Results 21 to 30 of about 2,945 (117)

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

Performance Assessment of Fluidic Oscillators Tested on the NASA Hump Model

Fluids, 2021
Flow separation control over a wall-mounted hump model was studied experimentally to assess the performance of fluidic oscillators (sweeping jet actuators). An array of fluidic oscillators was used to control flow separation.
Mehti Koklu
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

Effect of Plasma Actuator Layout on the Passage Vortex Reduction in a Linear Turbine Cascade for a Wide Range of Reynolds Numbers

Actuators, 2023
This study examined how various plasma actuator (PA) configurations affect the passage vortex (PV) reduction in a linear turbine cascade (LTC) utilizing dielectric barrier discharge PAs.
Takayuki Matsunuma, Takehiko Segawa
doaj   +1 more source

A Numerical Investigation of Supersonic Combustion Flow Control by Nanosecond-Pulsed Actuations

Energies, 2023
The efficiency of supersonic combustion is largely dependent on inlet and injection parameters. Additional energy input is required in some off-design conditions, and nanosecond discharge actuation can be a solution.
Yilun Yan, Jiangfeng Wang, Jianying Lan, Keyu Li   +3 more
doaj   +1 more source

Wind Turbine Enhancement via Active Flow Control Implementation

Applied Sciences
The present research enhances the efficiency of an airfoil section from the DTU-10MW Horizontal Axis Wind Turbine (HAWT) via Active Flow Control (AFC) implementation and when using synthetic jets (SJ).
Marc Lahoz, Ahmad Nabhani, Mohammad Saemian, Josep M. Bergada   +3 more
doaj   +1 more source