Acoustic pressure oscillations induced by confined turbulent premixed natural glas flames

The present study is concerned with the development and validation of efientt numerical algorithms to check combustion systems for their sensitivity to thermoacoustic instabilities. For this purpose, a good acoustic model is needed. Since the acoustics in combustion systems are essentially one-dimensional, an efcient onedimensional acoustic network model has been used to model this acoustic system. The most important effects that play a role in the acoustic modelling of combustion systems have been included in this network model. These effects comprise acoustic damping due to turbulence, acoustic reection at contractions and expansions with a mean ow, modication of the acoustic speed of sound due to a mean ow and the effect of a temperature gradient. Consequently, the network model can handle most combustion system layouts.