Boundary layer transition modeling on leading edge inflatable kite airfoils

Model Uncertainties in a Sharp Leading-Edge Hypersonic Boundary Layer

The effects of uncertainties in the gas-surface interaction and intermolecular interaction models on the hypersonic boundary layer development are investigated using the non-intrusive generalized polynomial chaos method. In particular, uncertainties in the surface shear stress, normal stress, heat flux, flowfield temperature and density resulting from uncertain viscosity exponent, surface tempe...

Boundary Layer Trips on Airfoils at Low Reynolds Numbers

Three categories of boundary layer trips (single 2-D plain. multiple 2-D plain, and 3-D trips) were tested on the l\106-13-128, E374, and SD7037 airfoils over t he Reynolds numbers of 100,000 to 300,000. Flow visualization and drag data were acquired for a number of trip heights and locations. To facilitate comparisons between airfoils, t rips were located relative to untripped laminar separati...

Effect of a Sinusoidal Leading Edge Pattern on Flat Plate Boundary Layer Flow

Aerofoils with a sinusoidal leading edge pattern have been the subject of the study during the recent decade due to its considerable effect on the aerodynamics performance. The leading edge variation results in the formation of streamwise counterrotating vortices which affect the boundary layer development on aerofoils. To understand the influence of the leading edge variation to the boundary l...

Two-dimensional Shock Sensitivity Analysis for Transonic Airfoils with Leading-Edge and Trailing-Edge Device Deflections

Leading Edge Vortex Development on Pitching and Surging Airfoils: A Study of Vertical Axis Wind Turbines

Vertical axis wind turbine blades undergo dynamic stall due to the large 1 angle of attack variation they experience during a turbine rotation. Particle image 2 velocimetry on a pitching and surging airfoil was used to perform time resolved 3 measurements at blade Reynolds numbers near turbine operating conditions of 105. 4 These experiments were compared to simulations performed in the rotatin...