Numerical Study of Biomass Combustion Using a Transient State Approach

The behavior of the temperature and velocity, as well as the mass fraction of water (H2O) and wood inside a combustion chamber under specific operating conditions, were numerically investigated using a transient state model. For the computational fluid dynamics (CFD) simulation, the software Ansys Fluent 2024 R2 was used to analyze a turbulent flow in two dimensions. The species transport with volumetric responses and eddy dissipation were included in the combustion simulation. The study was conducted for the first 150 s. The findings show that in the lower and upper zones of the combustion chamber close to the walls, the temperature rises over time. The velocity between the outlets rises over time. Due to the fact that the wood goes through a process that reduces the amount of wood and produces H2O, it exhibits the opposite behavior for the mass fractions of wood and H2O.