Abstract
An experiment-based closure framework for turbulent combustion modeling is further validated using the Sydney piloted turbulent partially premixed flames with inhomogeneous inlets. The flames are characterized by the presence of mixed mode combustion. The framework’s closure is “trained” on multi-scalar measurements to construct thermo-chemical scalar statistics parameterized in terms of principal components (PCs). Three flame conditions are used for this training, while an additional flame is used for validation. The results show that the leading PCs exhibit complex features near the jet inlet where effects of partial premixing and the presence of different burning modes are strong. These features may not be captured through a strict definition for the mixture fraction or measures of reaction progress. Further downstream, the first 2 PCs tend to be reasonably correlated with parameters that are characteristic of nonpremixed flames, including the mixture fraction and the progress variable. Comparisons of the model predictions for unconditional mean and RMS for the measured quantities show a very good qualitative and quantitative agreement with experimental statistics for all 4 flames using the same closure for the PCs governing equations.
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Acknowledgements
Dr. Echekki’s work is supported by the National Science Foundation under Grant No. 1941430. Dr. Masri is supported by the Australian Research Council.
Funding
Dr. Echekki’s work is supported by the National Science Foundation under grant no. 1941430. Dr. Masri is supported by the Australian Research Council.
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Appendix
Appendix
In this Appendix, we include additional results of comparisons of mean and RMS profiles of species and temperature corresponding to flames FJ200-5GP-Lr75-80 and FJ200-5GP-Lr300-59. These profiles are shown in Figs.
10 and
11 for the mean profiles of temperature, major species and mixture fraction for flames FJ200-5GP-Lr75-80 and FJ200-5GP-Lr300-59, respectively. Figures
12 and
13 show the corresponding RMS profiles for both flames.
We can equally contrast the prediction of the profiles of flames FJ200-5GP-Lr75-57 (shown in Fig. 6) and FJ200-5GP-Lr300-59 (shown in Fig. 11), which have comparable inlet velocities and different degrees of inlet inhomogeneities. Although it may not be easily discernable from the plots, there are some variations between the two flames’ statistics that are captured by the model. In the near field at x/d = 5 and at x/d = 12, the peak temperature, the products’ mass fractions and H2 mass fraction in FJ200-5GP-Lr75-57 is slightly higher than in FJ200-5GP-Lr300-59. The trends are reversed at x/d = 30 with greater broadening of the mean profiles.
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Ranade, R., Echekki, T. & Masri, A.R. Experiment-Based Modeling of Turbulent Flames with Inhomogeneous Inlets. Flow Turbulence Combust 108, 1043–1067 (2022). https://doi.org/10.1007/s10494-021-00304-8
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DOI: https://doi.org/10.1007/s10494-021-00304-8