Near-Wall Investigation of Three-Dimensional Turbulent Boundary Layers

摘要: Abstract : This report documents the experimental study for four different three-dimensional turbulent flows. The investigation focuses on near wall measurements in these Several techniques are used studies; however, bulk of a three-orthogonal-velocity-component fiber-optic laser Doppler anemometer (3D-LDA) system. control volume 3D-LDA is order 50 micrometer size, or y(+) distance around 2.3 units. An auxiliary small boundary layer wind tunnel (auxiliary tunnel) and low speed linear compressor cascade (cascade utilized this study. One flow experiments done other three tunnel. first vortical created by two half-delta wing vortex generators. Near secondary features found. second an quarter chord tip gap Strong phenomena third investigated inflow to with moving wall. experiment records shear interaction between upstream Finally fourth generators attached. Phase-averaged data reveal asymmetrical structures just downstream time turbulence have been taken types