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Center for Nonlinear Studies |
This talk is basically focused on the research work, concentrated on the chemical kinetic modeling work on the formation of Oxides of Nitrogen (NOx), regarded as a major pollutant emitted by combustion devices in high hydrogen content (HHC) fuel combustion. The underlying motivation of this work is the noted discrepancies among the existing models, which becomes critical in selecting correct kinetic model in advanced gas turbine and engine research. The first part of this work is the performance evaluation and comparison of the existing models. Based on their performances, an updated kinetic model is proposed that performs reasonably well against global as well as detailed validation targets over a wide range of temperature, pressure and fuel loading. The second part is the extension of the kinetic modeling work mentioned above for NOx formation in natural gas combustion. This extension is focused to predict fuel combustion in gas turbines and engines. In addition to the available literature data, the performance of the extended chemical kinetic model is also tested against new experimental measurements on Flow reactors, supplied to us by one of our collaborators from Princeton University. Another feature of this modeling work is the utilization of both homogeneous and transport-dependent experimental validation targets. The performance of the model shows reasonably well against various experimental venues. The third and final part of this work evaluates the performance of the proposed chemical kinetic model to predict experiments based on multidimensional calculations. A pressure based finite volume code under openFOAM platform is utilized to simulate the experiments on McKenna burner inside a flow reactor, basically conducted by another collaborator of this research project. The model could capture the flat flame structure as well as the temperature and NOx evolution profiles. One of the greatest outcomes of this study is the oscillatory flow patter, dictated by the constantly-evolving recirculation zone, originated from the back-flow dilutions. This study will help moving one step ahead to provide a chemical kinetic model to the scientific community for NOx formation in syngas and natural gas combustion, which is well-validated by one-dimensional and multidimensional experimental approaches.
Host: Kirill A. Velizhanin