Cooper Welch, Jannick Erhard, Hao Shi, Andreas Dreizler, Benjamin Böhm
{"title":"火花点火发动机贫氢火焰不稳定性实验研究","authors":"Cooper Welch, Jannick Erhard, Hao Shi, Andreas Dreizler, Benjamin Böhm","doi":"10.1016/j.proci.2024.105391","DOIUrl":null,"url":null,"abstract":"This experimental study explores the pivotal role of thermodiffusive and hydrodynamic instabilities in shaping the early development of lean hydrogen flames within a spark-ignition engine. Utilizing high-speed planar laser-induced fluorescence of inert SO tracer gas, the flame front is visualized to scrutinize the lean H flame propagation in an optically accessible single-cylinder spark-ignition engine operating at 800rpm and intake pressures of 0.4bar and 0.95bar. Comparisons between H/air and CH/air flames reveal minimal disparity in the statistical distributions of flame surface density under identical initial conditions. This suggests that, within the dynamic engine environment, the influences of thermodiffusive and hydrodynamic instabilities may be counteracted by competing factors, including turbulence and dynamic volume confinement. While traditional bomb calorimeter experiments and laminar simulations provide insights into hydrogen flame evolution, their observed effects may be less pronounced in real-world applications where turbulence and flame-wall interactions play a major role. However, by significantly reducing the equivalence ratio, the observed increase in underscores that the cumulative effects of flame instabilities become notable under extremely lean conditions, even within the dynamic engine environment. This study marks a significant step in gaining new insights into the influence of flame instabilities on H-fueled spark-ignition engines. Finally, the elucidation of turbulence and flame-wall interactions in attenuating thermodiffusive instabilities presents a promising avenue for future research.","PeriodicalId":408,"journal":{"name":"Proceedings of the Combustion Institute","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"An experimental investigation of lean hydrogen flame instabilities in spark-ignition engines\",\"authors\":\"Cooper Welch, Jannick Erhard, Hao Shi, Andreas Dreizler, Benjamin Böhm\",\"doi\":\"10.1016/j.proci.2024.105391\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This experimental study explores the pivotal role of thermodiffusive and hydrodynamic instabilities in shaping the early development of lean hydrogen flames within a spark-ignition engine. Utilizing high-speed planar laser-induced fluorescence of inert SO tracer gas, the flame front is visualized to scrutinize the lean H flame propagation in an optically accessible single-cylinder spark-ignition engine operating at 800rpm and intake pressures of 0.4bar and 0.95bar. Comparisons between H/air and CH/air flames reveal minimal disparity in the statistical distributions of flame surface density under identical initial conditions. This suggests that, within the dynamic engine environment, the influences of thermodiffusive and hydrodynamic instabilities may be counteracted by competing factors, including turbulence and dynamic volume confinement. While traditional bomb calorimeter experiments and laminar simulations provide insights into hydrogen flame evolution, their observed effects may be less pronounced in real-world applications where turbulence and flame-wall interactions play a major role. However, by significantly reducing the equivalence ratio, the observed increase in underscores that the cumulative effects of flame instabilities become notable under extremely lean conditions, even within the dynamic engine environment. This study marks a significant step in gaining new insights into the influence of flame instabilities on H-fueled spark-ignition engines. Finally, the elucidation of turbulence and flame-wall interactions in attenuating thermodiffusive instabilities presents a promising avenue for future research.\",\"PeriodicalId\":408,\"journal\":{\"name\":\"Proceedings of the Combustion Institute\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the Combustion Institute\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1016/j.proci.2024.105391\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Combustion Institute","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.proci.2024.105391","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
An experimental investigation of lean hydrogen flame instabilities in spark-ignition engines
This experimental study explores the pivotal role of thermodiffusive and hydrodynamic instabilities in shaping the early development of lean hydrogen flames within a spark-ignition engine. Utilizing high-speed planar laser-induced fluorescence of inert SO tracer gas, the flame front is visualized to scrutinize the lean H flame propagation in an optically accessible single-cylinder spark-ignition engine operating at 800rpm and intake pressures of 0.4bar and 0.95bar. Comparisons between H/air and CH/air flames reveal minimal disparity in the statistical distributions of flame surface density under identical initial conditions. This suggests that, within the dynamic engine environment, the influences of thermodiffusive and hydrodynamic instabilities may be counteracted by competing factors, including turbulence and dynamic volume confinement. While traditional bomb calorimeter experiments and laminar simulations provide insights into hydrogen flame evolution, their observed effects may be less pronounced in real-world applications where turbulence and flame-wall interactions play a major role. However, by significantly reducing the equivalence ratio, the observed increase in underscores that the cumulative effects of flame instabilities become notable under extremely lean conditions, even within the dynamic engine environment. This study marks a significant step in gaining new insights into the influence of flame instabilities on H-fueled spark-ignition engines. Finally, the elucidation of turbulence and flame-wall interactions in attenuating thermodiffusive instabilities presents a promising avenue for future research.
期刊介绍:
The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review.
Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts
The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.