To understand the physics of the complex vortex flow field of the F/A-18 aircraft during maneuvering at high incidences, a series of flow visualizations were conducted in the IAR 0.38 x 0.51m water tunnel. A 1/72-scale model was tested on the new orbital-platform rotary apparatus at angles of attack from 20o to 65o with sideslip angles in the range 10 . It was found that the aerodynamic behavio...

There has been a resurgence of interest in the development of vertical axis wind turbines which have several inherent attributes that offer some advantages for offshore operations, particularly their scalability and low over-turning moments with better accessibility to drivetrain components. This paper describes an aerodynamic performance model for vertical axis wind turbines specifically devel...

Icing has now become an important factor endangering flight safety. This paper takes the icing data of NACA 23012 airfoil as example, establishes influence model for real-time simulation based on time and aircraft angle attack, analyzes different geometry characteristics. The two-dimensional interpolation method is used to improve aircraft’s stall area, which mainly divided into correction lift...

This paper studies the relationship between unsteady flow features and instantaneous torque and power performance of straight bladed vertical axis wind turbine at variable tip speed ratios. The rotor unsteady flow field simulation was carried out by using computational fluid dynamics method. The flow physics and the principle of changing flow filed acting on torque performance and power perform...

Trajectory tracking control for winged eVTOL aircraft is complicated by the high-angle-of-attack aerodynamics experienced during navigational flight occurring immediately after takeoff and before landing. The total energy use of vehicle can be reduced performance improved appropriately considering pitch angle in varying conditions. We present a review aerodynamic models as well an algorithm fin...

Hummingbirds are the only birds that can sustain hovering. This unique flight behaviour comes, however, at high energetic cost. Based on helicopter and aeroplane design theory, we expect that hummingbird wing aspect ratio (AR), which ranges from about 3.0 to 4.5, determines aerodynamic efficacy. Previous quasi-steady experiments with a wing spinner set-up provide no support for this prediction....

An experimental study was conducted to investigate the aerodynamic characteristics of a bio-inspired corrugated airfoil compared with a streamlined airfoil and a flat plate at the chord Reynolds number of Re= 58,000 ~ 125,000 to explore the potential applications of such bio-inspired corrugated airfoils for micro air vehicle (MAV) designs. In addition to measuring the aerodynamic lift and drag ...

Bats are the only mammals capable of powered flight, and they perform impressive aerial maneuvers like tight turns, hovering, and perching upside down. The bat wing contains five digits, and its specialized membrane is covered with stiff, microscopically small, domed hairs. We provide here unique empirical evidence that the tactile receptors associated with these hairs are involved in sensorimo...

A time-dependent numerical simulation is performed to examine the flow separation control with action of a hybrid jet (the combination synthetic and continuous jets) over NACA23012 airfoil. The unsteady Reynolds-averaged Navier–Stokes (URANS) Spalart-Allmaras (SA) turbulence model simulate field around airfoil analyse effect jet. combined placed at point on upper surface which located 12% chord...

In order to upsurge the maneuverability of micro aerial vehicles, a tubercle leading edge inspired by whale flipper was applied as passive stall control method. Although this method could be useful phenomena, effect geometrical properties on flow physic should investigated reach root them. According preceding research, some parameters wing is hot topic among researchers. The aim research explor...