Applying colour-coded particle image velocimetry to the wake of a delta wing across a wide range of angles of attack

Abstract

The forces acting on a delta wing are predominantly influenced by local flow structures, specifically leading-edge vortices (LEVs). This study applies colour-coded particle image velocimetry (PIV) to quantify wake dynamics and lift generation for a delta wing at varying angles of attack in wind tunnel experiments. Key contributions include an application of the novel colour-PIV technique through comparison with theoretical models and previous experimental data, and an in-depth analysis of vortex dynamics. Results reveal that LEVs exhibit maximum stability and strength at an angle of attack of 30°, corresponding to peak lift generation. These findings provide insights into the aerodynamic characteristics of delta wings and demonstrate the advantages of colour-PIV in experimental fluid mechanics.