Turbulent premixed combustion has served as an integral part of combustion devices, such as gas turbine and spark-ignition engines, in the power generation and transportation sectors, respectively. However, a detailed understanding of the fundamental characteristics of turbulent premixed combustion is not yet complete. In the present work, a high-fidelity direct numerical simulation (DNS) study is performed on the distinct burning characteristics of a lean hydrogen/air premixed system in different combustion regimes, namely the thin reaction zone and distributed combustion regime of the Borghi diagram. To understand the interaction between turbulent eddies and the flame, a flame propagating in a channel is considered at different conditions by varying the Karlovitz number (Ka), while keeping the Reynolds number (ReT) same. Major discussions will be made on the morphology of the flames in different combustion regimes, and structures of the turbulent flames will be discussed.
Wonsik Song is currently a Ph.D. student studying at Computational Reacting Flow Laboratory (CRFL) led by Professor Hong Im. His research interest is on the autoignition phenomena and the DNS turbulent combustion. He obtained his Bachelor and Master degrees from Mechanical Engineering at Pukyong National University in Korea in 2012 and 2014, respectively, and the research topic of the Master’s degree was about the experimental study on the flame propagation and instability of the syngas/DME blends.