3D numerical simulation of compressible swirling flow induced by means of tangential inlets |
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| Authors: | Hui‐Fen Guo Zhi‐Yong Chen Chong‐Wen Yu |
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| Institution: | 1. Textile College, Dong Hua University, Shanghai 201620, People's Republic of China;2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, People's Republic of China;3. The Key Lab of Textile Science & Technology Ministry of Education, Dong Hua University, Shanghai 201620, People's Republic of China |
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| Abstract: | The objective of the present work is to predict compressible swirl flow in the nozzle of air‐jet spinning using the realizable k–ε turbulence model and discuss the effect of the nozzle pressure. The periodic change of flow patterns can be observed. The recirculation zone near the wall of the injectors upstream increases in size and moves gradually upstream, whereas the vortex breakdown in the injector downstream shifts slowly towards the nozzle outlet during the whole period. A low axial velocity in the core region moves gradually away from the centerline, and the magnitude of the center reverse flow and the area occupied by it increase with axial distance due to the vortex breakdown. From the tangential velocity profile, there is a very small free‐vortex zone. With increasing nozzle pressure, the velocity increases and the location of vortex breakdown is moved slightly downward. However, the increase in the velocity tends to decline at nozzle pressure up to a high level. Copyright © 2008 John Wiley & Sons, Ltd. |
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| Keywords: | swirling flow vortex breakdown reverse flow recirculation zone turbulence nozzle |
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