INVESTIGATION OF AERODYNAMIC CHARACTERISTICS OF NACA 0012 AIRFOILWITH BACKWARD COUNTER-ROTATING TRIANGULAR TYPE VORTEX GENERATORS


Kan F. E., Seyhan M.

The 5th International Conference of Materials and Engineering Technology (TICMET'23), Trabzon, Turkey, 13 - 16 November 2023, pp.278-285

  • Publication Type: Conference Paper / Full Text
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.278-285
  • Karadeniz Technical University Affiliated: Yes

Abstract

The experimental study aims to investigate the effects of backward counter-rotating vortex generator (VG) pairs on the suction surface of NACA 0012 airfoil at angles of attack between 0° and 30°. Experiments were carried out with the help of force measurements in a wind tunnel for Re = 6×104 at different chordwise directions that are x/c = 10%, 20%, 30%, 40%, and 50%. The NACA 0012 airfoil model has a chord of 150 mm and a spanwise of 300 mm. The dimensions of the VGs are chosen to be a length of 15 mm, a height of 5 mm, a distance between 5 mm, a distance between pairs (λ) of 30 mm and an angle of (β) VG () of 10 °. Vortex generators delayed the stall angle and enhanced the post-stall characteristics compared to the baseline model. The maximum lift coefficient (CLmax) of the airfoil with VGs at x/c = 10% and 20% is reached up to 6.15% compared to the baseline model. Compared with the baseline model, the models with VGs postponed the stall angle up to 2⁰ at x/c = 10% and 1⁰ at x/c = 20%, 30%, and 40%. VGs at x / c = 10%, 20% and 30% have increased because they are close to the airfoil's leading edge in the prestall region.