A free-vortex wake (FVW) model is developed in this paper to analyse the unsteady aerodynamic performance of offshore floating wind turbines. A time-marching algorithm of third-order accuracy is applied in the FVW model. Owing to the complex floating platform motions, the blade inflow conditions and the positions of initial points of vortex filaments, which are different from the fixed wind tur...

An experimental study was conducted to investigate the aerodynamic characteristics of a NASA low speed GA(W)-1 airfoil at the chord Reynolds number of ReC=160,000. Aerodynamic hysteresis was observed for the angles of attack close to the static stall angle of the airfoil. In addition to mapping surface pressure distribution around the airfoil, a high-resolution PIV system was used to make detai...

wind turbines are important devices that extract clean energy from wind flow. the efficiency of wind turbines should be examined under various working conditions in order to estimate off-design performance. numerous aerodynamic and structural research works have been carried out to compute aeroelastic effects on wind turbines. most of them suffer from either the simplicity of the modelling appr...

Abstract With the recent rapid evolution of UAM class concepts in past years, re-emerged interest VTOL and their aerodynamics arises. The tilt-wing is one possible solutions for such a vehicle. Recent decades aerodynamic research point to importance understanding transition regime from cruise hover. Especially wing stall phenomena which affect descent capabilities control during landing phase. ...

The design of wind turbines requires a deep insight into their complex aerodynamics, such as dynamic stall single airfoil and flow vortices. calculation the aerodynamic forces on turbine blade at different angles attack (AOAs) is fundamental task in blades. accurate efficient (lift drag) prediction an are challenging tasks. Computational fluid dynamics (CFD) able to provide better understanding...

Flying animals exploit highly nonlinear dynamics to achieve efficient and robust flight control. It appears that the distributed flow force sensor arrays found in flying are instrumental enabling this performance. Using a wind-tunnel wing model instrumented with of strain pressure sensors, we characterized relationship between signals aerodynamic load-related variables. Estimation approaches ba...

Although there have been many proposed methods to model unsteady aerodynamic effects in the stall and poststall region, little work has done directly assess impact of models on stability control characteristics. In this paper, state-space method for modeling is combined with bifurcation analysis examine sensitivity behavior choice method: quasi-steady or unsteady. It found that can adequately c...

Abstract Dynamic stall, which has a significant effect on the aerodynamic performances of dynamic airfoils, is closely related to physics stall vortex (DSV). The DSV NACA 0012 airfoil was experimentally studied using unsteady pressure measurements with high time accuracy. experimental Reynolds number Re = 1.5 × 10 6 , and reduced frequency k 0.069. propagation field during process analyzed in d...

With roller coaster traditional fuel prices and ever increasing energy demand, wind energy has known significant growth over the last years. To pave the way for higher efficiency and profitability of wind turbines, advances have been made in different aspects related to this technology. One of these has been the increasing size of wind turbines, thus rendering the wind blades gigantic, lighter ...

Ducted fans installed on vertical takeoff and landing vehicles experience significant ground effect during landing. The aerodynamic characteristics of a ducted fan hovering transitioning in the are studied using numerical simulations this paper. flowfields obtained by solving Reynolds Averaged Navier–Stokes equations with Multiple Reference Frame approach. When hovers effect, blade thrust incre...