Turbulent Combustion Modelling and Experiments: Recent Trends and Developments
Flow, Turbulence and Combustion
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Giusti, A., & Mastorakos, E. (2019). Turbulent Combustion Modelling and Experiments: Recent Trends and Developments. Flow, Turbulence and Combustion, 103 (4), 847-869. https://doi.org/10.1007/s10494-019-00072-6
The development of better laser-based experimental methods and the fast rise in computer power has created an unprecedented shift in turbulent combustion research. The range of species and quantities measured and the advent of kHz-level planar diagnostics are now providing great insights in important phenomena and applications such as local and global extinction, pollutants, and spray combustion that were hitherto unavailable. In simulations, the shift to LES allows better representation of the turbulent ow in complex geometries, but despite the fact that the grid size is smaller than in RANS, the push towards realistic conditions and the need to include more detailed chemistry that includes very fast species and thin reaction zones emphasize the necessity of a sub-grid turbulent combustion model. The paper discusses examples from current research with experiments and modelling that focus on ame transients (self-excited oscillations, local extinction), sprays, soot emissions, and on practical applications. These demonstrate how current models are being validated by experimental data and the concerted e orts the community is taking to promote the modelling tools to industry. In addition, the various coordinated International Workshops on nonpremixed, premixed, and spray ames, and on soot are discussed and some of their target ames are explored. These comprise flames that are relatively simple to describe from a fluid mechanics perspective but contain di cult-to-model combustion problems such as extinction, pollutants and multi-mode reaction zones. Recently, swirl spray ames, which are more representative of industrial devices, have been added to the target ames. Typically, good agreement is found with LES and some combustion models such as the progress variable - mixture fraction flamelet model, the Conditional Moment Closure, and the Transported PDF method, but predicting soot emissions and the condition of complete extinction in complex geometries is still elusive.
External DOI: https://doi.org/10.1007/s10494-019-00072-6
This record's URL: https://www.repository.cam.ac.uk/handle/1810/296543
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