Analysis of thermodiffusive instabilities in hydrogen/air premixed flames using a tabulated flamelet model
In this work, a comprehensive formulation including detailed transport effects through mixture-averaged molecular diffusion in the context of tabulated chemistry is applied to the study of the propagation and structure of freely propagating hydrogen flames where intrinsic instabilities play an impor...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/432900 |
| Acceso en línea: | https://hdl.handle.net/2117/432900 https://dx.doi.org/10.1016/j.ijhydene.2025.04.338 |
| Access Level: | acceso embargado |
| Palabra clave: | Lean hydrogen flames Tabulated chemistry Manifold-based methods Thermodiffusive instabilities Differential diffusion Preferential diffusion Mixture-averaged transport Àrees temàtiques de la UPC::Física::Termodinàmica::Altes temperatures |
| Sumario: | In this work, a comprehensive formulation including detailed transport effects through mixture-averaged molecular diffusion in the context of tabulated chemistry is applied to the study of the propagation and structure of freely propagating hydrogen flames where intrinsic instabilities play an important role. The performance of the tabulated approach is evaluated by comparing its predictions with those from detailed chemistry calculations. The analysis focuses on two key aspects: the model’s behaviour in both linear and non-linear regimes, and its sensitivity to pressure and temperature variations. Additionally, the impact of mesh resolution on the flame response is examined to assess the capabilities of the proposed method to recover the fundamental aspects of the flames. The analysis begins by examining the linear regime through the dispersion relation. The results indicate that thermodynamic conditions significantly influence the wavenumber range predicted by the tabulated model. Specifically, increasing temperature or pressure extends the model’s predictive capability—either by reducing flame instability (at higher temperature) or by producing a thinner flame front (at higher pressure). However, some discrepancies in the dispersion relation within the linear regime, particularly for the stable range, are observed, revealing a slight tendency of the tabulated model to overpredict flame wrinkling. Subsequently, the non-linear regime is analysed by computing global flame parameters and comparing the flame structure with the reference solutions. The results show that the model accurately captures global flame descriptors for the three conditions investigated with relative errors of less than 10%. Considering the complexity of the physical and chemical phenomena involved, it can be concluded that the model successfully reproduces the most relevant effects governing flames exhibiting thermodiffusive instabilities and offers a reliable alternative to detailed chemistry with notably lower computational cost. |
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