Abstract In this paper, the prediction of unsteady flow field over typical high aspect ratio (AR) wings in transonic regime but below sonic Mach number is interest. The methodology adopted a computational approach based on small disturbance potential equation. It shown that higher AR generally have lift coefficient as well lift-to-drag ratio. With NASA’s common research model (CRM) wing, there ...

This paper address the issue of structural change, caused by ice accretion, on UAVs by utilising a Neyman Pearson (NP) based statistical change detection approach, for the identification of structural changes of fixed wing UAV airfoils. A structural analysis is performed on the nonlinear aircraft system and residuals are generated, where a generalised likelihood ratio test is applied to detect ...

A slot formed between the slat and main wing of 2D high-lift device is used to accelerate convergence flow upper surface improve field quality. In order further enhance characteristics, this paper proposes a design method for multi-channel leading-edge slats based on grid channels. On one hand, specific shape shrinking expansion tube lift characteristics leading slat. other newly plays similar ...

an experimental study was carried out on the wake of a cylinder on the back of which a plate is installed parallel to the fluid flow, with different terminal angles, where the reynolds number is 50000. at the end of the plate, blades with the height of 0.25 equal to the cylinder diameter and with 45, 90 and 135 degrees angle from the horizon, are installed where the cylinder diameter is equal t...

Abstract An artificial neural network based reduced order model (ROM) is developed to predict the load coefficients and performance of wind turbine airfoils. The trained using a representative database 972 airfoil shapes generated by perturbing design parameters in each 12 baseline airfoils defining commercially relevant modern turbines. predictions from our ROM show excellent agreement with CF...

We used a dynamically scaled mechanical model of the fruit fly Drosophila melanogaster to study how changes in wing kinematics influence the production of unsteady aerodynamic forces in insect flight. We examined 191 separate sets of kinematic patterns that differed with respect to stroke amplitude, angle of attack, flip timing, flip duration and the shape and magnitude of stroke deviation. Ins...

In the present study, vortex-induced vibrations in both In-Line and Cross-Flow directions of long flexible cylinders within a uniform flow are predicted by modified wake oscillator model. detail, Van der Pol's model with drag lift coefficients being modelled as random variables. The statistics force coefficient, i.e. mean value standard deviation, extracted from literature reporting experimenta...

The determination of aerodynamic coefficients for complex high-speed vehicles still requires experimental measurement. This paper details the development free-flight measurement technique within University Oxford High Density Tunnel. In particular, a novel image processing is developed calculating position model from video. study focuses on high Reynolds number data subscale Skylon space plane ...

This paper deals with the numerical simulation of the twodimensional, incompressible, steady air flow past an airfoil for a solar powered unmanned aerial vehicle (UAV) with internal propulsion system. This airfoil results from a NACA 2415 four digits family base airfoil modification [7] and has a propulsive outlet with the shape of a step on the suction surface. The analysis involved the airfoi...