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Concept

Altitude et vitesse (aéronautique)

Publications associées (11)

Numerical and experimental investigation of spiral-grooved gas journal bearings

Elia Iseli

Small-scale turbomachinery is increasingly used in carbon-free energy conversion systems, such as commercial or domestic scale heat pumps, fuels cells for transportation and waste heat recovery. The usage of aerodynamic bearings allows the design of compac ...

EPFL2022

The dynamics and timescales of static stall

Karen Ann J Mulleners, Sébastien Le Fouest, Julien Dominique Claude Deparday

Airfoil stall plays a central role in the design of safe and efficient lifting surfaces. We typically distinguish between static and dynamic stall based on the unsteady rate of change of an airfoil’s angle of attack. Despite the somewhat misleading denotat ...

2021

Analysis of Pitot tube Airflow Velocity Sensor Behavior in Blockage Situations

Ata Jedari Golparvar

Several airplanes crashes throughout the past decades are linked to the failure of the airplane flow velocity sensor known as pitot device or pitot tube. The study of its behavior in blockage, either due to human errors or due to environmental factors, cou ...

IEEE2020

Time-Continuous Phosphorus Flows in the Indian Agri-Food Sector: Long-Term Drivers and Management Options

Claudia Rebeca Binder Signer

Phosphorus (P) is a major agricultural nutrient and, in its mineable form, a potentially scarce resource. Countries with limited physical access to P should hence develop an effective national P governance. This requires analyses of trends and variations i ...

2018

Coexistence of Drift Waves and D'Angelo Modes at Different Position and Frequency in Linear Plasma Device

Minh Quang Tran, Nathan Dupertuis

Experimental plasma discharges in linear PANTA device are studied by Mach probe measurements, providing floating potential, ion saturation current, and parallel flow velocity time evolution, at different radii of the device. Spectral analysis indicates tha ...

Japan Soc Plasma Science & Nuclear Fusion Research2017

Influence of Blade Aspiration on the Flow Quality of an Annular Axial Compressor Cascade

Peter Ott, Elia Colombo

Experimental and numerical investigations were performed in order to develop a technique of active flow control by aspiration applied to an annular axial compressor cascade. Continuous aspiration is applied through shaped slots located on the suction side ...

2011

Advanced Instrumentation for Measuring Fluid-Structure Coupling Phenomena in the Guide Vanes Cascade of a Pump-Turbine Scale Model

François Avellan, Mohamed Farhat, Vlad Hasmatuchi, Steven Roth

In the present study, the fluid-structure coupling is investigated in the guide vanes of a pump-turbine scale model placed in one of the test rigs of the Laboratory for Hydraulic Machines (EPFL) in Lausanne. The paper focuses on the advanced instrumentatio ...

American Soc Mechanical Engineers, Three Park Avenue, New York, Ny 10016-5990 Usa2010

Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli, Joaquim Loizu Cisquella, Gennady Plyushchev, Kyle Gustafson, Stefan Müller, Lucia Isabel Federspiel, Davoud Iraji, Alice Burckel

Electrostatic turbulence, related structures and their effect on particle, heat and toroidal momentum transport are investigated in TORPEX simple magnetized plasmas using high-resolution diagnostics, control parameters, linear fluid models and nonlinear nu ...

Institute of Physics2010

Effects of high-speed airflows on a surface dielectric barrier discharge

Christoph Hollenstein, Peter Ott, Pénélope Leyland, Samantha Pavon

A detailed study of the interaction between high-speed gas flows and surface dielectric barrier discharges (DBD) is presented. In the present paper, it is demonstrated that a DBD can be sustained in transonic airflows, up to isentropic Mach numbers of 1.1. ...

2007

Dissipative processes in interchange driven scrape-off layer turbulence

Jonathan Graves, Richard Pitts, Jan Horacek

First principles expressions are given for the parameters governing collisional diffusion and parallel losses of mass, momentum and energy in tokamak scrape-off layer (SOL) plasmas. These dissipative, or damping, coefficients are based on neoclassical perp ...

IOP Publishing Ltd2007

Highly loaded compressor with boundary layer suction

Klaus Hubrich

An experimental and numerical investigation of boundary layer suction (BLS) on a transonic compressor blade has been conducted. The objective of the present work is to identify the possible benefit of boundary layer suction via a slot in the region of the ...

EPFL2005