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Title: Vortex dominated flow fields in jets from notched circular nozzles
Authors: Cai, J. 
Tsai, H.M. 
Issue Date: 2006
Citation: Cai, J.,Tsai, H.M. (2006). Vortex dominated flow fields in jets from notched circular nozzles. Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting 15 : 10819-10831. ScholarBank@NUS Repository.
Abstract: The vortex dominated flow field in jets from notched circular nozzles is investigated using numerical simulation. The nozzle denoted as S-shape notched nozzle (S-nozzle) considered in the present study has a lip which is shaped by a sine wave with two peaks and two troughs. A normal circular nozzle with the same circular cross-section is also considered both for comparison and for a better understanding of the vortex formed in the jet flow field. The vortex dynamics resulting from these two different nozzles were visualized by using a novel numerical dye visualization technique. The results indicated that the generation of streamwise vortex-pairs is due to the interaction between two opposite motions; the inward motion of the ambient fluid towards the jet axis and outwardly spreading motion of jet fluid, induced by two neighboring primary vortex-rings. These streamwise vortex-pairs are generated inside and also outside the vortex-rings and spread outward as the vortex-rings convect downstream. Comparison of the S-nozzles flow shows that for the notched S-nozzles, streamwise vortex-pairs are produced only at the peak and trough locations, in the course of the formation of azimuthal vortex-rings. This is unlike the circular nozzle where the number of streamwise vortex-pairs formed would depend on Reynolds number.
Source Title: Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
ISBN: 1563478072
Appears in Collections:Staff Publications

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