Results 261 to 270 of about 171,945 (297)

Flow Control of Jet Flow by Passive Nozzle Configuration Changes

International Journal of Flow Control, 2009
Nozzle configuration may offer the possibility of a passive control technique to provide high mixing and heat transfer rates. Thus, numbers of investigations have been carried out to reveal the influence of nozzle configuration on the flow characteristics. However, very few papers in the scientific literature have focused on orifice jets.
null Shakouchi, null Kito, null Sakamoto, null Tsujimoto, null Ando   +4 more
openaire   +1 more source

Flow around a semicircular cylinder with passive flow control mechanisms

Experiments in Fluids, 2017
Wind tunnel experiments were performed to study the effect of passive flow control strategies on the wake and drag of a semicircular cylinder of infinite aspect ratio. High-resolution planar particle image velocimetry was used to obtain flow statistics around the semicircular cylinder at Reynolds number
A. M. Hamed, J. Vega, B. Liu, L. P. Chamorro   +3 more
openaire   +1 more source

Using Non-Normality for Passive Laminar Flow Control

2008
The scope of this paper was to show how optimal transient growth due to non-normality can be used as an effective amplifier of a passive laminar flow control. Optimal perturbations, usually seen as the most dangerous for transition are here seen as the most effective for control.
C. Cossu, L. Brandt, J. H. M. Fransson, TALAMELLI, ALESSANDRO   +3 more
openaire   +2 more sources

Sensitivity analysis and passive control of cylinder flow

Journal of Fluid Mechanics, 2008
A general theoretical formalism is developed to assess how base-flow modifications may alter the stability properties of flows studied in a global approach of linear stability theory. It also comprises a systematic approach to the passive control of globally unstable flows by the use of small control devices.
Marquet, Olivier, Sipp, Denis, Jacquin, Laurent   +2 more
openaire   +2 more sources

Active and passive flow control on a precessing jet

Experiments in Fluids, 2015
A precessing jet nozzle with water as the working fluid is investigated under passive and active flow control. The actuation effectiveness of 12 microjets around the nozzle inlet for active control of the precessing jet is the focus of this work. Passive control is also applied by modifying the geometry of the precessing jet either by adding a center ...
Hamed Babazadeh, David S. Nobes, Charles Robert Koch   +2 more
openaire   +1 more source

Passive Flow Control Applied to a NACA23012 Airfoil In A Subsonic Flow

33rd AIAA Applied Aerodynamics Conference, 2015
Aerodynamic subsonic flows are an important flow regime for the aeronautical/aerospace industry. Recent studies by the author have shown that the use of an active flow control device, that of a localised asymmetrically located synthetic jet, can significantly improve the aerodynamic performance of bluff and streamlined bodies by altering the three ...
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Passive feedback control of transonic buffet flow

Physics of Fluids, 2019
The activated structural degree of freedom often causes undesirable large-amplitude structural vibrations in unstable flows, such as the frequency lock-in phenomenon in the transonic buffet flow. The underlying mechanism is the instability characteristic of the system that becomes more complex, namely, further instability on the structural mode because
Chuanqiang Gao, Weiwei Zhang, Xintao Li
openaire   +1 more source

The development of passive flow control vortices [PDF]

, 2004
Surface flow visualisation and Particle Image Velocimetry (PIV) were used to investigate the flow-field of sub-boundary layer vane vortex generators (VVGs) and steady jet vortex generators (SJVGs) in a separated flow at 20m/s. The vortex generators were mounted on a 2D bump which was situated on the floor of a 350mm by 250mm wind tunnel and had a ...
openaire  

Passive flow separation control in a vaned radial diffuser

Stability and performance are pursued by the aeronautic industry as market constraints become more compelling. The present study focuses on the implementation of a passive flow control system in the vaned radial diffuser of a centrifugal compressor. The flow control consists of holes in both the hub and the shroud, connecting interblade channels with ...
Boulay, Aurélien, Pierre, Duquesne, Stéphane, Aubert, Anne-Lise, Fiquet   +3 more
openaire   +2 more sources

Review of passive control of flow past a circular cylinder

Journal of Visualization, 2022
Yize Ran, Zhi Deng, Haiyang Yu, Wenli Chen, Donglai Gao   +4 more
openaire   +1 more source