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DNS AND LES OF STABILIZATION AND INSTABILITIES IN ROCKET ENGINES

Event Type: 
Date and Time: 
Friday, July 10, 2015 - 16:00
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Dr. Thierry Poinsot, Research Director, CNRS, Toulouse and Head of CFD group CERFACS

Liquid fuel rocket engines using H2/O2 combustion are again a major research theme in Europe especially for the future Ariane 6 rocket. This talk will present recent progress in two critical mechanisms controlling combustion in cryogenic H2/O2 rocket engines. (1) the stabilization zone of the H2/O2 flame on the lips of a coaxial injector will be studied using DNS with full chemistry and a dual resolution of heat transfer within the splitter plate of the injector. (2) the first full LES of a complete rocket engine installed at DLR Lampoldshausen will be described. Using LES and a simplified chemical model, this simulation allows to capture and identify the two strongest modes (10 and 20 kHz) appearing in this 100 MW engine. Comparisons with experiments show that LES is able to discriminate between stable and unstable regimes. 

Bio: 
Dr Thierry Poinsot is a research director at CNRS Toulouse (IMFT lab), head of the CFD group at CERFACS and senior research fellow at Stanford University. He has authored more than 180 papers in refereed journals and 200 communications in the field of combustion. He is the author of the textbook "Theoretical and numerical combustion" with Dr D. Veynante and an associate editor of Combustion and Flame.