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Investigation of direct combustion noise in turbulent premixed jet flames using DNS

Event Type: 
Date and Time: 
Friday, November 6, 2020 - 16:30
Location: 
Zoom
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Dr. Davy Brouzet

Direct combustion noise plays a key role in the triggering and dynamics of thermo-acoustic instabilities of modern gas turbines. Moreover, many combustion devices can produce high levels of noise, while being subjected to stringent noise regulations. Achieving a better understanding of the sound production by premixed flames is important for designing safer and quieter combustion devices. The presented research has for goals to study the mechanisms involved in the sound generation process of turbulent premixed jet flames using DNS. State of the art post-processing methods are used to analyze the importance of shear layer structures and flame `annihilation events’ to the generated sound. The impact of chemistry modelling on combustion noise is also studied and differences between simple and complex mechanisms are investigated.

Bio: 
Dr. Davy Brouzet is a postdoctoral researcher at the Stanford Center for Turbulence Research. He obtained his Bachelor and Master degree from the Swiss Federal Institute in Lausanne (EPFL) in 2012 and 2014, respectively. Then, he pursued his PhD at the University of Melbourne under the supervision of Prof. Michael Brear and Dr. Mohsen Talei, studying combustion noise in turbulent premixed flames using direct numerical simulations. During this time, he was fortunate to collaborate with researchers from Caltech and CERFACS. His research interests include turbulent combustion, aero-acoustics and combustion noise, and numerical methods for reacting flows.