Flame acceleration and transition to detonation in a pre-/main-chamber combustion system

Lai, S.; Xu, C.; Davy, M.; Fang, X.

doi:10.1063/5.0122240

Flame acceleration and transition to detonation in a pre-/main-chamber combustion system

Journal Article · Wed Nov 02 00:00:00 EDT 2022 · Physics of Fluids

DOI:https://doi.org/10.1063/5.0122240· OSTI ID:1908111

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Shanghai Jiao Tong University (SJTU) (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Transportation and Power Systems Division
Univ. of Oxford (United Kingdom)
Univ. of Oxford (United Kingdom); Univ. of Calgary (Canada)

Numerical simulations are performed to study the mechanism of deflagration to detonation transition (DDT) in a pre-/main-chamber combustion system with a stoichiometric ethylene–oxygen mixture. A Godunov algorithm, fifth-order in space, and third-order in time, is used to solve the fully compressible Navier–Stokes equations on a dynamically adapting mesh. A single-step, calibrated chemical diffusive model described by Arrhenius kinetics is used for energy release and conservation between the fuel and the product. The two-dimensional simulation shows that a laminar flame grows in the pre-chamber and then develops into a jet flame as it passes through the orifice. A strong shock forms immediately ahead of the flame, reflecting off the walls and interacting with the flame front. The shock–flame interactions are crucial for the development of flame instabilities, which trigger the subsequent flame development. The DDT arises due to a shock-focusing mechanism, where multiple shocks collide at the flame front. A chemical explosive mode analysis (CEMA) criterion is developed to study the DDT ignition mode. Preliminary one-dimensional computations for a laminar propagating flame, a fast flame deflagration, and a Chapman–Jouguet detonation are conducted to demonstrate the validity of CEMA on the chemical-diffusive model, as well as to determine the proper conditioning value for CEMA diagnostic. The two-dimensional analysis with CEMA indicates that the DDT initiated by the shock-focusing mechanism can form a strong thermal expansion region at the flame front that features large positive eigenvalues for the chemical explosive mode and dominance of the local autoignition mode. Thus, the CEMA criterion proposed in this study provides a robust diagnostic for identifying autoignition-supported DDT, of which the emergence of excessive local autoignition mode is found to be a precursor. The effect of grid size, initial temperature, and orifice size are then evaluated, and results show that although the close-chamber DDT is highly stochastic, the detonation initiation mechanism remains robust.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; National Natural Science Foundation of China (NSFC); John Fell Fund

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1908111

Journal Information:: Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 11 Vol. 34; ISSN 1070-6631

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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