Mechanism Analysis of Turbulent Heat Transfer in Porous Coking of Hydrocarbon Fuels under Supercritical Pressure

IF 3.8 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2024-09-19 DOI:10.1021/acs.iecr.4c01840

Mingyin Zhu, Huaizhi Han, Zhongxiu Xu

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Abstract

The effect of carbon deposits based on the porous properties in aero-engine cooling channels on turbulent heat transfer is numerically studied. As such, a CFD coupling model combining fuel pyrolysis and porous media model is established. The comparison results between the porous and solid coking that porous coking has a higher heat transfer efficiency than solid coking. At δ_c = 60 μm, the total heat transfer coefficient (THTC) of porous coking is 98 W m^–2 K^–1 higher than that of solid coking. Considering the effect of porosity on porous coking, it could be seen that the THTC of porous coking first increases and then decreases with the increase of porosity. The critical porosity finds around 39.0%. Finally, the influence of spatial inhomogeneity of coking morphology is studied. It was indicated that the THTC for porous coking with inhomogeneous porosity is higher than the arithmetic mean of the homogeneous porosity. Inhomogeneity porosity porous coking with 6 and 72% porosity is 39 W m^–2 K^–1 higher than the arithmetic mean of homogeneous porosity.

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超临界压力下碳氢化合物燃料多孔焦化中的湍流传热机理分析

数值研究了基于多孔特性的碳沉积物在航空发动机冷却通道中对湍流传热的影响。因此，建立了一个结合燃料热解和多孔介质模型的 CFD 耦合模型。多孔焦化与固体焦化的比较结果表明，多孔焦化的传热效率高于固体焦化。当 δc = 60 μm 时，多孔焦化的总传热系数比固体焦化高 98 W m-2 K-1。考虑到孔隙率对多孔焦化的影响，可以看出多孔焦化的总传热系数随着孔隙率的增加先增大后减小。临界孔隙率约为 39.0%。最后，研究了焦化形态空间不均匀性的影响。结果表明，不均匀孔隙率多孔焦化的 THTC 要高于均匀孔隙率的算术平均值。孔隙率分别为 6% 和 72% 的不均匀孔隙率多孔焦化的 THTC 比均匀孔隙率的算术平均值高 39 W m-2 K-1。

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

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.

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