The effect of upstream low-drag vortex generators on juncture flows

Md.Y. Younis, Hua Zhang, Bo Hu, Emad Uddin and Jawad Aslam

Abstract

Control of horseshoe vortex in the circular cylinder-plate juncture using vortex generator (VG) was studied at ReD (where D is the diameter of the cylinder) = 2.05 X105. Impact of a number of parameters e.g., the shape of the VG\'s, number of VG pairs (n), spacing between the VG and the cylinder leading edge (L), lateral gap between the trailing edges of a VG pair (g), streamwise gap between two VG pairs (SVG) and the spacing between the two VG\'s in parallel arrangement (ZVG) etc. were investigated on the horseshoe vortex control. The study is conducted using surface oil flow visualization and surface pressure measurements in low speed wind tunnel. It is observed that all the parameters studied have significant control effect, either by reduction in separation region or by lowering the adverse pressure along the symmetric axis upstream of the juncture.

Key Words

horseshoe vortex; low drag vortex generators; streamwise vortex; series arrangement of vortex generators; parallel arrangement of vortex generators

Address

Md.Y. Younis: Department of Mechanical Engineering, Mirpur University of Science and Technology (MUST), Mirpur 10250 (AJK), Pakistan Hua Zhang: National Key Laboratory of Fluid Mechanics, Beihang University (BUAA), Beijing 100191, China Bo Hu: Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, HeBei, China Emad Uddin and Jawad Aslam: Department of Mechanical Engineering, SMME, National University of Science and Technology (NUST), H-12, Islamabad, 46000, Pakistan

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