Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing
Numerous aerodynamic designs of automotive vehicle have been made to reduce aerodynamic drag for lower fuel consumption. Indeed, automotive industry was primarily interested in the passive control based on the shape changes. But, as shape modifications are limited by several factors, this industry i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2014-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=35280&issue_ID=219 |
| _version_ | 1818207972655890432 |
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| author | Rafika MESTIRI Abdelaziz AHMED-BENSOLTANE Laurent Keirsbulck Fethi Aloui |
| author_facet | Rafika MESTIRI Abdelaziz AHMED-BENSOLTANE Laurent Keirsbulck Fethi Aloui |
| author_sort | Rafika MESTIRI |
| collection | DOAJ |
| description | Numerous aerodynamic designs of automotive vehicle have been made to reduce aerodynamic drag for lower fuel consumption. Indeed, automotive industry was primarily interested in the passive control based on the shape changes. But, as shape modifications are limited by several factors, this industry is recently more focused on active flow control. In this experimental investigation, the influence of continuous blowing along the sharp edge between the roof and the rear window is addressed. This actuation represents a new configuration based on a steady blowing tangentially to the surface of the rear window of the 25 slanted Ahmed body model. The study was carried out in a wind tunnel at Reynolds numbers based on the model length up to 2:78106. The actuation leads to a maximum drag reduction slightly upper than 10% obtained with a Reynolds number of 1:74 106 and a blowing velocity of 0:65V0, where V0 is the freestream
velocity. Reductions between 6% and 7% were obtained for the other studied cases. These aerodynamic drag measurements were used to evaluate the actuator efficiency which reveals a maximum efficiency of 9. Visualizations show that tangential steady blowing increase the separated region on the rear window and consequently disrupt the development of the counter-rotating longitudinal vortices appearing on the lateral edges of the rear window. It is also noted that the flow is reattached to the upper half of the rear window. As the actuation occurred directly on the recirculation region at the top of the rear window wall, the flow control was seen very effective. |
| first_indexed | 2024-12-12T04:37:25Z |
| format | Article |
| id | doaj.art-e0a4f80ec66742f6a24e204cc6d872e8 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-12T04:37:25Z |
| publishDate | 2014-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-e0a4f80ec66742f6a24e204cc6d872e82022-12-22T00:37:56ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722014-01-0174565571.Active Flow Control at the Rear End of a Generic Car Model Using Steady BlowingRafika MESTIRI0Abdelaziz AHMED-BENSOLTANE1Laurent Keirsbulck2Fethi Aloui3LESTE, École Nationale d’Ingénieurs de Monastir, TunisieESTAUniversity Lille North of France,Polytechnic University Hauts-de-France of Valenciennes, LAMIH UMR CNRS 8201, FranceNumerous aerodynamic designs of automotive vehicle have been made to reduce aerodynamic drag for lower fuel consumption. Indeed, automotive industry was primarily interested in the passive control based on the shape changes. But, as shape modifications are limited by several factors, this industry is recently more focused on active flow control. In this experimental investigation, the influence of continuous blowing along the sharp edge between the roof and the rear window is addressed. This actuation represents a new configuration based on a steady blowing tangentially to the surface of the rear window of the 25 slanted Ahmed body model. The study was carried out in a wind tunnel at Reynolds numbers based on the model length up to 2:78106. The actuation leads to a maximum drag reduction slightly upper than 10% obtained with a Reynolds number of 1:74 106 and a blowing velocity of 0:65V0, where V0 is the freestream velocity. Reductions between 6% and 7% were obtained for the other studied cases. These aerodynamic drag measurements were used to evaluate the actuator efficiency which reveals a maximum efficiency of 9. Visualizations show that tangential steady blowing increase the separated region on the rear window and consequently disrupt the development of the counter-rotating longitudinal vortices appearing on the lateral edges of the rear window. It is also noted that the flow is reattached to the upper half of the rear window. As the actuation occurred directly on the recirculation region at the top of the rear window wall, the flow control was seen very effective.http://jafmonline.net/JournalArchive/download?file_ID=35280&issue_ID=219Ahmed body Steady blowing Control Drag reduction |
| spellingShingle | Rafika MESTIRI Abdelaziz AHMED-BENSOLTANE Laurent Keirsbulck Fethi Aloui Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing Journal of Applied Fluid Mechanics Ahmed body Steady blowing Control Drag reduction |
| title | Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing |
| title_full | Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing |
| title_fullStr | Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing |
| title_full_unstemmed | Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing |
| title_short | Active Flow Control at the Rear End of a Generic Car Model Using Steady Blowing |
| title_sort | active flow control at the rear end of a generic car model using steady blowing |
| topic | Ahmed body Steady blowing Control Drag reduction |
| url | http://jafmonline.net/JournalArchive/download?file_ID=35280&issue_ID=219 |
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