Numerical study of a turbulent hydrogen flame in oxy-combustion regimes

IF 1.1 4区工程技术 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Archives of Mechanics Pub Date : 2017-11-04 DOI:10.24423/AOM.2298

A. Wawrzak, A. Tyliszczak

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引用次数: 4

Abstract

This paper presents the results of large eddy simulation/conditional moment closure (LES-CMC) computations of a turbulent flame in oxy-combustion regimes complemented by 0D-CMC analysis. The fuel is pure hydrogen and it issues into a hot oxidiser stream which is a mixture of oxygen and water vapour. The flame is initiated by a spark, then it spreads and propagates through the domain and eventually stabilises as a lifted or attached one. The present problem offers new challenges to combustion modelling as the observed combustion process is strongly unsteady. In cases of large content of oxygen in the oxidiser stream the flame has very high temperature (≈ 3000 K) and large temperature/density variations. Nevertheless, it is shown that LES-CMC simulations are stable in such conditions and can be successfully applied to oxy-combustion studies. We analyse the dependence of the flame temperatures and lift-off height of the flames LH on the oxidiser composition and chemical kinetics. It is shown that both these factors may affect the flame behaviour. We identified the conditions in which LH exhibits a linear dependence on the oxidiser composition independently of applied chemical kinetics, and the regimes where the LH changes in a non-linear manner and strongly depends on the chemical kinetics.

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全氧燃烧条件下湍流氢火焰的数值研究

本文介绍了大涡模拟/条件矩闭(LES-CMC)在全氧燃烧条件下湍流火焰的计算结果，并辅以0D-CMC分析。燃料是纯氢，它进入热氧化剂流，这是氧气和水蒸气的混合物。火焰是由一个火花引起的，然后它在整个领域传播和传播，最终稳定为一个升起或附着的火焰。由于观测到的燃烧过程是强不稳定的，因此对燃烧模拟提出了新的挑战。在氧化剂流中含氧量大的情况下，火焰具有非常高的温度(≈3000 K)和大的温度/密度变化。尽管如此，LES-CMC模拟在这种条件下是稳定的，可以成功地应用于氧燃烧研究。我们分析了火焰温度和火焰LH的上升高度与氧化剂组成和化学动力学的关系。结果表明，这两种因素都可能影响火焰行为。我们确定了LH表现出独立于应用化学动力学的氧化剂组成的线性依赖的条件，以及LH以非线性方式变化并强烈依赖于化学动力学的制度。

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

Archives of Mechanics 工程技术-材料科学：表征与测试

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Archives of Mechanics provides a forum for original research on mechanics of solids, fluids and discrete systems, including the development of mathematical methods for solving mechanical problems. The journal encompasses all aspects of the field, with the emphasis placed on: -mechanics of materials: elasticity, plasticity, time-dependent phenomena, phase transformation, damage, fracture; physical and experimental foundations, micromechanics, thermodynamics, instabilities; -methods and problems in continuum mechanics: general theory and novel applications, thermomechanics, structural analysis, porous media, contact problems; -dynamics of material systems; -fluid flows and interactions with solids. Papers published in the Archives should contain original contributions dealing with theoretical, experimental, or numerical aspects of mechanical problems listed above. The journal publishes also current announcements and information about important scientific events of possible interest to its readers, like conferences, congresses, symposia, work-shops, courses, etc. Occasionally, special issues of the journal may be devoted to publication of all or selected papers presented at international conferences or other scientific meetings. However, all papers intended for such an issue are subjected to the usual reviewing and acceptance procedure.