CSC is a powerful software tool for predicting and analyzing combustion-driven thermoacoustic instabilities. It reconstructs the combustion system as a network model consisting of multiple acoustic elements, whose acoustic behavior is described by a transfer matrix of acoustic pressure (p) and acoustic particle velocity (u). By solving the transfer behavior of the entire acoustic system, CSC predicts critical frequencies.

The software is available for Windows and Linux operating systems. With an intuitive graphical interface and a library of thermoacoustic elements, CSC simplifies model creation and stability assessment.

Based on real combustor geometry, the software constructs a network model consisting of multiple acoustic elements. The properties of these elements are parameterized, allowing for further adjustments based on measurement data. Acting as the source of unsteady heat release, the flame serves as one element in the acoustic network. Its transfer function can be approximated using analytical models or, more accurately, obtained from experimental data or numerical analysis and directly imported into the software. Thanks to the parameterized feature, geometric modifications can be easily incorporated into the CSC network model.

A network model of an acoustic system can be created with CSC by dragging quadropole blocks from the thermoacoustic element library into a new model window. This is part of the “Model Setup” tab, where individual blocks can be arranged and connected by linking their inports and outports. The library of acoustic models provides quadropole blocks for the basic elements needed to model a gas turbine combustion system.

• Stability Criterion: Both the matrix criterion (complex eigenfrequencies) method and the Deuker/Nyquist criterion method are implemented
• Model Library: A library of Quadropole models is implemented for ducts, annular ducts, area discontinuities, branchings, volumes, diffusors, etc...
• Comprehensive post-processing capabilities: Visualization of total or local frequency response, pressure, sound particle velocity, impedance, etc... Into Bode diagram, automated export of results