Multiple Mapping Conditioning Mixing Time Scales for Turbulent Premixed Flames

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2022-10-21 DOI:10.1007/s10494-022-00375-1

Nadezhda Iaroslavtceva, Andreas Kronenburg, Oliver T. Stein

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引用次数: 1

Abstract

A novel multiple mapping conditioning (MMC) mixing time scale model for turbulent premixed combustion has been developed. It combines time scales for the flamelet and distributed flame regimes with the aid of a blending function. The blending function serves two purposes. Firstly, it helps to identify zones where the premixed flame resides and where the time scale associated with the premixed flame shall be used. Secondly, it uses the Karlovitz number to identify the turbulent premixed combustion regime and to reduce the weighting of the premixed flame time scale if Karlovitz numbers are high and deviations from the flamelet regime are expected. A series of three-dimensional direct numerical simulations (DNS) of statistically one dimensional, freely propagating turbulent methane-air flames provides a wide range of turbulent combustion regimes for the mixing model validation. The new mixing time scale provides correct predictions of the flame speed of freely propagating turbulent flames which could not be matched by most recognized mixing models. The turbulent flame structure predicted by the new model is in good agreement with DNS for all combustion regimes from flamelet to the thickened reaction zone.

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湍流预混火焰的多重映射条件混合时间尺度

建立了紊流预混燃烧的多重映射调节(MMC)混合时标模型。它结合了时间尺度的火焰和分布式火焰制度的援助，混合功能。混合函数有两个目的。首先，它有助于确定预混火焰所在的区域，以及使用预混火焰相关的时间尺度。其次，它使用Karlovitz数来识别湍流预混燃烧状态，并在Karlovitz数较高且预计会偏离小火焰状态时减少预混火焰时间尺度的权重。一系列的三维直接数值模拟(DNS)统计一维，自由传播的湍流甲烷-空气火焰提供了广泛的湍流燃烧状态的混合模型验证。新的混合时间尺度对自由传播湍流火焰的火焰速度提供了正确的预测，这是大多数公认的混合模型所不能匹配的。新模型预测的从小火焰到增稠反应区的所有燃烧形式的湍流火焰结构都与DNS很好地吻合。

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

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

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.