Low-order discrete dynamical system for H2-air finite-rate chemistry in 3D

Abstract

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.

A low-order discrete dynamical system (DDS) model for finite-rate chemistry of H2-air combustion is derived in 3D. Simulation is performed in the context of a new subgrid-scale (SGS) method. Regime maps are used to determine useful ranges of values for bifurcation parameters. Specifically, a nine-step mechanism of H2-air reactions with N2-dilution is studied. As input to the DDS model, one fixed position within the flow chosen from Meier et al., is used (Combustion Science and Technology, 1996). The results in terms of time series of velocities, species mass fractions and the sum of mass fractions are analyzed. Moreover, the results are compared with experimental data at the selected position in the flame field. Discrepancies between computed and experimental results are discussed, and possible causes for discrepancies are analyzed. The potential of applying the current DDS in large-eddy simulation is addressed.