Vortex breakdown: Observations and explanations |
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| Institution: | 1. Department of Mechanical and Aerospace Engineering, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, Ontario K7K 7B4, Canada;2. Department of Mechanical Engineering, Université de Sherbrooke, 2500 boul. de l''Université, Sherbrooke, Québec, J1K 2R1, Canada;3. LESTE, ENIM, University of Monastir, Monastir, Tunisia;1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China;2. Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China;3. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China;4. National University of Defense Technology, Changsha Hunan 410073, China;1. School of Energy and Power Engineering, Xihua University, Chengdu 610039, China;2. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China;3. Dongfang Electric Machinery Co. Ltd, Deyang 618000, China;1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India;2. Division of Fluid and Experimental Mechanics, Luleå University of Technology, SE 971 87 Luleå, Sweden |
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| Abstract: | Some three decades have elapsed since the phenomenon of vortex breakdown was first observed in the leading-edge vortices trailing from delta wings. Shortly after these early observations, instability, wave propagation and flow stagnation were proposed as key elements, if not explanations, for vortex breakdown. In the meantime a great deal of theoretical, numerical and experimental work has been reported, much of the latter concerned with the breakdown of vortex flows in tubes. Even so, there is still nothing approaching a complete theory of vortex breakdown, and no general agreement as to its fundamental nature. In the present review we give an overview of vortex- breakdown research to date of the current level of understanding and assess, in the light of the available experimental evidence, the various theoretical proposals which have been made over the years. |
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