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Sensitivity analysis of spiral vortex breakdown

Ubaid Qadri (Energy)


Fuel injectors, commonly, use swirl to enhance mixing. Vortex breakdown is a common feature in such swirling flows. Previous studies have established that the initial breakdown is steady and axisymmetric but an unsteady spiralling breakdown mode develops on top of this, due to a region of absolute instability. The steady axisymmetric breakdown is studied using a linear global stability framework. The results from the global stability analysis are then used to map the regions of the flow that are most sensitive to external forcing and internal feedback.