About the use of compact schemes approach for the Modelling of Fuel pulverization phenomenon

摘要

In recent times the studies related to the analysis about industrial combustion processes has known a rapid growth, moreover due to the energy demand for productive activities worldwide. Therefore, to reduce contaminants emissions and to improve the gains in the related processes oriented to the energy production, the sectorial studies on combustion are knowing enormous progress with the auxilium of new survey instruments. Actually the computational fluid dynamics (CFD) is a valuable tool for technical support in carrying out the experimental studies on combustion and related methods of process, in fact even the flame stability issue or the mixing and diffusion questions with reacting flows need to have been submitted by accurate numerical problem solving approach. In this particular case, where the fuel is present in liquid state, according with the point of view to make feasible a combustion process, it needs that the fluid has to be previously reduced in sufficiently little part (droplets) which are able to be easily combined with the air in same mixing ratio to determine ignition conditions. Since in the practice there are effected several operations to increase the contact surface among combustible and combustive gas in order to optimise both the mass exchange process, both energy one among these two phases, these operations are very difficult to realize completely because the fluid is initially in forms compacts due to a resistance of viscous nature. It's well known that this phenomenology is strongly influenced by some disturbs, like the pressure fluctuations, conferred to the liquid jet and conditioned by the local turbulence and the gaseous properties within the flow is injected. The introduced work has focused its effort in the development of an ad hoc adopted numerical procedure to the particular fluid dynamic situation in examination by the recourse to numerical tools with spectral-like characteristics those provide to guarantee the validity of the NS equations and, meanwhile, don't modify the physical-chemical ownership of the mixture.