Xun Li, Ze Wang, Tao Li, Andreas Dreizler, Andrei N. Lipatnikov, Xiao Liu, Xiaohua Gan, Bo Zhou
{"title":"利用多尺度成像技术研究贫富预混合 NH3/H2 湍流火焰的燃烧速度","authors":"Xun Li, Ze Wang, Tao Li, Andreas Dreizler, Andrei N. Lipatnikov, Xiao Liu, Xiaohua Gan, Bo Zhou","doi":"10.1016/j.proci.2024.105541","DOIUrl":null,"url":null,"abstract":"Two groups of both lean and rich NH/H/O/N turbulent premixed piloted jet flames with the same laminar flame speed are investigated using simultaneous multi-scalar laser diagnostics techniques including NH/NH/OH planar laser induced fluorescence (PLIF) and Rayleigh scattering. One group uses air as the oxidizer and the other uses an adapted mixture of atomic N-to-H ratio of 1:3 associated with in-situ hydrogen production from ammonia cracking. Turbulent rms velocity is varied in a wide range by changing the bulk flow velocity. Global consumption speeds are evaluated by measuring the inlet bulk flow rates of reactants and areas of time-averaged flame fronts extracted using different flame marker contours, i.e., , (inner contour), and , where designates species number density normalized using its maximum value. The obtained results show the following trends to be emphasized. First, an increase in by is more pronounced when compared to two other global consumption speeds (, where i indicates the inner contour, and ) and is close to a linear dependence. The adapted mixture shows only a moderate influence on but not on the other two. Second, is weakly affected by variations in Lewis number . On the contrary, third, is significantly higher in lean mixtures characterized by when compared to rich mixtures characterized by . Fourth, these variations in are reasonably well approximated introducing an empirical factor of into fitting onto . The qualitative difference between sensitivities of and to variations in is attributed to the fact that the NH and NH isosurfaces are localized to preheat and reaction zones, respectively, of the laminar flames. The reported experimental data imply different influence of differential diffusion on flame preheat and reaction zones, thus, calling for further research into the issue.","PeriodicalId":408,"journal":{"name":"Proceedings of the Combustion Institute","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation of burning velocity of lean and rich premixed NH3/H2 turbulent flames using multi-scalar imaging\",\"authors\":\"Xun Li, Ze Wang, Tao Li, Andreas Dreizler, Andrei N. 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The obtained results show the following trends to be emphasized. First, an increase in by is more pronounced when compared to two other global consumption speeds (, where i indicates the inner contour, and ) and is close to a linear dependence. The adapted mixture shows only a moderate influence on but not on the other two. Second, is weakly affected by variations in Lewis number . On the contrary, third, is significantly higher in lean mixtures characterized by when compared to rich mixtures characterized by . Fourth, these variations in are reasonably well approximated introducing an empirical factor of into fitting onto . The qualitative difference between sensitivities of and to variations in is attributed to the fact that the NH and NH isosurfaces are localized to preheat and reaction zones, respectively, of the laminar flames. The reported experimental data imply different influence of differential diffusion on flame preheat and reaction zones, thus, calling for further research into the issue.\",\"PeriodicalId\":408,\"journal\":{\"name\":\"Proceedings of the Combustion Institute\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-07-18\",\"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.2024.105541\",\"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.2024.105541","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}
Investigation of burning velocity of lean and rich premixed NH3/H2 turbulent flames using multi-scalar imaging
Two groups of both lean and rich NH/H/O/N turbulent premixed piloted jet flames with the same laminar flame speed are investigated using simultaneous multi-scalar laser diagnostics techniques including NH/NH/OH planar laser induced fluorescence (PLIF) and Rayleigh scattering. One group uses air as the oxidizer and the other uses an adapted mixture of atomic N-to-H ratio of 1:3 associated with in-situ hydrogen production from ammonia cracking. Turbulent rms velocity is varied in a wide range by changing the bulk flow velocity. Global consumption speeds are evaluated by measuring the inlet bulk flow rates of reactants and areas of time-averaged flame fronts extracted using different flame marker contours, i.e., , (inner contour), and , where designates species number density normalized using its maximum value. The obtained results show the following trends to be emphasized. First, an increase in by is more pronounced when compared to two other global consumption speeds (, where i indicates the inner contour, and ) and is close to a linear dependence. The adapted mixture shows only a moderate influence on but not on the other two. Second, is weakly affected by variations in Lewis number . On the contrary, third, is significantly higher in lean mixtures characterized by when compared to rich mixtures characterized by . Fourth, these variations in are reasonably well approximated introducing an empirical factor of into fitting onto . The qualitative difference between sensitivities of and to variations in is attributed to the fact that the NH and NH isosurfaces are localized to preheat and reaction zones, respectively, of the laminar flames. The reported experimental data imply different influence of differential diffusion on flame preheat and reaction zones, thus, calling for further research into the issue.
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.