Giacomo Putignano
Passive and active (plasma based) swirling jets.
Rel. Jacopo Serpieri, Gioacchino Cafiero, Paolo Joao Comunian. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Aerospaziale, 2025
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Abstract
Jet flows characterized by the addition of an azimuthal velocity component to a conventional round jet are referred to as swirling jets. These flows enhance heat transfer, support flame stabilization, and improve turbulent mixing in combustion processes, making them widely applicable in industrial settings. Swirling motion is typically generated using passive methods, such as guided vanes (helical inserts) or rotating perforated plates. While these passive techniques are reliable, they are optimized for specific design parameters and may become less effective, or even counterproductive, if the flow conditions deviate from these parameters. Additionally, due to the internal inserts, these methods can induce flow blockage, resulting in a pressure drop and requiring additional energy consumption.
Alternatively, active swirl generators can be employed, imparting a tangential velocity component to the axial jet flow, while allowing for real-time control of the swirl intensity
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