The active Gurney flap technology is investigated to improve the performance of rotorblades by allowing helicopter blades to further control the lift unbalance that rises at high speed and by damping vibration loads on the rotor hub. This technology needs validation by wind tunnel testing of a scaled model blade under rotational loading. An optimised geometry of a flexible actuation system has ...

This paper presents a study on the coupled aeroelastic/flight dynamic stability and gust response of a blendedwing-body aircraft that derives from the U.S. Air Force’s High Lift-Over-Drag Active (HiLDA) wing experimental model. An effective method is used to model very flexible blended-wing-body vehicles based on a low-order aeroelastic formulation that is capable of capturing the important str...

The present study addresses the experimental and numerical verification of the performance of a new airfoil design for lift driven vertical-axis wind-turbines (VAWT). The airfoil is obtained by a genetic algorithm optimization of the objective function proposed by Simão Ferreira and Geurts [19], which optimizes the aerodynamic performance of airfoils having a relatively larger thickness, provid...

The hypersonic aeroelastic and aerothermoelastic problem of a double-wedge airfoil typical cross-section is studied using three different unsteady aerodynamic loads: (1) third-order piston theory, (2) Euler aerodynamics, and (3) Navier-Stokes aerodynamics. Computational aeroelastic response results are used to obtain frequency and damping characteristics, and compared with those from piston the...

This paper presents the results of numerical and experimental studies wind action on longitudinal finned tubes LNG ambient air vaporizers. The main objective study was to determine aerodynamic drag coefficients for with different number fins considering various directions action. Numerical calculations were performed using CFD analysis, while tests carried out in a tunnel test stand. obtained i...

This paper discusses the mathematical existence and the numerically-correct identification of linear and nonlinear aerodynamic impulse response functions. Differences between continuous-time and discrete-time system theories, which permit the identification and efficient use of these functions, will be detailed. Important input/output definitions and the concept of linear and nonlinear systems ...

Aerodynamic optimization of building geometry has received significant attention in the design community. In this paper, a process with high-frequency force balance (HFFB) technique to determine most effective mitigation measure and synchronized pressure integration (SPI) verify effect is developed for aerodynamic high-rise buildings. Then, applied 318 m-tall building. Tests show that wind on w...

Road signs are prone to extreme winds that cause significant damage. Overhead sign structures can disrupt traffic and harm the traveling public if a failure occurs under wind conditions. In this paper, we employ Computational Fluid Dynamics (CFD) in comparative study understand aerodynamics of standard, porous, curved signs. The shows viability porous overhead boards for lessening aerodynamic l...

Abstract A blade element momentum model for predicting the aerodynamic performance of dual-rotor wind turbines (DRWTs) as an design tool is introduced in this paper. The considers inter-rotor axial velocity reduction and tangential components front rotor’s wake to interferences inflow input BEM theory. DRWT with two NREL 5MW rotors studied using present CFD simulations. Results from methods sho...