Numerical simulation

Modeling of the burner of the new test rig

The CFD analysis is a relatively new field for the group. However, there were analyses performed since 2015, the lack of available computational power didn’t allow the student projects to have a scale-up and run a large variety of setups within a single semester. In 2018, the FIEK Grant allowed us to acquire four servers which were powerful enough to perform transient calculations in a few hundred thousand cells. Obviously, these capabilities lie far from state-of-the-art technology in this field. Nevertheless, this opportunity means the sweet spot since basic models, concepts, geometries can be tested, and following these preliminary analyses, we can efficiently join other research groups for large-scale projects running on highly powerful clusters.

Presently, the goal of the ongoing project is to evaluate the design of the new burner numerically. Since the burner geometry is highly modular, the evaluation of various parts can be estimated in advance to help in designing the experiments. These elements are various atomizer nozzles, injectors for gaseous fuels or swirl control air, swirler vanes, and burner quarls. Besides the analysis of the geometry, various liquid and gaseous fuels can also be evaluated. Since detailed mechanisms cannot be used here due to the limited computational capabilities, the general trends are enough for a preliminary analysis. Since the results of the calculation will be tested in the rig, validation through flame pictures, spectrally filtered light signal, combustion noise, and flame emission spectrometry can be performed.