Similarity in laminar burning velocity and scaling of turbulent flame speed of real fuel/air expanding flames: RP-3 kerosene with complex compositions

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-05-03 DOI:10.1016/j.combustflame.2025.114209

Linyuan Huang , Sheng Huang , Xinke Wang , Xiaomeng Zhao , Hui Li , Quan Zhu

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引用次数: 0

Abstract

In this study, we analyzed the similarity in the laminar burning velocity of RP-3 kerosene with different components and proposed the scaling of the turbulent flame speed for RP-3 kerosene/air premixed expanding flames. The laminar/turbulent flame propagation characteristics of the RP-3 kerosene/air mixture were measured using a constant volume combustion bomb. The results revealed that despite significant differences in the chemical composition of six RP-3 kerosene samples, their laminar burning velocities exhibited minimal variation under the same conditions. This was attributed to the inherent complexity of real fuels, which makes them less sensitive to the properties of any of their single components. Also, it was also confirmed that this low sensitivity became more pronounced when there were eight or more components in the fuel mixture. Moreover, it was found that the average molecular weights of the small pyrolysis fragments decomposed in the preheating zone were comparable between RP-3 kerosene and some hydrocarbon fuels with large molecular weights (e.g. C4-C8 n-alkanes, iso-octane, iso-cetane, n-decane and decalin). Consequently, they exhibited analogous thermal-diffusional effects. Based on this, it was also found that these fuels had similar normalized turbulent flame speeds under the scaling of the correlation of

(d 〈 r 〉 / d t) / (σ S_{L}) = A R e_{T, f}^{1 / 2}

, and the coefficient (

A

) had a pronounced nonlinear relationship with the Markstein number (

M a

). Finally, a unified correlation for turbulent flame speed considering the thermal-diffusional effect (

(d 〈 r 〉 / d t) / (σ S_{L}) = (0.0664 e^{- M a / 2} + 0.0803) R e_{T, f}^{1 / 2}

) based on the Markstein number was proposed, which could describe not only the present experimental data, but also turbulent flame speeds from literature for other fuels under wide conditions.

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真实燃料/空气膨胀火焰层流燃烧速度的相似性和湍流火焰速度的标度：复杂成分RP-3煤油

本研究分析了不同成分的RP-3煤油层流燃烧速度的相似性，提出了RP-3煤油/空气预混膨胀火焰湍流火焰速度的标度。采用定容燃烧弹测量了RP-3煤油/空气混合气的层流/湍流火焰传播特性。结果表明，尽管6种RP-3煤油样品的化学成分存在显著差异，但在相同条件下，它们的层流燃烧速度变化最小。这归因于真实燃料固有的复杂性，这使得它们对任何单一成分的特性都不太敏感。此外，还证实，当燃料混合物中有八种或更多成分时，这种低灵敏度变得更加明显。此外，还发现RP-3煤油在预热区分解的小裂解碎片的平均分子量与一些分子量较大的碳氢燃料（如C4-C8正构烷烃、异辛烷、异十六烷、正癸烷和十烷）相当。因此，它们表现出类似的热扩散效应。在此基础上还发现，在(d < r > /dt)/(σSL)=AReT，f1/2的相关标度下，这些燃料具有相似的归一化湍流火焰速度，且系数(A)与Markstein数（Ma）具有明显的非线性关系。最后，提出了考虑热扩散效应((d < r > /dt)/(σSL)=(0.0664e−Ma/2+0.0803)ReT,f1/2)的基于Markstein数的湍流火焰速度统一关系式，该关系式不仅可以描述当前实验数据，也可以描述文献中其他燃料在广泛条件下的湍流火焰速度。

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.