Influence of periodic wakes on the development of a boundary layer |
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| Institution: | 1. School of Mechanical Engineering, University of Tehran, Tehran, Iran;2. School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran;3. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran;1. School of Civil Engineering, Central South University, Changsha 410075, China;2. School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 9990777, Hong Kong, China;1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;2. Arts et Métiers ParisTech, ONERA, CNRS, Univ. Lille, Centrale Lille, UMR 9014-LMFL-Laboratoire de Mécanique des Fluides de Lille-Kampé de Fériet, F-59000 Lille, France;3. Kevin T. Crofton Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, Virginia 24060, USA;1. Department of Hand and Foot Microsurgery, Yantai Hospital of Shandong Wendeng Osteopathic & Traumatology, Lvsida Road, Yantai 264009, Shandong Province, China;2. Department of Osteoarthropathy, Yantaishan Hospital, No.10087, Keji Road, Laishan District, Yantai 264001, Shandong Province, China |
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| Abstract: | The flow in turbomachinery is strongly influenced by the rotor-stator interactions. It is known that the unsteadiness of the flow has for effect to advance the laminar-turbulent transition and to alter the heat transfer. The problem of the wake-boundary layer interaction has been studied experimentally by using a simplified geometrical configuration. The stator blade is simulated by a flat plate on which the development of the boundary layer disturbed by periodic wakes is observed. The wakes are generated by moving bars having a circular section, put upstream of the flat plate and running with a constant velocity in the wind of a low-speed tunnel. Numerical studies relating to the phenomenon of interaction are limited. Part of the experimental study has been carried out in a fully turbulent flow in order to avoid the problem of transition. These results are compared with those from a code solving the fully turbulent unsteady boundary layer equations. |
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