Enhanced outer peaks in turbulent boundary layer using uniform blowing at moderate Reynolds number. Issue 1 (1st February 2022)

• Record Type: Journal Article
• Authors: Hasanuzzaman, Gazi; Merbold, Sebastian; Motuz, Vasyl; Egbers, Christoph
• Is Part Of: Journal of turbulence. Volume 23:Issue 1/2(2022)
• Page Start: 68
• Page End: 95
• Publication Date: 2022-02-01
• Subjects: Laser Doppler anemometry (LDA) -- Turbulent Boundary Layer (TBL) -- Turbulent Drag Reduction (TDR) -- Micro-Blowing Technique (MBT); Turbulence -- Periodicals; Turbulence -- Périodiques; 532.0527
• DOI: 10.1080/14685248.2021.2014058
• Languages: English
• ISSNs: 1468-5248

Abstract

Abstract : Uniform blowing through a permeable surface acts as an active flow control method in wall bounded flows. Such control technique was investigated in a zero pressure gradient turbulent boundary layer over a flat plate. Measurement data were obtained with the help of Laser Doppler Anemometry technique. Besides the drag reduction characteristics of such flow control method, time averaged measurement of stream-wise and wall-normal velocity components was taken at Reynolds number based on momentum thickness ( R e θ, S B L = U ∞ θ / ν ) of 1100–3670. Due to the difference in surface condition with and without blowing, mean properties of the boundary condition at wall influence the flow properties when scaled with outer scaling properties. Enhanced turbulence is observed in Reynolds stresses using statistical analysis including the thickening of the boundary layer.