12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Active and passive flow control
A highly loaded turbine exit guide vane with active boundary layer control was investi-gated experimentally in the High Speed Cascade Wind Tunnel at the University of the German Federal Armed Forces Munich. The experiments include profile Mach number distributions, wake traverse measurements as well as boundary layer investigations with a flattened Pitot probe. Active boundary layer control by fluidic oscillators was applied to achieve improved performance in the low Reynolds number regime. Low solidity, which can be applied to reduce the number of blades, increases the risk of flow separation re-sulting in increased total pressure losses. Active boundary layer control is supposed to overcome these negative effects. The experiments show that active boundary layer control by fluidic oscillators is an appropriate way to suppress massive open separation bubbles in the low Reynolds number regime.