Results 271 to 280 of about 7,951,401 (343)

Numerical investigation of lift enhancement in flapping hover flight

, 2020
The focus of this work is the study of lift enhancement in flapping hover flight using numerical simulations. An idealized set of kinematics for a NACA0012 airfoil consisting of sequential translations and rotations is considered for this purpose, such ...
A. Bharadwaj, Santanu Ghosh
semanticscholar   +1 more source

High-Lift Enhancement Using Active Flow Control

6th AIAA Flow Control Conference, 2011
The high-lift performance of an airfoil with a single-element flap is enhanced using fluidic actuation based on synthetic jet technology. Acutation is implemented using a spanwise array of individually controlled discrete synthetic jets with variable spanwise spacing that issue in a direction nominally-tangential to the flap immediately upstream of ...
Michael Desalvo, Ari Glezer, Edward Whalen   +2 more
openaire   +1 more source

Computational investigation of wing-body interaction and its lift enhancement effect in hummingbird forward flight

Bioinspiration & Biomimetics, 2019
A lift enhancement mechanism due to wing-body interaction (WBI) was previously proved to be significant in the forward flight of insect flyers with wide-shape bodies, such as cicada.
Junshi Wang, Yan Ren, Chengyu Li, Haibo Dong   +3 more
semanticscholar   +1 more source

Dry eye after LASIK enhancement by flap lifting

American Journal of Ophthalmology, 2006
ABSTRACT PURPOSE: To determine whether dry eye after LASIK recurs after LASIK enhancement. METHODS: A total of 63 eyes of 42 patients who underwent LASIK enhancement were included in this study. Subjective dry eye symptoms, tear break-up time (BUT), Schirmer test with anesthesia, fluorescein staining of the cornea, and corneal ...
Ikuko, Toda, Naoko, Kato-Asano, Yoshiko, Hori-Komai, Kazuo, Tsubota   +3 more
openaire   +2 more sources

Lift enhancement for airfoil at high angle of attack using flow-induced vibrations

The Physics of Fluids
The lift force of an elastically mounted airfoil experiencing flow-induced vibrations (FIV) in the vertical direction is studied using two-dimensional numerical simulations at the Reynolds number of 800 and high angles of attack.
A. Gao, Zhe Chen, Luoqin Liu, Xiyun Lu
semanticscholar   +1 more source

Enhancing the lift under budget constraints

Proceedings of the eleventh ACM SIGKDD international conference on Knowledge discovery in data mining, 2005
A lift curve, with the true positive rate on the y-axis and the customer pull (or contact) rate on the x-axis, is often used to depict the model performance in many data mining applications, especially in the area of customer relationship management (CRM).
Lian Yan, Michael Fassino, Patrick Baldasare   +2 more
openaire   +1 more source

High-Lift Enhancement Using Fluidic Actuation

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010
The performance of an airfoil equipped with a high-lift system based on a single-element flap configuration is enhanced by the manipulation of vorticity concentrations near the airfoil surface using fluidic actuation. The actuation, which is effected downstream of the juncture between the main airfoil body and the flap, leads to a significant extension
Michael DeSalvo, Edward Whalen, Ari Glezer   +2 more
openaire   +1 more source

Lift enhancement by an externally trapped vortex

10th Fluid and Plasmadynamics Conference, 1977
A theoretical study is made of the performance capabilities of a lift concept that utilizes a spanwise vortex over the upper surface of the wing. The vortex is generated by a vertical flap near the leading edge of the wing and maintained by suction through orifices in endplates at the wingtip.
openaire   +1 more source

Gurney flap—Lift enhancement, mechanisms and applications

Progress in Aerospace Sciences, 2008
Abstract Since its invention by a race car driver Dan Gurney in 1960s, the Gurney flap has been used to enhance the aerodynamics performance of subsonic and supercritical airfoils, high-lift devices and delta wings. In order to take stock of recent research and development of Gurney flap, we have carried out a review of the characteristics and ...
J.J. Wang, Y.C. Li, K.-S. Choi
openaire   +1 more source

Lift Enhancement over Flexible Nonslender Delta Wings

AIAA Journal, 2007
Unsteady aerodynamics of flexible nonslender delta wings is investigated in an experimental study using various techniques. Dramatic fluid/structure interactions emerge with increasing wing flexibility and result in substantial lift enhancement in the poststall region.
G. Taylor, Z. Wang, E. Vardaki, I. Gursul   +3 more
openaire   +1 more source