Ze Wang, Xun Li, Tao Li, Andreas Dreizler, Andrei N. Lipatnikov, Xiao Liu, Xiaohua Gan, Bo Zhou
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引用次数: 0
Abstract
Ammonia-hydrogen (NH-H) blends stand as a promising carbon-neutral fuel alternative. This study delves into the variation in the internal structure of NH-H flames with varying Lewis numbers (Le) and turbulence intensities. Simultaneous multi-scalar imaging of NH/NH/OH was performed to characterize the structures of turbulent jet flames with the same unstretched laminar flame speed (30.8 cm/s) but different H contents. Internal flame structures were characterized by isocontours of NH, NH (both inner and outer edges, NH and NH), and OH to delimit the reaction zone. The parallelism of the selected isocontours (i.e., NH, NH, and NH) with the OH baseline was quantified by calculating the probabilities, (), of the selected isocontours overlapping with the OH baseline shifted by a distance of along its normal direction. On the one hand, results have revealed that increasing turbulence disrupts the parallelism of the selected isocontours with the OH baseline, leading to a larger and FWHM, as well as a reduced skewness of the () profiles. On the other hand, flames with higher H content and lower Le exhibit great resistance to turbulence but experience enhanced wrinkling due to the differential diffusion effect, which can also cause deviations in scalar parallelism at low turbulence intensity. For flames with reduced Le numbers, the NH isocontours are observed to be located even downstream of the NH isocontours, which belong to the reaction zone. The extent of parallelism for the selected isocontours within the reaction zone is found to respond to turbulence and Le differently, deviating from an idealized picture of the flamelet manifold.
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.