Application of Multiscale POD In Acoustic Characterization of Swirl Burners

The acoustic characteristics of aero gas turbine engine combustors hold a significant place in the field of aero-engineering due to the profound impact they have on thermoacoustic response and combustion stability. The numerical investigation of engine combustor noise often involves performing Large Eddy Simulations (LES), which are highly resolved in both space and time, leading to large datasets. The size and complexity of these datasets can pose challenges for analysis, making it difficult to extract meaningful insights. In this study, we examine LES of the Magister UT swirl stabilized burner, designed in-house, that operates under pressurized and engine-representative conditions. It is demonstrated that the application of multiscale Proper Orthogonal Decomposition (mPOD) to the simulation results, facilitates the interpretation of the complex and large data. We discuss the relevant flow features that have been identified through this process and their associated acoustic frequencies. These findings are then compared with the results obtained from the standard POD method. The comparison provides valuable insights into the effectiveness and advantages of using mPOD in the analysis of swirl stabilized burners.