Aerodynamic Applications of Boundary Layer Control Using Embedded Streamwise Vortices

摘要

The objective of the proposed work is to show feasibility and effectiveness of inherent streamwise vortices to control characteristics of boundary layers through modification of their space-time scales as well as to develop an engineering approach to generation and maintenance of a favorable vortical structure near a wall. To account for flow conditions taking place in practice the formulated flow control strategy will be extended to fully developed turbulent boundary layers. The investigations were carried out experimentally in wind tunnels and numerically and were focused on structural peculiarities of a near-wall flow and their connection with integral flow characteristics. Special attention was paid to modifications of the turbulence scale/spectra, dissipation rate of turbulence energy, influence on Reynolds shear stress and estimation/measurements of skin friction coefficients. Computational results were verified by measured values of integral boundary- layer characteristics for various cases of flow control.