Abstract The aerodynamic efficiency in airfoil theory is defined as the ratio between lift and drag force, which main objective function to be maximized a wide kind of vehicle design due its strong relationship fuel consumption range. This work employs 4-digits NACA parameterization, recently developed 6-parameters method, PARSEC technique with correction matrices available literature, compare ...

We carried out direct numerical simulations of the flow past a two-dimensional S822 wind turbine blade section at a chord Reynolds number of Re=100,000 and an angle of attack of α = 5deg. Without blade rotation the separated boundary layer “rolls up” into spanwise vortices which then “break up” into smaller scale structures leading to transition to turbulence. Simulation results compare favorab...

An aerodynamic optimization for a Droop-Nose Leading-Edge (DNLE) morphing of well-known UAV, the UAS-S45, is proposed, using novel Black Widow Optimization (BWO) algorithm. This approach integrates algorithm with modified Class-Shape Transformation (CST) parameterization method to enhance performance by minimizing drag and maximizing endurance at cruise flight condition. The CST technique used ...

Shape memory alloy actuators have been studied for more than thirty years. Many experimental tests performed, and several patents registered. However, designing such devices is still a challenging task. On the one hand, models are not yet able to provide accuracy required replace substantial portion of tests; on other it seems that gap exists in literature between main ideas behind SMA torsiona...

Propellers for electric aviation are used in solo- and multirotor applications. Multifidelity analysis with reduced cycle time is crucial to explore several designs energy minimization range maximization. A low-fidelity design tool, py_BEM, developed of a reverse-engineered solo 2-bladed propeller using blade-element momentum theory physics enhancements including local Reynolds number effect, b...

Accurate computation of the performance a horizontal-axis wind turbine (HAWT) using Blade Element Momentum (BEM) based codes requires good quality aerodynamic characteristics airfoils. This paper shows numerical investigation transitional flow over DU 91-W2-250 airfoil with chord-based Reynolds number ranging from 3 × 106 to 6 106. The primary goal present is validate unsteady averaged Navier-S...

An aero-structural algorithm to reduce the energy consumption of a propeller-driven aircraft is developed through propeller design method coupled with Particle Swarm Optimization (PSO). A wide range parameters considered in optimization, including geometry airfoil at each section. The performance prediction tool employs convergence improved Blade Element Momentum Theory fed by aerodynamic chara...

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 ...

Since the renewable resources of energy have become extremely important, especially wind energy, scientists have begun to modify the design of the wind turbine components, mainly rotor blades. Aerodynamic design considered a major research field related to power production of a small horizontal wind turbine, especially in low wind speed locations. This study displays an approach to the selectio...