Flow Control Of Turbulent Boundary Layers Using Micro-blowing: Statistical Assessment Of Stochastic Effects With Three Measurement Techniques

Turbulent boundary layer flows play a critical role in aerodynamic drag and flow control strategies. This study investigates the effects of wall-normal blowing on mean velocity profiles, turbulence statistics, and spectral properties. The experiment employs Particle Image Velocimetry to capture instantaneous velocity fields and visualize coherent structures, Laser Doppler Anemometry for high-resolution 1D velocity measurements with minimal flow disturbance, and Hot-Wire Anemometry to obtain time-resolved turbulence statistics at fine spatial scales as the reference. These techniques provide complementary insights into the redistribution of turbulent energy, Reynolds stresses, and spectral modifications due to blowing. The findings contribute to developing sustainable aerodynamic solutions by improving turbulence management and energy-efficient flow control strategies.