압력 변화에 따른 천연가스-수소 혼소 가스터빈 싱글 노즐 연소기의 연소불안정 특성 분석
Analysis of Combustion Instability Characteristics of a Single-Nozzle Combustor in a Natural Gas-Hydrogen Co-firing Gas Turbine under Varying Operating Pressures
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This study analyzes combustion instability characteristics in a natural gas-hydrogen co-firing gas turbine single-nozzle combustor under varying pressure conditions. Experiments were conducted with hydrogen co-firing ratios of 0% and 30% at pressures from 1.3 to 3.0 bar, combined with OH* chemiluminescence imaging and 1D thermoacoustic analysis. Results show that both hydrogen co-firing and pressure increases reduce flame length, thereby decreasing time delay in the flame transfer function and increasing combustion instability susceptibility. 1D thermoacoustic analysis revealed that pressure effects occur through flame dynamics variations rather than acoustic mechanisms. Gain margin analysis demonstrates that the combined effects of hydrogen co-firing and pressure increases substantially reduce the stable operating envelope for this combustor configuration.
Abstract
This study analyzes combustion instability characteristics in a natural gas-hydrogen co-firing gas turbine single-nozzle combustor under varying pressure conditions. Experiments were conducted with hydrogen co-firing ratios of 0% and 30% at pressures from 1.3 to 3.0 bar, combined with OH* chemiluminescence imaging and 1D thermoacoustic analysis. Results show that both hydrogen co-firing and pressure increases reduce flame length, thereby decreasing time delay in the flame transfer function and increasing combustion instability susceptibility. 1D thermoacoustic analysis revealed that pressure effects occur through flame dynamics variations rather than acoustic mechanisms. Gain margin analysis demonstrates that the combined effects of hydrogen co-firing and pressure increases substantially reduce the stable operating envelope for this combustor configuration.