抄録
In this study, we investigated the combustion characteristics of a gas turbine combustor using the spray combustion simulation method which had been developed by our group.As a result of the simulation, it was clear that the temperature distribution in the combustor was closely related to the combustion gas flow and the fuel droplets behaviors. We measured, moreover, the averaged temperature at the outlet and the mean temperature profile along the centerline of the combustor, and compared the measured data with the calculated results. As for the averaged temperature at the outlet, the simulation agreed with the measurements, but it could not predict well the temperature profile along the centerline, especially in the lower fuel feed rate. It was guessed that the discrepancy was caused by the measurement error of temperature due to the difficulty of measurement in the closed system and the calculation error in the complex flow field.
We also tried to predict the NOx formation characteristic in the combustor and compared with the measured data of the NOx concentration in the exhaust gas. As a result, it was necessary to simulate both of thermal NOx and prompt NOx formation. Thus, we developed the prompt NOx formation model in which its complex formation mechanism was modeled simply.
