On hydrodynamic effects during self-excited thermoacoustic oscillations

Abstract eng:
We study hydrodynamic aspects during a self-sustained thermoacoustic oscillation by means of a fully compressible CFD simulation. By coupling the CFD domain to state-space formulated impedance boundary conditions, an elongation of the plenum can easily be realized without changing the computational grid. We obtain different states of self-sustained thermoacoustic oscillations by varying the plenum length of the setup. Instantaneous flow fields reveal a vortex shedding at the burner plate of the investigated slit burner induced by large velocity fluctuations. The vortices are transported downstream by convection and interact with each other and the flame front, respectively. We observe that vortex-vortex and vortex-flame interactions influence the form of the thermoacoustic oscillations strongly.

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