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

Abstract

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.