Passive drag reduction of square back road vehicles
Bluff body vehicles such as trucks and buses do not have a streamlined shapes and hence have high drag which can be reduced to make great savings in operational cost. While rectangular flaps have been widely studied as both passive add-ons and in active drag reducing systems for bluff bodies, cha...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Elsevier Ltd.
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/38911/4/1-s2.0-S0167610514001640-main.pdf http://irep.iium.edu.my/38911/7/38911_Passive%20drag%20reduction%20of%20square%20back%20road%20vehicles.SCOPUS.pdf |
| _version_ | 1796879126398763008 |
|---|---|
| author | Altaf, Alaman Omar, Ashraf Ali Asrar, Waqar |
| author_facet | Altaf, Alaman Omar, Ashraf Ali Asrar, Waqar |
| author_sort | Altaf, Alaman |
| collection | IIUM |
| description | Bluff body vehicles such as trucks and buses do not have a streamlined shapes and hence have high
drag which can be reduced to make great savings in operational cost. While rectangular flaps have
been widely studied as both passive add-ons and in active drag reducing systems for bluff bodies,
changing the basic geometry of the flap has not been explored in literature. In this work, a baseline
drag value is obtained for a simplified MAN TGX series truck in a CFD software, and the drag
reduction of a proposed elliptically shaped flap is compared to aerodynamically equivalent
rectangular flaps. The optimal mounting angle for both flaps is found to be 501. A parametric study
of changing the ellipse semi-major axis is carried out to find the optimal length for drag reduction. A
maximum drag reduction of 11.1% is achieved using an elliptical flap with 0.12 m semi-major axis;
compared to 6.37% for a length equivalent rectangular flap, and 6.84% for a surface area equivalent
rectangular flap. Results of the pressure distribution and velocity flow behind the rear of the truck
are also given and analyzed. |
| first_indexed | 2024-03-05T23:30:42Z |
| format | Article |
| id | oai:generic.eprints.org:38911 |
| institution | International Islamic University Malaysia |
| language | English English |
| last_indexed | 2024-03-05T23:30:42Z |
| publishDate | 2014 |
| publisher | Elsevier Ltd. |
| record_format | dspace |
| spelling | oai:generic.eprints.org:389112017-09-26T07:32:41Z http://irep.iium.edu.my/38911/ Passive drag reduction of square back road vehicles Altaf, Alaman Omar, Ashraf Ali Asrar, Waqar TL1 Motor vehicles Bluff body vehicles such as trucks and buses do not have a streamlined shapes and hence have high drag which can be reduced to make great savings in operational cost. While rectangular flaps have been widely studied as both passive add-ons and in active drag reducing systems for bluff bodies, changing the basic geometry of the flap has not been explored in literature. In this work, a baseline drag value is obtained for a simplified MAN TGX series truck in a CFD software, and the drag reduction of a proposed elliptically shaped flap is compared to aerodynamically equivalent rectangular flaps. The optimal mounting angle for both flaps is found to be 501. A parametric study of changing the ellipse semi-major axis is carried out to find the optimal length for drag reduction. A maximum drag reduction of 11.1% is achieved using an elliptical flap with 0.12 m semi-major axis; compared to 6.37% for a length equivalent rectangular flap, and 6.84% for a surface area equivalent rectangular flap. Results of the pressure distribution and velocity flow behind the rear of the truck are also given and analyzed. Elsevier Ltd. 2014 Article PeerReviewed application/pdf en http://irep.iium.edu.my/38911/4/1-s2.0-S0167610514001640-main.pdf application/pdf en http://irep.iium.edu.my/38911/7/38911_Passive%20drag%20reduction%20of%20square%20back%20road%20vehicles.SCOPUS.pdf Altaf, Alaman and Omar, Ashraf Ali and Asrar, Waqar (2014) Passive drag reduction of square back road vehicles. Journal of Wind Engineering and Industrial Aerodynamics, 134 (2014). pp. 30-43. ISSN 0167-6105 http://www.elsevier.com/locate/jweia |
| spellingShingle | TL1 Motor vehicles Altaf, Alaman Omar, Ashraf Ali Asrar, Waqar Passive drag reduction of square back road vehicles |
| title | Passive drag reduction of square back road vehicles |
| title_full | Passive drag reduction of square back road vehicles |
| title_fullStr | Passive drag reduction of square back road vehicles |
| title_full_unstemmed | Passive drag reduction of square back road vehicles |
| title_short | Passive drag reduction of square back road vehicles |
| title_sort | passive drag reduction of square back road vehicles |
| topic | TL1 Motor vehicles |
| url | http://irep.iium.edu.my/38911/4/1-s2.0-S0167610514001640-main.pdf http://irep.iium.edu.my/38911/7/38911_Passive%20drag%20reduction%20of%20square%20back%20road%20vehicles.SCOPUS.pdf |
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