多管燃烧室氢燃料效应的三维分析

IF 5.2 2区 工程技术 Q2 ENERGY & FUELS
Shuzhi Zhang , Vansh Sharma , Venkat Raman , Tristan T. Shahin , Alexander J. Hodge , Rohan M. Gejji , Robert P. Lucht , Carson D. Slabaugh
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引用次数: 0

摘要

采用高保真仿真方法分析了氢燃料下多管微混合器(MTM)燃烧室内火焰的混合和稳定特性。在这种流动结构中,一束管道将燃料-空气混合物送入燃烧室,导致多个火焰前缘,这些火焰前缘可能以不稳定的方式相互作用。高分辨率的模拟启用自适应网格细化与详细的动力学使用。首先用甲烷-氢混合燃料和纯氢燃料的实验数据对结果进行了验证,结果与实验图像数据吻合良好。对氢气情况的详细分析表明,全球火焰结构在不同的流中显示出不同的形状。上游射流的相互作用引起了沿管道的混合分层,这种分层被主室中几何诱导的流动应变放大。这些成分和流体瞬态导致不同强度的不稳定剪切层反应,促进火焰袋和燃料丝的反复形成。虽然在管道出口处有明显的瞬态流动效应,但在中心管道处观察到一个拉长的主反应区,在相邻管道相距较远的横向上,反应区宽约30%。此外,流线和速度颤振图突出了近壁管的主要火焰反应区与热量释放相互作用的流动不对称性,而中心区域保持主要均匀的流动,从而在相邻火焰振荡期间安全锚定火焰。该研究强调,集体火焰动力学,而不是孤立的局部行为,是实现这种管状束式燃烧器稳定运行的关键。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-dimensional analysis of hydrogen fuel effects in multi-tube combustor
Flame characteristics, including mixing and stabilization in a multi-tube micromixer (MTM) combustor operating with hydrogen fuel are analyzed using high-fidelity simulations. In this flow configuration, a bundle of tubes issue fuel-air mixture into a combustion chamber, leading to multiple flame fronts, which may interact in an unsteady manner. Highly-resolved simulations enabled by adaptive mesh refinement with detailed kinetics are used. The results are first validated against experimental data for both a methane–hydrogen blend and pure hydrogen fuel, showing very good agreement with experimental image data. A detailed analysis of the hydrogen case reveals that global flame structures display distinct shapes across various flow streams. Upstream jet interactions induce mixture stratification along the tubes that is amplified with geometry-induced flow strain in the main chamber. These composition and fluid transients result in unsteady shear layer reactions of varying intensities that promote the recurrent formation of flame pockets and fuel filaments. Although transient flow effects are pronounced near the tube exit, an elongated primary reaction zone is observed for the central tube, the reaction zone being approximately 30% wider in the transverse direction where neighboring tubes are further apart. In addition, streamlines and velocity quiver plots highlight flow asymmetries that interact with heat release in primary flame reaction zones for near-wall tubes, while the central region maintains a predominantly uniform flow, resulting in securely anchored flames during adjacent flame oscillations. The study emphasizes that collective flame dynamics, rather than isolated local behavior, is key to achieving stable operation in such tubular bundled burners.
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来源期刊
Proceedings of the Combustion Institute
Proceedings of the Combustion Institute 工程技术-工程:化工
CiteScore
7.00
自引率
0.00%
发文量
420
审稿时长
3.0 months
期刊介绍: The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review. Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.
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