Reduced chemistry model calibration using unsteady flames with repetitive extinction and ignition
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
In this paper, combustion in a narrow channel with an imposed temperature gradient is used to calibrate a reduced chemical mechanism. The focus is placed on unsteady flames with repetitive extinction and ignition (FREI) at high pressure. The reduced mechanism follows a hybrid approach, combining a small fuel-dependent submechanism with a detailed fuel-independent submechanism for the core species chemistry. The fuel-dependent submechanism consists of three species and nine reactions describing both the low and high-temperature fuel decomposition pathways. The sensitivity of the extinction and ignition locations to the fuel-dependent reactions is assessed and multiple reactions are found to affect the FREI behavior. The sensitive reactions are calibrated following a Bayesian approach. The calibrated reduced model is compared to a detailed model and good agreement in ignition delay times and laminar flame speeds is observed. Finally, this illustrates the potential of a micro flow reactor with a controlled temperature profile to test fuels, calibrate chemical models, and infer kinetic data.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); LLNL Laboratory Directed Research and Development (LDRD) Program
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1458702
- Report Number(s):
- LLNL-JRNL-742091; 896736
- Journal Information:
- Proposed Journal Article, unpublished, Vol. 2017; ISSN 9999-9999
- Publisher:
- See Research Organization
- Country of Publication:
- United States
- Language:
- English
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