要約

Premixed combustion is widely used for simulation of combustion chambers of gas turbines, utilized for low NOx emission applications. However, this category of gas turbines is susceptible to combustion instability. In this regard there are limited works, which are performed recently. Therefore, the maim aim of this investigation is focused on the influence of equivalence ratio on thermo-acoustic instability in gas turbine combustion chambers. An experimental approach is applied for this study.
For this purpose, an experimental combustion chamber is designed and fabricated and various experiments are planned and performed in order to achieve the better understanding of combustion chamber behavior during stable and unstable operations. Moreover, the experimental results are compared with Rayleigh criteria, which demonstrated good agreement between them.
In order for identifying instable conditions, state space distributions of the pressure oscillations are depicted for diverse operating conditions.