Drag Reduction by Application of Different Shape Designs in a Sport Utility Vehicle

Authors

  • O. Elsayed School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131
  • A. Omar School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131 https://orcid.org/0000-0003-3321-0728
  • A. Jeddi School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131
  • S. Elhessni School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131
  • F.Z. Hachimy School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131

DOI:

https://doi.org/10.15282/ijame.18.3.2021.03.0680

Keywords:

Passive flow control; Perforated roof; Side ram; Pressure recovery; Vortex merging

Abstract

Road vehicles drag is a direct consequence of a  large wake area generated behind. This area is  created owing to the vehicle shape, which is  determined by the class, functional and aesthetic  of the vehicle. Aerodynamic  characteristics are a ramification and not the  reason for the vehicle architecture. To enhance  pressure recovery in the wake region, hence  reduce drag, three different passive flow control  techniques were applied to sport-utility-vehicle  (SUV). A three-dimensional SUV was designed in  CATIA, and a numerical flow simulation was  conducted using Ansys-Fluent to evaluate the  aerodynamic effectiveness of the proposed flow  control approaches. A closed rectangular flap as  an add-on device modifies the wake vortex  system topology, enhances vortex merging, and  increases base pressure which leads to a drag  reduction of 15.87%. The perforated roof surface  layer was used to delay flow separation. The  measured base pressure values indicate a  higher-pressure recovery, which globally  reflected in a drag reduction of 19.82%. Finally,  air guided through side rams was used as steady  blowing. A steady passive air jet introduced at the core of the longitudinal trailing  vortices leads to a confined wake area.  The net effects appear in a global increase in the  base pressure values and the pronounced drag  reduction of 22.67%. 

Author Biographies

A. Omar, School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131

Ashraf A. Omar completed his M. Sc. (1994) and Ph.D. (1999), Aerospace
Engineering at Seoul National University (SNU) and his undergraduate
studies (Aeronautical Engineering) at University of Tripoli (1988). Before
joining UIR, he was a Professor at Aeronautical Engineering Department,
university of Tripoli (2014-2018), and Department of Mechanical Engineering
(attached to aerospace program), International Islamic University Malaysia
(IIUM, 2003-2014). Period between 2000 to 2003, he worked as lecturer with
University Putra Malaysia (UPM), Department of Aerospace Engineering. His
research interests lie in the area of computational fluid dynamics,
aerodynamics, road vehicle aerodynamics, bio-aerodynamics, unmanned aerial
vehicles and wind power engineering. He has published more than 145
journals and conferences papers. He is a co-author for three books.

A. Jeddi, School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131

Post graduate student

S. Elhessni, School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131

Post graduate student

F.Z. Hachimy, School of Aerospace and Automotive Engineering, International University of Rabat, LERMA. Campus UIR, Parc Technopolis, Rocade Rabat-Salé, 11100 – Sala Al Jadida - Maroc. Phone: +212530103131

Research Assistant

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Published

2021-09-19

How to Cite

Elsayed, O., Omar, A. A., Jeddi, A., EL HESSNI, S., & Hachimy, F. Z. (2021). Drag Reduction by Application of Different Shape Designs in a Sport Utility Vehicle. International Journal of Automotive and Mechanical Engineering, 18(3), 8870–8881. https://doi.org/10.15282/ijame.18.3.2021.03.0680

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