湍流预混火焰局部拓扑的拉伸率和位移速度统计

IF 2.4 3区 工程技术 Q3 MECHANICS
Hassan Farooq Ahmed, Daniya Zhumabayeva, Shrey Trivedi, Robert Stewart Cant
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引用次数: 0

摘要

利用湍流预混火焰的直接数值模拟数据,分析了在定义局部拓扑的临界点附近的位移速度和火焰拉伸。该分析将本地拓扑类型分为;反应物袋,隧道封闭,隧道形成,和产物袋。讨论了局部拓扑结构对火焰全局传播的影响。圆柱形拓扑结构对火焰伸展既有正向作用,也有负向作用,而球形拓扑结构主要引起火焰区域的局部破坏。对于所有拓扑结构,拉伸率都遵循曲率轮廓。另一方面,位移速度被认为是衡量曲率的影响,而两者共同决定了面积是产生还是破坏。局部扩散对位移速度的影响和曲率对拉伸率分布的影响是局部面积变化的主要因素。这些局部变化会影响整个表面面积,从而影响火焰的全局传播。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stretch Rate and Displacement Speed Statistics for Local Flame Topology in Turbulent Premixed Flames

Displacement speed and flame stretch are analysed in the vicinity of critical points defining local topology using a direct numerical simulation dataset of a turbulent premixed flame. The analysis categorises local topology types as; reactant pocket, tunnel closure, tunnel formation, and product pocket. The influence of local topology on global flame propagation is discussed. Cylindrical topologies are shown to contribute both positively and negatively towards flame stretch while spherical topologies mainly cause local destruction of flame area. The rate of stretch is shown to follow the curvature profile for all topologies. On the other hand, displacement speed is seen to scale the influence of curvature, while together the two determine whether area is produced or destroyed. The role of local diffusion in displacement speed and the role of curvature in defining the stretch rate profile emerge as the main actors for the local change in area. These local changes are shown to impact the global surface area and consequently the global propagation of the flame.

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来源期刊
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion 工程技术-力学
CiteScore
5.70
自引率
8.30%
发文量
72
审稿时长
2 months
期刊介绍: Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.
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