{"title":"Combustion Regimes of Low Stretched Premixed Methane–Hydrogen–Air Mixtures near Flammability Limits","authors":"A. S. Demin, S. N. Mokrin","doi":"10.1134/S106287382471050X","DOIUrl":null,"url":null,"abstract":"<p>The experimental study of counterflow premixed low-stretched flames stabilized in a flat channel is described in the paper. A premixed methane-air mixture was investigated. The effect of the channel gap on the flammability limits was evaluated. It was found that increasing the channel gap expands the flammable region to a lean mixture area. The effect of the hydrogen addition on the flammability limits was also studied as part of the paper. This leads to lower Lewis numbers and various unstable combustion modes such as running waves, moving cells and sporadic flames. Similar modes have been observed previously in microgravity experiments. The obtained combustion modes were classified, and the area of premixed methane-hydrogen-air flames existence was determined. Additionally, the regime diagram for the mixture with hydrogen content of 50% by volume in the fuel was plotted as a results of this study.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S489 - S494"},"PeriodicalIF":0.4800,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Russian Academy of Sciences: Physics","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S106287382471050X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
Abstract
The experimental study of counterflow premixed low-stretched flames stabilized in a flat channel is described in the paper. A premixed methane-air mixture was investigated. The effect of the channel gap on the flammability limits was evaluated. It was found that increasing the channel gap expands the flammable region to a lean mixture area. The effect of the hydrogen addition on the flammability limits was also studied as part of the paper. This leads to lower Lewis numbers and various unstable combustion modes such as running waves, moving cells and sporadic flames. Similar modes have been observed previously in microgravity experiments. The obtained combustion modes were classified, and the area of premixed methane-hydrogen-air flames existence was determined. Additionally, the regime diagram for the mixture with hydrogen content of 50% by volume in the fuel was plotted as a results of this study.
期刊介绍：
Bulletin of the Russian Academy of Sciences: Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It presents full-text articles (regular, letters to the editor, reviews) with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. Bulletin of the Russian Academy of Sciences: Physics focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied. Manuscripts can be submitted in Russian and English languages and are subject to peer review. Accepted articles are usually combined in thematic issues on certain topics according to the journal editorial policy. Authors featured in the journal represent renowned scientific laboratories and institutes from different countries, including large international collaborations. There are globally recognized researchers among the authors: Nobel laureates and recipients of other awards, and members of national academies of sciences and international scientific societies.
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