Study on the Combustion Characteristics of a Gas Turbine Combustors under Hydrogen Co-firing Conditions

This study focuses on a gas turbine combustor designed for hydrogen co-firing conditions. A single nozzle and combustor were designed based on the industrial model for CFD. The k-omega SST turbulence model and the GRI 3.0 chemical mechanism were adopted to simulate the combustor. Simulation results showed that for unmixedness, there was a common trend of increased unmixedness at the swirler region with varying co-firing ratios, followed by a tendency to decrease. Additionally, even with the same co-firing ratio, there were differences in unmixedness depending on the operating conditions. As for velocity, higher co-firing ratios resulted in increased velocities and smaller internal recirculation zone. In terms of temperature, while the peak temperature rose with higher co-firing ratios, there was minimal difference in temperature distribution changes. For OH concentration, higher co-firing ratios led to higher concentrations and shorter flame length.