Low-Frequency Acoustic Response of Gas Turbine Perforated Plate and Axial Swirler

Abstract

The ability of acoustic network models to model combustion instabilities is dependent on the accuracy of acoustic two-port models. While several forms of two-ports are available, the most common for these types of analyses is the scattering matrix. To facilitate the modeling of industrial-type components in these models, two industrial components, a perforated plate and an axial swirler with vane-based fuel injection, are tested in an impedance tube. Both elements were tested from 100 Hz to 1000 Hz and with bias flow

the perforated plate was tested with a 1–4% differential pressure across the plate and the axial swirler was tested with a bias flow of 0–50 m/s. The experimental results are then used to generate the scattering matrix, and the swirler experimental results are compared to previously published numerical and analytical results.