Aerodynamics of Airfoils with Leading Edge Roughness

Leading edge roughness is an important challenge for the wind energy industry as blades are permanently exposed to the damaging impacts of the environment. The contamination due to impact of insects, ice accretion and dust; as well as the erosion of the blade due to rain, debris and abrasive airborne particles increase roughness upon the surface...

Aerodynamic Effects of the Flow Field in a Vehicle Rear Wheel Arch and its Effect on the Driving Resistance

The increasing importance of climate change and stricter regulations for greenhouse gas emissions raise the pressure on the automotive industry to develop more efficient products. Besides a reduction of emissions by new combustion engines, electric vehicles are being introduced to lower the fleet fuel economy. Especially this new drivetrain...

High-Speed Free-Flight Wind Tunnel Experiment With A Compromised Quadrotor: Creating A Dataset Suitable For Identification Of Aerodynamic Forces and Moments

To aid in the continued effort of making unmanned flight safer, this paper presents the experimenting effort towards determining aerodynamic forces on a off-the-shelf quad-rotor under compromised circumstances. For the first time an Incremented Nonlinear Dynamic Inversion controller is used for compromised flight in wind tunnel conditions. For...

Aerodynamic investigation of the near wake flow topology on a two-man bobsleigh

Drag measurements on bluff-bodies such as bobsleighs using force balance systems have been in prevalence for a few decades. However these studies do not reveal anything on the flow behaviour around the body. In the recent past, various flow visualization techniques have been applied to investigate the flow behaviour around bobsleighs. Even...

Mechanisms of boundary layer transition due to isolated roughness on swept wings: An experimental study

In the context of the ongoing research regarding boundary layer transition, this project aims to study the effects of isolated cylindrical roughness elements on the transition from laminar to turbulent flow in a swept wing boundary layer. The project entails experimental campaigns: the 45 degrees swept wing model is placed inside the test...

Unsteady Pylon Loading for Pylon-Mounted Tractor Propellers