Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles
Investigating the effects of aerodynamic characteristics in the automotive segment has been one of the thrust areas of research in the recent years. Extensive research had been carried out earlier in minimizing the aerodynamic drag of the car body and to study the effects using passive air flow defl...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2018-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=44271&issue_ID=246 |
| _version_ | 1818186968918392832 |
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| author | G. Shankar G. Devaradjane |
| author_facet | G. Shankar G. Devaradjane |
| author_sort | G. Shankar |
| collection | DOAJ |
| description | Investigating the effects of aerodynamic characteristics in the automotive segment has been one of the thrust areas of research in the recent years. Extensive research had been carried out earlier in minimizing the aerodynamic drag of the car body and to study the effects using passive air flow deflectors. Little work has been conducted on semi-active or actively controlled air flow modification techniques. In order to contribute new knowledge in the chosen area and to draw the attention of current researchers the present work focuses on the study of aerodynamic characteristics of a typical sedan car model equipped with three numbers of delta shaped vortex generators (VGs) as an aerodynamic add-on device to delay the early flow separation of air from the vehicle body. The yaw angles of the VGs are semi actively controlled using mini stepper motors. The middle VG is kept stationary, whereas the other two VGs orientation has been modified and the results have been studied. The aerodynamic property of a car model mounted with four distinct yaw angle configurations obtained by means of mini stepper motor has been quantitatively evaluated by sub-sonic wind tunnel tests and computational analysis. From the experiments the peak drag and lift coefficient reduction rates of 4.53% and 2.55% respectively have been observed in the case of car model with vortex generators having leading edges facing the rear end and the mid plane of the car respectively when compared with the car model without vortex generators. Numerical simulation using realizable (k- ε) model predicted the drag and lift coefficient reduction rates closer to the experimental values and also it predicted the existence of magnitude of turbulent kinetic energy variation in the roof portion of the car model with four dissimilar configurations of vortex generators relative to the case of car model without vortex generators. |
| first_indexed | 2024-12-11T23:03:34Z |
| format | Article |
| id | doaj.art-f167acf7df7d4f628ffc865f4cb53a46 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-11T23:03:34Z |
| publishDate | 2018-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-f167acf7df7d4f628ffc865f4cb53a462022-12-22T00:47:00ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722018-01-01111285295.Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw AnglesG. Shankar0G. Devaradjane1Department of Automobile Engineering Madras Institute of Technology Campus, Anna University, Chromepet, Chennai, Tamilnadu, India.Department of Automobile Engineering Madras Institute of Technology Campus, Anna University, Chromepet, Chennai, Tamilnadu, India.Investigating the effects of aerodynamic characteristics in the automotive segment has been one of the thrust areas of research in the recent years. Extensive research had been carried out earlier in minimizing the aerodynamic drag of the car body and to study the effects using passive air flow deflectors. Little work has been conducted on semi-active or actively controlled air flow modification techniques. In order to contribute new knowledge in the chosen area and to draw the attention of current researchers the present work focuses on the study of aerodynamic characteristics of a typical sedan car model equipped with three numbers of delta shaped vortex generators (VGs) as an aerodynamic add-on device to delay the early flow separation of air from the vehicle body. The yaw angles of the VGs are semi actively controlled using mini stepper motors. The middle VG is kept stationary, whereas the other two VGs orientation has been modified and the results have been studied. The aerodynamic property of a car model mounted with four distinct yaw angle configurations obtained by means of mini stepper motor has been quantitatively evaluated by sub-sonic wind tunnel tests and computational analysis. From the experiments the peak drag and lift coefficient reduction rates of 4.53% and 2.55% respectively have been observed in the case of car model with vortex generators having leading edges facing the rear end and the mid plane of the car respectively when compared with the car model without vortex generators. Numerical simulation using realizable (k- ε) model predicted the drag and lift coefficient reduction rates closer to the experimental values and also it predicted the existence of magnitude of turbulent kinetic energy variation in the roof portion of the car model with four dissimilar configurations of vortex generators relative to the case of car model without vortex generators.http://jafmonline.net/JournalArchive/download?file_ID=44271&issue_ID=246Drag force; Lift force; Vortex generators; Wind tunnel; Ahmed body; Computational simulation; Stepper motor. |
| spellingShingle | G. Shankar G. Devaradjane Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles Journal of Applied Fluid Mechanics Drag force; Lift force; Vortex generators; Wind tunnel; Ahmed body; Computational simulation; Stepper motor. |
| title | Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles |
| title_full | Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles |
| title_fullStr | Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles |
| title_full_unstemmed | Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles |
| title_short | Experimental and Computational Analysis on Aerodynamic Behavior of a Car Model with Vortex Generators at Different Yaw Angles |
| title_sort | experimental and computational analysis on aerodynamic behavior of a car model with vortex generators at different yaw angles |
| topic | Drag force; Lift force; Vortex generators; Wind tunnel; Ahmed body; Computational simulation; Stepper motor. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=44271&issue_ID=246 |
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