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http://dx.doi.org/10.6108/KSPE.2021.25.2.024

Numerical Investigation of the Combustion Instability inside a Partially Premixed Combustor according to Fuel Composition  

Nam, Jaehyun (Department of Aerospace Engineering, Seoul National University)
Yoh, Jai-ick (Department of Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.25, no.2, 2021 , pp. 24-33 More about this Journal
Abstract
Numerical study is conducted to analyze combustion instability in the partially premixed combustor. The simulations are performed according to fuel conditions, and Large Eddy Simulation(LES) model and PaSR combustion model are implemented in the solver. Comparison with the experimental result is conducted to confirm the validity of simulation, and quantitative and qualitative agreement is confirmed. The flame characteristics in the combustor are subsequently investigated, and the association with the occurrence of combustion instability is clarified. According to the simulation results, the flame length varies greatly depending on the fuel conditions. When the flame length becomes sufficiently long, flame-vortex interactions occurred around the wall sections, which works as the main cause of combustion instability.
Keywords
Large Eddy Simulation; Gas Turbine Combustor; Hydrogen; Combustion Instability;
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