{"title":"Control authority over a combustion instability investigated in CFD","authors":"R. Müller, J. Hermann, W. Polifke","doi":"10.1177/1756827715627071","DOIUrl":null,"url":null,"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.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2016-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1756827715627071","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1177/1756827715627071","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.
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