Non-symmetric bi-stable flow around the Ahmed body |
| |
| Institution: | 1. Institute of Fluid Mechanics and Heat Transfer (ISW), Graz University of Technology, Inffeldgasse 25/F, 8010 Graz, Austria;2. The Virtual Vehicle Research Center, Inffeldgasse 21a, 8010 Graz, Austria;1. Department of Automotive and Marine Engineering Technology, College of Technological Studies, The Public Authority for Applied Education and Training, Kuwait;2. College of Engineering, Mechanical Engineering Department, Haïl University, Haïl City, Saudi Arabia;3. Unité de Métrologie et des Systèmes Énergétiques, École Nationale d''Ingénieurs, Monastir, University of Monastir, Tunisia;4. Department of Civil Engineering, Arulmigu Palaniandavar Polytechnic College, Palani, Tamilnadu 624 601, India;5. Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran;6. Department of Mechanical Engineering, Velammal College of Engineering and Technology, Madurai, Tamilnadu 625 009, India;1. Adana Science and Technology University, Faculty of Engineering, Department of Mechanical Engineering, Adana 01180, Turkey;2. Munzur University, Faculty of Engineering, Department of Mechanical Engineering, Tunceli 62000, Turkey;3. Cukurova University, Faculty of Engineering and Architecture, Department of Mechanical Engineering, Adana 01330, Turkey |
| |
| Abstract: | The flow around the Ahmed body at varying Reynolds numbers under yawing conditions is investigated experimentally. The body geometry belongs to a regime subject to spanwise flow instability identified in symmetric flow by Cadot and co-workers (Grandemange et al., 2013b). Our experiments cover the two slant angles 25° and 35° and Reynolds numbers up to 2.784 × 106. Special emphasis lies on the aerodynamics under side wind influence. For the 35° slant angle, forces and moments change significantly with the yawing angle in the range 10° ≤ |β| ≤ 15°. The lift and the pitching moment exhibit strong fluctuations due to bi-stable flow around a critical angle β of ±12.5°, where the pitching moment changes sign. Time series of the forces and moments are studied and explained by PIV measurements in the flow field near the rear of the body. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
