Plasma-based swirling jets
Manuel Zannone
Plasma-based swirling jets.
Rel. Jacopo Serpieri, Gioacchino Cafiero. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Aerospaziale, 2024
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Abstract
Jet flows characterized by the superposition of an azimuthal velocity component on a conventional round jet are defined as swirling jets. The induction of rotational motion to a free flow generated with a round nozzle enhances heat transfer and flame stabilization capability, making these jets widely used in industrial applications. The swirling motion is usually achieved by passive methods such as guided vanes (helical inserts) or rotating perforated plates. The aim of this study was to validate the feasibility of generating and controlling swirling jets without the use of moving parts or internal inserts. Four pairs of Dielectric Barrier Discharge plasma actuators (DBD-PAs) were instead positioned along the axial direction of the injector and evenly distributed around its circumference, so that the body force exerted by them would impart a circumferential velocity component to the axisymmetric jet flow, allowing the swirl number to be adjusted without any drag penalty and providing the capability of active control.
The jet facility at the Politecnico di Torino aerospace department's laboratory Modesto Panetti was reconfigured with a new nozzle (specifically designed and 3D-printed) and a seeding system
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