Thermoacoustic stability chart for high-intensity gas turbine combustion systems

摘要

The operating range of heavy duty gas turbines that feature lean premixed combustion to achieve low NO_x emissions is limited by thermoacoustic oscillations. To extend the operational envelope of the gas turbine, passive means have to be developed to suppress thermoacoustic instabilities. In order to develop passive means the complex interaction between acoustics and thermal heat release has to be taken into account. A new stability chart applicable to the qualification of industrial design has been developed that accounts for the acoustic properties of the combustion system including its boundary conditions and the flame response data.