₁₂ decreases. Employing nSDBD to generate multiple ignition nuclei is proven to increase the flame propagation speed of ammonia combustion, corresponding with enhanced Fr₁₂ value to smooth the combustion instability. Thereby, plasma modulated by nSDBD will be served as a promising combustion improver to overcome engine high pressure combustion bottleneck.

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纳秒表面介质阻挡放电（nSDBD）增强氨-空气混合物燃烧火焰速度和稳定性的研究

氨是一种无碳、载氢的可再生燃料，但其点火困难、火焰传播速度慢等缺点限制了其在发动机上的应用。本研究的目的是利用纳秒脉冲表面介质阻挡放电（nSDBD）产生的等离子体在高环境压力下实现氨点火，并提高燃烧性能。在定容燃烧室中，研究了压力为1 ~ 20bar，当量比为0.8 ~ 1.3的氨气混合气的点火和燃烧特性。实验结果表明，浮力效应对氨的燃烧稳定性有显著影响。当火焰半径达到12mm时，用弗鲁德数（Fr12）来评价浮力效果，随着Fr12的减小，燃烧稳定性变差。采用nSDBD产生多个点火核可以提高氨燃烧的火焰传播速度，从而提高Fr12值以平滑燃烧不稳定性。由此可见，通过非固态等离子体调制的等离子体将成为克服发动机高压燃烧瓶颈的一种很有前途的燃烧改进剂。

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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.