Results 301 to 310 of about 816,958 (339)
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Passive Control of Pressure Fluctuations Generated by Separated Flow
AIAA Journal, 1996Measurements of wall-pressure fluctuations have been made in the flow behind a backward-facing step, with a permeable reattachment surface Different configurations are tried, the most successful producing a reduction in peak rms pressure fluctuation of about 13% and a reduction in drag of about 9%.
A. F. Heenan, J. F. Morrison
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Passive Control of Flow Induced Vibrations by Splitter Blades
Volume 2: Combustion and Fuels; Oil and Gas Applications; Cycle Innovations; Heat Transfer; Electric Power; Industrial and Cogeneration; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; IGTI Scholar Award, 1993Splitter blades as a passive control technique for flow induced vibrations is investigated by developing an unsteady aerodynamic model to predict the effect of incorporating splitter blades into the design of an axial flow blade row operating in an incompressible flow field.
H. W. D. Chiang, S. Fleeter
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Flow Control of Jet Flow by Passive Nozzle Configuration Changes
International Journal of Flow Control, 2009Nozzle 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 +4 more
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Flow around a semicircular cylinder with passive flow control mechanisms
Experiments in Fluids, 2017Wind 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 +3 more
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Sensitivity analysis and passive control of cylinder flow
Journal of Fluid Mechanics, 2008A 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 +2 more
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Using Non-Normality for Passive Laminar Flow Control
2008The 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 +3 more
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Active and passive flow control on a precessing jet
Experiments in Fluids, 2015A 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 +2 more
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Passive Flow Control Applied to a NACA23012 Airfoil In A Subsonic Flow
33rd AIAA Applied Aerodynamics Conference, 2015Aerodynamic 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, 2019The 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
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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 +3 more
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