Airfoil is a fundamental geometry in designing various aerodynamic objects. Passive flow control installation essential determining the airfoil's performance. The influence of variations slat size as passive instrument analyzed using CFD method with Reynold number Re= 10^6 . NACA 6641 airfoil was used 10%c and 16%c. Based on computational results, have substantial efficiency airfoil. Variations...

The co-flow jet is a zero-net-mass-flux active flow control strategy and presents great potential to improve the aerodynamic efficiency of future fuel-efficient aircrafts. present work integrate technology into shape optimization further realize co-flow-jet airfoil performance. results show that maximum energy ratio lift augmentation drag reduction increased by 203.53% ( α = 0°) 10.25% 10°) at ...

Abstract This study is to investigate the stall flutter of high-speed rotating blade section small-scale blades subjected combined flap-lag motion. The work motivated by destructive flapwise vibrations blades. aeroelastic governing equations combine a spring-mass-damper equivalent structure and nonlinear aerodynamic model suitable for pure pitching resulting are solved linearization time-marchi...

The prediction accuracy of aeroelastic stability in fans and compressors depends crucially on the underlying aerodynamic predictions. prevalent approach field solves unsteady Reynolds-averaged Navier—Stokes equations presence blade vibration. Given unsteady, three-dimensional often separated nature flow regimes interest, confidence URANS methods is questionable. This paper uses simple test case...

Conventional quaternion based methods have been extensively employed for spacecraft attitude control where the aerodynamic forces can be neglected. In the presence of aerodynamic forces, the flight attitude control is more complicated due to aerodynamic moments and inertia uncertainties. In this paper, a robust nero-adaptive quat...

active flow control has great importance in design of flying objects in general and control flaps in particular. using dielectric barrier discharge as plasma actuators over control flaps can cause a change in position of separation point or can eliminate it. this new flow control device produces a body force that causes generating a micro wall jet. the present study aims to investigate experime...

This paper provides 2D Computational Fluid Dynamics (CFD) investigations, using OpenFOAM package, of the unsteady separated fully turbulent flows past a NACA 0015 airfoil undergoing sinusoidal pitching motion about its quarter-chord axis in deep stall regime at reduced frequency 0.1, free stream Mach number 0.278, and Reynolds number, based on chord length, , . First, eighteen steady-state comp...

Gliding has often been discussed in the literature as a possible precursor to powered flight in vertebrates, but few studies exist on the mechanics of gliding in living animals. In this study I analyzed the 3D kinematics of sugar gliders (Petaurus breviceps) during short glides in an enclosed space. Short segments of the glide were captured on video, and the positions of marked anatomical landm...