Investigation of drag reduction performance of half NACA 0009 and 0012 airfoils placed over a trailer on the flow around truck-trailer

SEYHAN M., SARIOĞLU M.

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, cilt.35, sa.7, ss.2971-2979, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Sayı: 7
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1007/s12206-021-0620-2
  • Dergi Adı: JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.2971-2979
  • Anahtar Kelimeler: NACA 0009, NACA 0012, Drag reduction, Truck-trailer, Flow visualization, LEADING-EDGE TUBERCLES, LAMINAR SEPARATION, REYNOLDS-NUMBERS, HEAVY VEHICLES, ASPECT-RATIO, AERODYNAMICS, CAR
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

The drag reduction performance of a half airfoil attached to a trailer and the roof fairing at different positions was experimentally investigated in a wind tunnel. Half airfoils have NACA 0009 and NACA 0012 cross-section and the roof fairing position is changed from -4.5 mm to +4.5 mm. Smoke wire and surface oil flow visualization were also performed to elucidate the flow characteristic around the truck-trailer with drag reduction devices. While the drag reduction rate of the truck trailer with half airfoil is up to 10% higher than that of alone truck-trailer at all Reynolds number ranges, drag reduction of the truck trailer with the half airfoil and the roof fairing was exceeded 30% as compared to the alone truck trailer. Drag coefficient results indicated that the half NACA 0009 and NACA 0012 airfoil has an almost similar trend at the zero-roof fairing position. Laminar separation bubble formation was observed on the surface of roof fairing with the help of surface oil flow visualization.