Penghua Qiu, Cheng Lu, Linyao Zhang, Chang Xing, Zhen Cao, Li Liu, Jiangbo Peng and Xin Yu
{"title":"Extraction of turbulent flame structures and dynamic modes with corrected OH-PLIF images for a hydrogen micromix burner","authors":"Penghua Qiu, Cheng Lu, Linyao Zhang, Chang Xing, Zhen Cao, Li Liu, Jiangbo Peng and Xin Yu","doi":"10.1039/D4SE00023D","DOIUrl":null,"url":null,"abstract":"<p >The combination of micromix and diluted combustion technologies is an effective way to realize stable H<small><sub>2</sub></small> flames with low NO<small><sub><em>x</em></sub></small> emission, and the dynamic modes and turbulent flame structures with corrected OH-PLIF (1 kHz) images for a hydrogen micromix burner were experimentally studied in this work under different steam dilution ratios (<em>D</em>) and equivalence ratios (<em>φ</em>). Two types of flames, anchored and lifted, are found for different inlet conditions (dilution ratios (<em>D</em>) and equivalence ratios (<em>φ</em>)). When the flame tends to lift, the flame shape and location of the peak OH signal have obvious change over time and the results show that the flame stability reduces. Besides, the flame surface density (FSD) has small values distributed around the flame root, making the flame more unstable. When the flame is lifted, the distribution of FSD becomes wider (not mainly in the shear layer zone (SLZ)) and a large part of FSD is distributed in the flame root. In general, dynamic mode decomposition (DMD) analysis results show that the anchored flame has a lower flame frequency than that of the lifted flame in the same mode.</p>","PeriodicalId":104,"journal":{"name":"Sustainable Energy & Fuels","volume":null,"pages":null},"PeriodicalIF":5.0000,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sustainable Energy & Fuels","FirstCategoryId":"88","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/se/d4se00023d","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The combination of micromix and diluted combustion technologies is an effective way to realize stable H2 flames with low NOx emission, and the dynamic modes and turbulent flame structures with corrected OH-PLIF (1 kHz) images for a hydrogen micromix burner were experimentally studied in this work under different steam dilution ratios (D) and equivalence ratios (φ). Two types of flames, anchored and lifted, are found for different inlet conditions (dilution ratios (D) and equivalence ratios (φ)). When the flame tends to lift, the flame shape and location of the peak OH signal have obvious change over time and the results show that the flame stability reduces. Besides, the flame surface density (FSD) has small values distributed around the flame root, making the flame more unstable. When the flame is lifted, the distribution of FSD becomes wider (not mainly in the shear layer zone (SLZ)) and a large part of FSD is distributed in the flame root. In general, dynamic mode decomposition (DMD) analysis results show that the anchored flame has a lower flame frequency than that of the lifted flame in the same mode.
期刊介绍:
Sustainable Energy & Fuels will publish research that contributes to the development of sustainable energy technologies with a particular emphasis on new and next-generation technologies.