Large eddy simulation of a supersonic lifted hydrogen flame with sparse-Lagrangian multiple mapping conditioning approach

Huang, Zhiwei; Cleary, M. J.; Ren, Zhuyin; Zhang, Huangwei

doi:10.1016/j.combustflame.2021.111756

Cited by 12 publications

(1 citation statement)

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“…Only a smaller subset of positive Ω R+T regions are considered truly explosive. Hence, the diagostics solely based on Λ e, f may lead to an erroneous interpretation of the explosion characteristics, thereby rendering the drawn conclusions, in the best case, questionable [115][116][117][118][119][120][121][122]. This is in agreement with earlier work in turbulent and MILD combustion that reached the same conclusion and highlighted that Λ e, f can compete with dissipative modes which become more active (i.e., faster in terms of their timescales and stronger in terms of their amplitudes), hence the a priori use of solely Λ e, f for the characterisation of the system's dynamics is inappropriate [109,110,123,124].…”

Section: Computational Singular Perturbation (Csp) Analysismentioning

confidence: 99%

Asymptotic Analysis of Detonation Development at SI Engine Conditions Using Computational Singular Perturbation

Dimitrova¹,

Sanal²,

Luong³

et al. 2022

Preprint

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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.

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