Paola Breda M.Sc.

Paola Breda M.Sc.
LRT 10 - Institut für Thermodynamik
Gebäude 33/400, Zimmer 3453
+49 89 6004-2126
paola.breda@unibw.de

Paola Breda M.Sc.

 

Field of research

Modeling and simulation of turbulent combustion flows in liquid rocket combustion chambers, with focus on chemistry model tabulation and optimization.

Several reduction and tabulation methods for the chemistry have been proposed from the research community. The current implementations considered in my work are:

- non-adiabatic flamelets with enthalpy defect due to flame/wall interaction

- validation of chemistry reduction models involving the low dimensional surface attractors (ILDM, TGLDM) for non-premixed turbulent flames

- chemical stiffness reduction for DNS and LES with explicit integration solvers

 

Motivation

Considerable experience has been gained in the past 50 years from space access missions based on liquid propellant rockets driven by LH2/LOX . However, elevated handling and operating costs, as well as the disadvantage of having a low thrust-to weight ratio thus a higher tank volume for LH2, brings the research towards the use of hydrocarbon fuels instead of hydrogen. Methane in particular looks as a suitable candidate.

Numerical simulations of turbulent reactive flows involving CH4/O2 chemistry have a major drawback: depending on the detailed mechanism, hundreds of species and thousands of reactions might be involved, originating a stiff numerical problem on the chemical system of equations. An affordable CFD computation to match the strict deadlines of the industry requires a knocking down of the major bottlenecks, as the stiffness of the chemical mechanism can be.

Chemistry reduction models as well as tabulation methods allow to by-pass the integration of the chemistry system at run-time. The goal here is to reach a good accuracy of the results obtained with the simplified chemistry compared to the detailed problem, which also ensures a reduction of the computational costs and the removal of the stiffness problem.

 

Teaching assistant

Winter Semesters 2018 - 2019: Fundamentals of heat transfer (in German)

 

Publications

2018

Breda, P., Zips, J., Pfitzner, M.: "A Flame-Wall Interaction Study of Laminar Wall-Parallel Diffusion Flames Simulated with a Non-Adiabatic Flamelet Approach". Work-in-Progress Poster, 37th International Symposium on Combustion, Dublin, 2018.

Breda, P., Zips, J., Pfitzner, M.: "A Non-Adiabatic Flamelet Approach for Non-Premixed O2-CH4 Combustion". Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer, Budapest, 2018.

2017

Hansinger, M., Breda, P., Zips, J., Traxinger, C., Pfitzner, M. : "Hybrid LES/RANS simulation of a GOX/GCH4 7-element rocket combustor using a non-adiabatic flamelet method".  Proceedings of the SFB/TRR40 Summer Program, 2017.

Breda, P., Dalshad, R., Pfitzner, M. : "Research on Reacting Cooling Films of GH2/GCH4 and Numerical Validation". 2nd International Workshop on Near-Wall Reactive Flows, Darmstadt, 2017.