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Investigating Vortex Ring Reconnection in Twin Parallel Pulsed Jets: Influence of Nozzle Spacing and Stroke Ratio


Investigating Vortex Ring Reconnection in Twin Parallel Pulsed Jets: Influence of Nozzle Spacing and Stroke Ratio

Chevalier, Théo (2023) Investigating Vortex Ring Reconnection in Twin Parallel Pulsed Jets: Influence of Nozzle Spacing and Stroke Ratio. Masters thesis, Concordia University.

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Even though interactions between pulsed jets showed great importance in biological fluid transport, they remain poorly described. An experimental piston/cylinder apparatus is designed to produce twin parallel pulsed jets. Using Particle Image Velocimetry (PIV), we investigate how vortex ring reconnection is influenced by nozzle spacings (S/D_0) varying from 1.49 and 3.20 and stroke ratios (L/D_0) between 2 and 4. Velocity and vorticity visualization suggest there is a critical spacing ratio from which the pulsed jets interact. This value is found to be approximately 3. Below 1.5, the vortex rings are already merged at the jet exit. By implementing a vortex core identification method based on the swirling strength criterion, the reconnection point is then localized. The results highlight how important is the effect of the nozzle spacing compared to the stroke ratio, although the influence of L/D_0 increases with the distance between the jets. Finally, time-frequency analyses confirm the highly fast changes in velocity and vorticity observed during reconnection, and emphasize the importance of the reconnection phase in the newly formed structure.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Thesis (Masters)
Authors:Chevalier, Théo
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Mechanical Engineering
Date:6 June 2023
Thesis Supervisor(s):Kadem, Lyes and Ng, Hoi Dick
Keywords:Vortex rings, pulsed jets, stroke ratio, nozzle spacing, formation time
ID Code:992421
Deposited By: Théo Chevalier
Deposited On:17 Nov 2023 14:27
Last Modified:17 Nov 2023 14:27


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