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Development of ignition model based on G-equation in the context of large eddy simulation
This project aims to develop large eddy simulation (LES) models for ignition and early flame propagation.
Keywords: Turbulent Flames; Large Eddy Simulation; Computational Fluid Dynamic
Ignition and early flame propagation are essential factors for stable operation and thus high thermal efficiency of combustion devices. Therefore, the understanding and prediction of this phenomenon are not only of fundamental interest but also of practical importance for a range of applications such as aviation gas turbines, automotive engines, industrial furnaces, etc. Reynolds Averaged Navier-Stokes (RANS) studies of ignition and early flame propagation were conducted in the past. However, large eddy simulation (LES) modeling of this process is a relatively new subject. It was recently shown that due essentially to turbulent stretch fluctuations, spark ignition is a probabilistic phenomenon. Therefore, in contrast to RANS, which only allows representing a mean ignition event, LES seems more adequate as it represents individual realizations.
Ignition and early flame propagation are essential factors for stable operation and thus high thermal efficiency of combustion devices. Therefore, the understanding and prediction of this phenomenon are not only of fundamental interest but also of practical importance for a range of applications such as aviation gas turbines, automotive engines, industrial furnaces, etc. Reynolds Averaged Navier-Stokes (RANS) studies of ignition and early flame propagation were conducted in the past. However, large eddy simulation (LES) modeling of this process is a relatively new subject. It was recently shown that due essentially to turbulent stretch fluctuations, spark ignition is a probabilistic phenomenon. Therefore, in contrast to RANS, which only allows representing a mean ignition event, LES seems more adequate as it represents individual realizations.
In this study, we will develop LES models for ignition and early flame propagation based on the G- equation model, which is widely employed for simulations of premixed flames. The new model should be validated using the already available experiments. The combination with a HiWi-job is also possible.
In this study, we will develop LES models for ignition and early flame propagation based on the G- equation model, which is widely employed for simulations of premixed flames. The new model should be validated using the already available experiments. The combination with a HiWi-job is also possible.