Direct Numerical Simulation of hydrogen combustion at auto-ignitive conditions: Ignition, stability and turbulent reaction-front velocity

Gruber, Andrea; Bothien, Mirko R.; Ciani, Andrea; Aditya, Konduri; Chen, Jacqueline H.; Williams, Forman A.

doi:10.1016/j.combustflame.2021.02.031

Direct Numerical Simulation of hydrogen combustion at auto-ignitive conditions: Ignition, stability and turbulent reaction-front velocity

Journal Article · Thu Jul 01 00:00:00 EDT 2021 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2021.02.031· OSTI ID:1778053

Gruber, Andrea ^[1]; Bothien, Mirko R. ^[2]; ^[3]; ^[4]; Chen, Jacqueline H. ^[5]; Williams, Forman A. ^[6]

SINTEF Energy Research, Trondheim (Norway); Norwegian Inst. of Science and Technology, Trondheim (Norway)
Zurich Univ. of Applied Sciences, Winterthur (Switzerland); Norwegian Inst. of Science and Technology, Trondheim (Norway); Ansaldo Energia Switzerland, Baden (Switzerland)
Ansaldo Energia Switzerland, Baden (Switzerland)
India Institute of Science, Bangalore (India)
Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering

Direct Numerical Simulations (DNS) are performed to investigate the process of spontaneous ignition of hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions. Mixtures of hydrogen and vitiated air at temperatures representing gas-turbine reheat combustion are considered. Adiabatic spontaneous ignition processes are investigated first, providing a quantitative characterization of stable and unstable flames. Results indicate that, in hydrogen reheat combustion, compressibility effects play a key role in flame stability and that unstable ignition and combustion are consistently encountered for reactant temperatures close to the mixture’s characteristic crossover temperature. Furthermore, it is also found that the characterization of the adiabatic processes is also valid in the presence of non-adiabaticity due to wall heat-loss. Finally, a quantitative characterization of the instantaneous fuel consumption rate within the reaction front is obtained and of its ability, at auto-ignitive conditions, to advance against the approaching turbulent flow of the reactants, for a range of different turbulence intensities, temperatures and pressure levels.

View Accepted Manuscript (DOE)

Research Organization:: Norwegian research pro- gram Centres for Environment-friendly Energy Research (FME). NCCS Centre; Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1778053

Report Number(s):: SAND--2021-3694J; 695206

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 229; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Direct Numerical Simulation of hydrogen combustion at auto-ignitive conditions: Ignition, stability and turbulent reaction-front velocity

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