Control authority over a combustion instability investigated in CFD

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2016-03-01 DOI:10.1177/1756827715627071

R. Müller, J. Hermann, W. Polifke

引用次数: 3

Abstract

Control authority is investigated for active damping of a combustion instability by modulation of the fuel flow. Two combustors, operating as quarter-wave thermo-acoustic oscillators, are modelled in ANSYS CFX. In experiments, active damping was applied successfully on one of these, but was not effective on the other. Active instability control is implemented in the model analogous to experiment. The goal of this research is to explain why the same implementation of active instability control, using the same controller, would be effective on one combustor geometry, but not on the other. Turbulent combustion is modelled by SAS-SST and the burning velocity model. The distribution of the convective time between fuel injector and flame is evaluated and used to estimate the response of the heat release to modulation of the fuel mass flow. The results can be used to predict the feasibility of this kind of active control.

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燃烧不稳定性控制权限的CFD研究

研究了通过调节燃油流量来主动抑制燃烧不稳定性的控制权限。在ANSYS CFX中对两种工作为四分之一波热声振荡器的燃烧室进行了建模。在实验中，主动阻尼成功地应用于其中一个，但对另一个无效。在模拟实验的模型中实现了主动不稳定性控制。本研究的目的是解释为什么使用相同的控制器实现的主动不稳定性控制在一个燃烧室几何形状上有效，而在另一个燃烧室几何形状上无效。紊流燃烧模型采用SAS-SST和燃烧速度模型。计算了喷油器与火焰之间的对流时间分布，并利用该分布估计了喷油器放热对燃油质量流量调节的响应。研究结果可用于预测这种主动控制的可行性。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.