An experimental and modeling study of hydrogen/n-decane blends

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2024-10-23 DOI:10.1016/j.combustflame.2024.113792

Shangkun Zhou , A. Abd El-Sabor Mohamed , Shashank S. Nagaraja , Pengzhi Wang , Yuki Murakami , Jiaxin Liu , Peter K. Senecal , Henry J. Curran

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Abstract

In this study, a new mechanism is developed to simulate hydrogen/n-decane blends. It is validated in the temperature range 650–1500 K, at p = 30 bar, for equivalence ratios of 0.5, 1.0, and 2.0 in ‘air’ for 99/1, 95/5 and 80/20 (mol%) blends of hydrogen/n-decane using ignition delay time (IDT) data recorded in both an RCM and in a shock tube. Additionally, the mechanism's performance is assessed against existing literature data for both pure hydrogen and pure n-decane, demonstrating overall satisfactory agreement compared to the experimental measurements.

This study also explores the effects of n-decane addition to hydrogen at different temperatures (600 K, 900 K, and 1500 K) at p = 30 bar pressure for a stoichiometric mixture (φ = 1.0). At 600 K, where pure hydrogen fails to ignite, the introduction of 1% n-decane initiates ignition, albeit with considerably extended IDTs. At 900 K, the addition of 1% n-decane enhances reactivity, while at 1500 K, it diminishes reactivity and extends the IDT. The underlying reasons for these observed effects are reported.

We provide valuable insights into the reactivity of dual fuel mixtures of hydrogen and n-decane encompassing low (600–800 K), intermediate (800–1200 K), and high (> 1200 K) temperature ranges. At low and intermediate temperatures, the inclusion of n-decane enhances reactivity. Consequently, for application in practical road transport combustion systems, the use of n-decane or extended-chain n-alkanes is recommended as suitable pilot fuels. Conversely, at high-temperature combustion conditions, the utilization of pilot fuels composed of linear alkanes is observed to impede reactivity.

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氢气/癸烷混合物的实验和模型研究

本研究开发了一种新的机制来模拟氢气/正癸烷混合物。利用在 RCM 和冲击管中记录的点火延迟时间 (IDT) 数据，在 650-1500K、p = 30 巴的温度范围内，对 "空气 "中等效比为 0.5、1.0 和 2.0 的 99/1、95/5 和 80/20 (mol%) 的氢/正癸烷混合物进行了验证。本研究还探讨了在不同温度（600 K、900 K 和 1500 K）、p = 30 bar 压力下，对于化学计量混合物（φ = 1.0），氢气中加入正癸烷的影响。在 600 K 时，纯氢无法点燃，而加入 1%的正癸烷后可以点燃，尽管 IDT 明显延长。在开氏 900 度时，加入 1%的正癸烷会提高反应性，而在开氏 1500 度时，正癸烷会降低反应性并延长 IDT。我们对氢气和正癸烷双燃料混合物在低温（600-800 K）、中温（800-1200 K）和高温（> 1200 K）范围内的反应性提供了宝贵的见解。在低温和中温条件下，正癸烷的加入会提高反应活性。因此，在实际道路运输燃烧系统中，建议使用正癸烷或加长链正构烷烃作为合适的先导燃料。相反，在高温燃烧条件下，使用由线性烷烃组成的先导燃料会阻碍反应性。

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.