Dimitrova, I.D.; Luong, M.-B.; Sanal, S.; Tingas, E.-Al.; Im, H.G. Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation. Combustion Theory and Modelling 2023, 1–35, doi:10.1080/13647830.2023.2281379.
Dimitrova, I.D.; Luong, M.-B.; Sanal, S.; Tingas, E.-Al.; Im, H.G. Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation. Combustion Theory and Modelling 2023, 1–35, doi:10.1080/13647830.2023.2281379.
Dimitrova, I.D.; Luong, M.-B.; Sanal, S.; Tingas, E.-Al.; Im, H.G. Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation. Combustion Theory and Modelling 2023, 1–35, doi:10.1080/13647830.2023.2281379.
Dimitrova, I.D.; Luong, M.-B.; Sanal, S.; Tingas, E.-Al.; Im, H.G. Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation. Combustion Theory and Modelling 2023, 1–35, doi:10.1080/13647830.2023.2281379.
Abstract
The occurrence and intensity of the detonation phenomenon at spark-ignition (SI) engine conditions is investigated, with the objective to successfully predict super-knock and to elucidate the effect of kinetics and transport at the ignition front. The computational singular perturbation (CSP) framework is employed in order to investigate the chemical and transport mechanisms of deflagration and detonation cases in the context of 2D high-fidelity numerical simulations. The analysis revealed that the detonation development is characterized by: (i) stronger explosive dynamics and (ii) enhanced role of convection. The role of chemistry was also found to be pivotal to the detonation development which explained the stronger explosive character of the system, the latter being an indication of the system's reactivity. The role of convection was found to be enhanced at the edge of the detonating front, thereby suggesting that it is the result and not the cause of the detonation onset. Moreover, the increased contribution of convection was found to be related mainly to heat convection. Remarkably, the detonation front was mainly characterized by dissipative and not explosive dynamics. Finally, diffusion was found to have negligible role to both examined cases.
Keywords
detonation; super-knock; CSP; explosive dynamics
Subject
Engineering, Energy and Fuel Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
