Abstract
Combustion instability of a synthetic coal gas flame in a partially-premixed gas turbine combustor has been numerically studied by utilizing a lumped network code, OSCILOS. Both H₂ percentage of the coal gas consisting H₂ and CH₄ and the length of the combustor were varied in this study. A companion experimental data were borrowed and used for validating the numerical results. The predicted results reasonably agree well with the afore-mentioned experimental ones. It was found that the mode of the instability shifted to the higher mode when H₂ content of the gas became larger, and that the dominant frequency of the instability was reduced as the combustor was getting longer.
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