On revised mixture fraction describing multi-stream mixing

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-05-10 DOI:10.1016/j.combustflame.2025.114225

Ziqi Wang, Weijie Zhang, Hai Huang, Jinhua Wang, Zuohua Huang

引用次数: 0

Abstract

Multi-stream mixing is common in practice but cannot be modeled using the traditional Bilger mixture fraction defined for only two streams. This work was intended to define the multi-stream mixture fractions that can be adopted in flamelet-tabulated combustion models to simulate the multi-stream mixing and combustion. These mixture fractions are expressed as linear combinations of species mass fractions like the Bilger mixture fraction. The present definition is special as the new mixture fractions are nonconservative and can include the preferential diffusion (PD) effects which were often ignored before. Meanwhile, it can be appliable for any number of inlet streams. The multi-stream mixture fractions are derived based on some basic conserved scalars, like the element mass fractions, enthalpy, and transported scalars. Governing equations for the multi-stream mixture fractions are also presented.

查看原文本刊更多论文

描述多流混合的修正混合分数

多流混合在实践中很常见，但不能使用传统的仅为两流定义的较大混合分数来建模。本工作旨在定义可用于火焰表燃烧模型的多流混合馏分，以模拟多流混合和燃烧。这些混合分数表示为物种质量分数的线性组合，如Bilger混合分数。由于新的混合分数是非保守的，并且可以包括以前经常被忽略的优先扩散（PD）效应，因此本定义是特殊的。同时，它可以适用于任何数量的进口流。多流混合分数是基于一些基本的守恒标量，如元素质量分数、焓和输运标量推导出来的。给出了多流混合馏分的控制方程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.