Combustion mechanisms for CFD applications

 

Abstract

kinetics reductionAlthough essential to ensure the reliability of combustion models, the use of detailed kinetic mechanisms for CFD applications poses several problems, too. Indeed, especially when dealing with heavy compounds, their dimensions can easily become unmanageable from a computational point of view. In the worst cases they may contain up to thousands of species and tens of thousands of reactions. A possible solution to this issue consists in developing and applying automatic reduction techniques to detailed mechanisms. Indeed, in the specific operating conditions (temperature, pressure, composition?), not all the species and reactions contribute in the same way to the final output provided by a model. For this reason, literature presents several methods to eliminate from a kinetic mechanism such species and reactions which are considered as not important for the concerned purposes. Among the available reduction methods, the analysis of reacting fluxes (RFA) in different combustion systems proves efficient in reducing the size of the original mechanism. In this way, ad hoc schemes can be created for specific fuels, which can be used for CFD application, too, without losing in accuracy. This work will focus on a wider validation of this method for several fuels and operating conditions, as well as exploring possible paths to its further improvement and optimization.

 

Details

Duration: 10-12 months

Experimental activities: no

Skills: programming with C++, fundamentals of chemical kinetics

People involved: Alessandro Stagni, Alessio Frassoldati, Alberto Cuoci

Contacts: Alessio Frassoldati