技术说明：将全谱相关k分布查找表扩展到CH4和NH3，用于燃烧建模

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-02-19 DOI:10.1016/j.icheatmasstransfer.2025.108752

Xin Wang , Zheqi Xu , Hongyuan Di , Chaojun Wang

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引用次数: 0

摘要

由于可靠的精度和计算效率，全谱相关k分布（FSCK）查找表（传统FSCK表的简称）不断得到普及；然而，它们只适用于燃烧产物和中间体，如CO2、H2O、CO和煤烟。气体燃料，即CH4、NH3或它们的混合物，也显示出复杂的光谱或跨光谱的“非灰色”行为。虽然这些气体燃料通常在燃烧过程中被消耗，但它们的光谱行为可能会影响点火、火焰蔓延和化学反应。因此，有必要在FSCK查找表中同时包含CH4和NH3的光谱性质。为了实现这一点，在本工作中构建了一个单独的FSCK查找表（扩展FSCK表的简称），仅包括CH4和NH3。然后使用乘法混合方案混合来自传统FSCK表和来自扩展FSCK表的k-分布。通过一个真实的非预混火焰，验证了扩展FSCK表和乘法混合方案的效率和准确性。结果表明，燃烧过程中对CH4和NH3的吸收较强，不容忽视。结果还表明，将CH4和NH3的光谱性质处理为灰色会带来明显的误差。

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Technical note: Extension of full-spectrum correlated k-distribution look-up tables to CH4 and NH3 for use in combustion modelling

Due to reliable accuracy and computational efficiency, full-spectrum correlated k-distribution (FSCK) look-up tables (short for traditional FSCK tables) have continuously gained popularities; however, they are only valid for combustion products and intermediates, such as CO₂, H₂O, CO and soot. Gas fuels, i.e., CH₄, NH₃ or their mixture, also display complex spectral or ‘nongray’ behaviors across spectrum. While those gas fuels are commonly consumed during combustion, their spectral behaviors may affect ignition, flame spread and chemical reactions. Therefore, it is necessary to include spectral properties of both CH₄ and NH₃ into FSCK look-up tables. To achieve this, a separate FSCK look-up tables (short for extended FSCK tables) including only CH₄ and NH₃ is constructed in this work. The multiplicative mixing scheme is then used to mix k-distributions from traditional FSCK tables and those from extended FSCK tables. A realistic non-premixed flame is used to validate both efficiency and accuracy of extended FSCK tables as well as multiplicative mixing scheme. Results show that absorption from CH₄ and NH₃ during combustion is strong and cannot be ignored. Results also show that treating spectral properties of CH₄ and NH₃ to be gray may bring in significant errors.

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.