|Politecnico di Torino|
|Anno Accademico 2007/08|
Advanced modelling of particulate and pollutant formation in turbulent combustion - (didattica di eccellenza)
Dottorato di ricerca in Ingegneria Chimica - Torino
terranno il corso:
Dr. Debora Fino - Politecnico di Torino
Dr. Gilles Hardy - Iveco Motorenforschung AG
Dr. Daniele Marchisio - Politecnico di Torino
Dr. Venkatramanan - University of Texas at Austin
Dr. Alessandro Zucca - Nuovo Pignone GE Oil&Gas
Although a comprehensive general introduction on turbulent combustion will be given during the course, it will be assumed that the students master the fundamentals of turbulence, turbulent mixing and their statistical description as well as the basic governing equations of turbulent reactive flows (i.e., Navier-Stokes and continuity equations, balance equation for reactive scalars).
Part I: Theory and fundamentals [8 hours]
1. Introduction and fundamentals of turbulent combustion
Basic definitions, scales of turbulence, scales of combustion, turbulence-chemistry interaction, combustion regimes, flamelet assumption, other combustion models
2. Direct numerical simulations (DNS), Reynolds Averaged Navier Stokes (RANS), Large Eddy Simulation (LES)
Basic definitions, numerical approaches for DNS, computational expense and limitations, RANS equations of motion, turbulence modeling, standard RANS turbulence models and limitations, basics of turbulence filtering, LES equations and modeling, numerical issues, combustion modeling issues
3. The Probability Density Function (PDF) approach
Basic statistical definitions, statistical models in turbulence, PDF approach for scalars, numerical implementation, extension to LES.
4. Multiphase combustion modeling
Introduction, spray combustion fundamentals, modeling issues, current practices
4. Particle formation in flames: the Population Balance Approach
The description of particle formation and evolution in combustion processes (aggregation/coagulation, sintering, surface growth and oxidation) can be accurately carried out by resorting to an Eulerian mesoscopic approach, called population balance modeling. In this lecture this approach is presented and the numerical methods applicable are presented and discussed.
Part II: Research and industrial applications [12 hours]
5. Simulation of non-premixed turbulent combustion
Implementation of flamelet models in LES, PDF approach and experiences, numerical issues
6. Simulation of combustion in internal engines
Some practical examples of computational fluid dynamics simulations in diesel engines will be presented. Emphasis will be given to the industrial perspective.
7. Simulation of soot formation in turbulent flames
CFD simulation of particulate formation in non-premixed flames. Application of the DQMOM to solve the population balance equation for the prediction of size and morphology evolution of soot particles. Modeling issues and case studies
8. Simulation of combustion in gas turbines
Overview of the state of the art in gas turbine combustion. Non premixed and premixed (dry low NOx) combustors. Strategies for emission reductions. CFD simulation of industrial combustors.
9. Latest trends in Materials and Technologies for diesel particulate control
Within a small volume (compatible with the typical dimensions of an exhaust line), under non-steady operating conditions (related to driving dynamics), submitted to significant thermal and mechanical stresses (sudden changes in temperature, vibrations, ... ), the catalytic converters have to deliver a better and better performance at lower and lower costs. The present lesson aims at providing the students with and overall picture of the state-of-art and of the major development perspectives of this rather complex technology.
|Statistiche superamento esami|
Programma provvisorio per l'A.A.2007/08