NUMERICAL MODELIZATION OF A COMBUSTION-CHAMBER BY AN ASSEMBLY OF ELEMENTARY REACTORS

Present numerical 2D (TEACH) or 3D (DIAMANT) codes, solving average Na vier-Stokes equations, give mean flow characterisation within a combus tor. This paper presents some developments using numerical tracers in order to modelize the turbulent internal flow inside a combustor as an association of elementary reactors: Perfectly Stired Reactor (PSR) an d Plug Flow Reactor (PFR). By the resolution of a scalar transport equ ation it was possible to modelize the tracer behaviour. This first ste p of the study has shown that the scheme used was very important. This transport equation has been used to compute the mean residence time o f the gas phase in some zone of interest in different geometries (2D p lane, 2D axisymmetric, 3D). These results will be compared with experi mental results. Additional techniques have been developped to compute the mass flow rate between elementary reactors. Finally, these techniq ues will be applied to a real combustion chamber modelization.