A lean premix combustion method, which is used to raise the inlet temperature of gas turbines to increase the efficiency and output thereof and to achieve low emissions, has the risk that combustion becomes unstable and pressure fluctuation (combustion instability) of the combustor increases. In order to realize stable gas turbine operation, we have developed an acoustic damper, which is a device that stabilizes combustion instability by applying acoustic damping and a technology for the short-term prediction of combustion instability that sharply increases in amplitude in a short period of time. We verified these developments in the gas turbine combined cycle (GTCC) power plant validation facility (hereinafter, power plant validation facility) at Takasago Works of Mitsubishi Power, Ltd. to contribute to the realization of stable gas turbine operation.
