Intrinsic Thermoacoustic (ITA) instabilities

Recently, a ‘new’ type of thermoacoustic instability has been of great attention for the combustion community. Although this type of instability, known as ITA instability, has been always present and some models had already considered it, it had until now escaped attention. It is based on the feedback loop present between the unsteady heat release rate and the associated upstream travelling acoustic wave radiated by the flame. One particular particularity of this type of resonance is that it is independent of the acoustic surroundings. Some studies have already shown the importance of ITA resonance. However, there are still an enormous amount of topics to be treated. Examples are ITA-cavity modes coupling or ITA modes on partially premix flames and spray combustion.