Effect of colored noise on precursors of thermoacoustic instability in model gas turbine combustors

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-23 DOI:10.1177/17568277241262168

Neha Vishnoi, Vikrant Gupta, Aditya Saurabh, Lipika Kabiraj

引用次数: 0

Abstract

In this work, we numerically investigate the dynamics of a prototypical thermoacoustic system, the generalized Van der Pol oscillator, in the presence of additive noise of varying color (correlation time) and intensity while the system undergoes supercritical and subcritical Hopf bifurcation. We specifically investigate the influence of noise color on trends in the coherence factor and the Hurst exponent in the subthreshold region to assess their reliability as instability precursors. The Hurst exponent is found reliable only for correlation times much larger than the time scale of the instability while the coherence factor is found to be reliable for the entire range of noise color investigated. These inferences are found to hold for both supercritical and subcritical bifurcation cases.

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有色噪声对模型燃气轮机燃烧器热声不稳定性前兆的影响

在这项工作中，我们用数值方法研究了一个原型热声系统--广义范德波尔振荡器--在不同颜色（相关时间）和强度的加性噪声存在时的动力学，同时该系统经历了超临界和亚临界霍普夫分岔。我们特别研究了噪声颜色对亚阈值区相干系数和赫斯特指数趋势的影响，以评估它们作为不稳定前兆的可靠性。结果发现，只有相关时间远大于不稳定性时间尺度时，赫斯特指数才是可靠的，而在所研究的整个噪声颜色范围内，相干系数都是可靠的。这些推论在超临界和亚临界分岔情况下都是成立的。

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.