Results 31 to 40 of about 1,012,225 (263)

A Methodology for Robust Load Reduction in Wind Turbine Blades Using Flow Control Devices

Energies, 2021
Decades of wind turbine research, development and installation have demonstrated reductions in levelized cost of energy (LCOE) resulting from turbines with larger rotor diameters and increased hub heights. Further reductions in LCOE by up-scaling turbine
Abhineet Gupta, Mario A. Rotea, Mayank Chetan, Mohammad S. Sakib, D. Todd Griffith   +4 more
doaj   +1 more source

Active Feedback Control of a Web Flutter Using Flow Control Devices

Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2010
This paper develops a non-contact active feedback control of web flutter in a narrow passage by using movable plates set at inlet and outlet of the passage.
Yusuke HAYASHI, Masahiro WATANABE, Kensuke HARA   +2 more
doaj   +1 more source

Active Flow Control of Helicopter Rotor Based on Coflow Jet

International Journal of Aerospace Engineering, 2022
When a helicopter rotor undergoes flow separation, the drag of the rotor increases substantially, as does the power demand, which seriously affects the aerodynamic performance and flight safety of the helicopter.
Jiaqi Liu, Rongqian Chen, Qiaochu Song, Yancheng You, Zheyu Shi   +4 more
doaj   +1 more source

Magnetically Actuated Microvalves for Active Flow Control [PDF]

Journal of Physics: Conference Series, 2006
The reattachment of separated air flows can be actively controlled by blowing oscillatory air jets in the boundary layer, through submillimetric holes situated near the separation edge. To achieve such pulsed jets, a high flow rate, high actuation frequency microvalve was designed, fabricated and characterized.
Ducloux, Olivier, Deblock, Yves, Talbi, Abdelkrim, Gimeno, Leticia, Tiercelin, Nicolas, Pernod, Philippe, Preobrazhensky, Vladimir L., Merlen, Alain   +7 more
openaire   +3 more sources

Active gaze control improves optic flow-based segmentation and steering. [PDF]

PLoS ONE, 2012
An observer traversing an environment actively relocates gaze to fixate objects. Evidence suggests that gaze is frequently directed toward the center of an object considered as target but more likely toward the edges of an object that appears as an ...
Florian Raudies, Ennio Mingolla, Heiko Neumann   +2 more
doaj   +1 more source

Advances in Flow Control Methods for Pump-Stall Suppression: Passive and Active Approaches

Energies
This article provides a comprehensive review of key approaches to suppressing stall flow in pumps, offering insights to enhance pump performance and reliability.
Hongbo Zhao, Xiangkai Zhou, Long Meng, Xuejin Zhu, Chengqi Mou, Peijian Zhou   +5 more
doaj   +1 more source

Active flow control on airfoils by reinforcement learning

Ocean Engineering, 2023
Active flow control is a widespread practice for airfoil aerodynamic performance enhancement. Within active flow control, reactive strategies are very effective, but the adequate design of these strategies is often complex. This study proposes a reactive control strategy based on a Reinforcement Learning (RL) agent to effectively govern the motion of a
Koldo Portal-Porras, Unai Fernandez-Gamiz, Ekaitz Zulueta, Roberto Garcia-Fernandez, Saioa Etxebarria Berrizbeitia   +4 more
openaire   +2 more sources

Active Flow Control for High-Speed Trains: From Local Flow Manipulation to Mission-Adaptive Aerodynamic Control

Fluids
High-speed train aerodynamics have mainly been improved by passive design methods, such as streamlined noses, local fairings, and surface smoothing. These methods have achieved clear benefits, but several important aerodynamic problems remain difficult ...
Li Sheng, Kaimin Wang, Xiaodong Chen, Yujun Liu, Tanghong Liu   +4 more
doaj   +1 more source

Active flow separation control at the outer wing [PDF]

CEAS Aeronautical Journal, 2019
Within the European project AFLoNext, one of the technological streams is dedicated to the investigation of active flow control (AFC) to increase the robustness of the wing tip design at takeoff conditions, whilst allowing the optimization of aerodynamic efficiency in cruise. AFC is used to delay the wing tip stall, which is caused by vortex breakdown,
Rosenblum, Jean-Pierre, Vrchota, Petr, Prachar, Ales, Peng, Shia-Hui, Wallin, Stefan, Eliasson, Peter, Iannelli, Pierluigi, Ciobaca, Vlad, Wild, Jochen, Hantrais-Gervois, Jean-Luc, Costes, Michel   +10 more
openaire   +4 more sources

Experimental Investigation of Lift Enhancement and Drag Reduction of Rotor Airfoil Using Co-flow Jet Concept

Hangkong gongcheng jinzhan, 2021
As the novel active flow control technology,Co-flow Jet concept(CFJ)is one of the most potential methods to achieve the high lift enhancement and drag reduction of rotor airfoil.Based on the OA 312 rotor airfoil,the CFJ rotor airfoil dynamometric model ...
ZHANG Shunlei, YANG Xudong, SONG Bifeng, WANG Bo, LI Zhuoyuan   +4 more
doaj   +1 more source