The present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 .  A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profil

Billard, Jean-Yves

Djeridi, Henda

Prothin, Sebastien

Sarraf, Christophe

Journal of Fluids and Structures

English

The present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profileInternational audienceThe present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profil

Prothin, Sébastien

HAL-Université de Bretagne Occidentale

Thickness effect of NACA foils on hydrodynamic global parameters, boundary layer states and stall establishment

In this paper, the influence of a single tip vortex on boundary layer detachment is studied. This study offers a preliminary approach in order to better understand the interaction between a propeller hub vortex and the rudder installed in its wake. This configuration belongs to the field of marine propulsion and encompasses such specific problem as cavitation inception, modification of propulsive performances and induced vibrations. To better understand the complex mechanisms due to propeller–rudder interactions it was decided to emphasize configurations where the hub vortex is generated by an elliptical 3-D foil and is located upstream of a 2-D NACA0015 foil at high incidences for a Reynolds number of 5 105. The physical mechanisms were studied using Time Resolved Stereoscopic Particle Image Velocimetry (TR-SPIV) techniques. Particular attention was paid to the detachment at 251 incidence and a detailed cartography of the mean and turbulent properties of the wake is presented. Proper Orthogonal Decomposition (POD) analysis was applied in order to highlight the unsteady nature of the flow using phase averaging based on the first POD coefficients to characterize the turbulent and coherent process in the near wake of the rudder

PROTHIN, Sébastien

DJERIDI, Henda

BILLARD, Jean-Yves

SAM : Science Arts et Métiers

A hierarchy of low-dimensionnal models for the transcient and post-transient cylinder wake.

An experimental study of boundary-layer transition induced vibrations on a hydrofoil.

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Effects of freestream turbulence on the performance characteristics of an airfoil.

Experimental analysis of the flow field around a propeller rudder configuration.

Fluctuating lift on a circular cylinder: review and new measurements.

Investigation of the flow field around a propeller rudder configuration: on-surface pressure measurements and velocity pressure phase-locked correlations. In:

Investigation of the three-dimensional turbulent near-wake structure past a flat plate by tomographic PIV at high Reynolds number. Journal of Fluids and Structures.

Near wake turbulence around a circular cylinder at high Reynolds number.

Prediction of hysteresis associated with the static stall of an airfoil.

Propeller tip vortex–rudder interaction. In:

Reconstruction temporelle d'un champ aérodynamique instationnaire à partir de mesures PIV non résolues dans le temps. 9ième Congrès Francophone de Technique Laser,

The effect of streamwise vortices on the turbulence structure of a separating boundary layer.

The proper orthogonal decomposition in the analysis of turbulent flows.

Coherent and turbulent process analysis effects of a longitudinal vortex on boundary layer detachment on a NACA0015 foil

Hal - Université Grenoble Alpes

In this paper, the influence of a single tip vortex on boundary layer detachment is studied.
This study offers a preliminary approach in order to better understand the interaction between a propeller hub vortex and the rudder installed in its wake. This configuration
belongs to the field of marine propulsion and encompasses such specific problem as
cavitation inception, modification of propulsive performances and induced vibrations.
To better understand the complex mechanisms due to propeller–rudder interactions it
was decided to emphasize configurations where the hub vortex is generated by an
elliptical 3-D foil and is located upstream of a 2-D NACA0015 foil at high incidences for a
Reynolds number of 5 105. The physical mechanisms were studied using Time Resolved Stereoscopic Particle Image Velocimetry (TR-SPIV) techniques. Particular attention was paid to the detachment at 251 incidence and a detailed cartography of the mean and turbulent properties of the wake is presented. Proper Orthogonal Decomposition (POD) analysis was applied in order to highlight the unsteady nature of the flow using phase averaging based on the first POD coefficients to characterize the turbulent and coherent process in the near wake of the rudder

Name not available

The present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profileThe present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profil

SARRAF, Christophe

Oskar Bordeaux

HAL-IRD

In the present paper, interactions mechanism of the propeller hub vortex with the rudder installed in its wake are studied. This configuration corresponds to the field of marine propulsion allowing specific problem such as cavitation inception, modification of the propulsive performances and induced vibrations. To better understand the complex mechanisms due to the impact of the propeller-rudder interactions decided to put more emphasis onto configuration where the hub vortex is generated by an elliptical 3D foil and is located upstream the 2D NACA0015 foil at high incidences at Reynolds number 5 105. The physical mechanism involved in the interactions between a single longitudinal vortex and boundary layer detachment was studied using time resolved stereoscopic PIV techniques. Particular attention was paid to the detachment at 25° incidence and a detailed cartography of the mean and turbulent properties of the wake is proposed. The proper orthogonal decomposition (POD) analysis was applied in order to highlight the unsteady flow aspects using phase averaging based on the first POD coefficients to characterize the turbulent and coherent process in the near wake of the rudder

Coherent and turbulent process analysis of the effects of a longitudinal vortex on boundary layer detachment on a {NACA0015} foil

The present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall angle and a detailed cartography of boundary layer structures (integral quantities and velocity profiles) is given in order to put in evidence the mechanism of the detachment and the onset of von Karman instability for thick profil

SAM;  the Arts et Métiers ParisTech open access repository

https://hal.archives-ouvertes.fr/hal-01738280

Thickness effect of Naca foils on hydrodynamic global parameters, boundary layer states and stall establishment

Thickness effect of Naca foils on hydrodynamic global parameters, boundary layer states and stall establishment

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HAL-Université de Bretagne Occidentale

SAM : Science Arts et Métiers

Hal - Université Grenoble Alpes

Name not available

Oskar Bordeaux

HAL-IRD

Oskar Bordeaux

SAM; the Arts et Métiers ParisTech open access repository