In recent years, significant efforts to suppress combustion noise and instabilities have been reported in the context of lean premixed gas turbine combustion systems. The effectiveness of an active combustion control system depends upon actuation, sensing, and control algorithms, among other factors. In spite of the significant progress in these areas, complete reliability of active combustion control in turbine engines is still a major concern, since an unexpected event can destroy the engine within a fraction of a second. Thus, passive techniques that do not affect the system volume or weight are desired to mitigate combustion instabilities and associated noise problems in turbine engines.
In view of the preceding, there is a need for a passive technique to suppress and/or mitigate combustion noise and/or stability.