Hao Xia , Weijie Zhang , Wang Han , Jinhua Wang , Zuohua Huang , Jeroen van Oijen
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引用次数: 0
Abstract
One of the major difficulties to adapt H-enriched fuels in industrial combustors is the high tendency of flashback. Given the challenge of transient flashback diagnostics in experiment, large eddy simulation (LES) becomes an effective approach to study it. In this study, the flamelet generated manifold (FGM) coupled with LES is applied to simulate the flashback of premixed CH/air and (95% H/5% CH)/air flames in a bluff-body swirl burner established by University of Texas. A revised tabulation method to include the preferential diffusion of H was proposed, which is special to also efficiently cover the heat loss and stretch effects. Good agreement between experimental and numerical results is attained as to the flashback mode and speed. It is found that the preferential diffusion of H significantly promotes the flashback, which causes increased H concentration near the flame front, and leads to higher flame temperature and lower tip–wall distance. The flame front area is also increased with preferential diffusion thus expected to promote the flashback speed.
Novelty and Significance Statement
A revised FGM method including preferential diffusion of hydrogen in the multi-dimension tabulation is proposed and applied to improve hydrogen-enriched flashback prediction. Especially, the varied mixture fraction in the FGM table is attained by varying the inlet mixture components instead of modifying the inlet equivalence ratio as traditionally conducted, which can capture the species and element variation better and cover the heat loss and stretch effects more efficiently. For both flames with or without hydrogen enrichment, the simulated flashback mode and flashback speed correspond well to the experimental results. The flashback behaviors were examined and major reasons for the improved flashback prediction due to the inclusion of hydrogen preferential diffusion were revealed.
期刊介绍：
The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on:
Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including:
Conventional, alternative and surrogate fuels;
Pollutants;
Particulate and aerosol formation and abatement;
Heterogeneous processes.
Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including:
Premixed and non-premixed flames;
Ignition and extinction phenomena;
Flame propagation;
Flame structure;
Instabilities and swirl;
Flame spread;
Multi-phase reactants.
Advances in diagnostic and computational methods in combustion, including:
Measurement and simulation of scalar and vector properties;
Novel techniques;
State-of-the art applications.
Fundamental investigations of combustion technologies and systems, including:
Internal combustion engines;
Gas turbines;
Small- and large-scale stationary combustion and power generation;
Catalytic combustion;
Combustion synthesis;
Combustion under extreme conditions;
New concepts.
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