Eva Dorignac

Eva Dorignac
Ecole Nationale Supérieure de Mécanique et d'Aérotechnique | ENSMA

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27
Publications
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102
Citations
Introduction
Skills and Expertise

Publications

Publications (27)
Thesis
Full-text available
Film cooling of aircraft gas turbine blades has been in use since a few decades now to improve the Turbine Inlet Temperature (TIT) and to extend the lifetime of the turbine blade. Additionally, stringent emission norms stipulate the improvement of overall efficiency of the gas turbine engine and hence the need to improve film cooling process. Film...
Article
Infrared thermography and PIV have been used to investigate the flow and heat transfer of quasi-annular jets. The principal parameter studied is the blockage ratio corresponding to the ratio of the inner diameter over the outer Dint/D. The mass flow rate has been taken constant between the different configurations for comparison purpose and a circu...
Conference Paper
Full-text available
In this study RANS simulations using k-ω SST turbulence model have been performed on a simple cylindrical hole configuration and a sister-hole film cooling configuration to study the improvements in adiabatic film cooling effectiveness and the complex mean vortex systems downstream of the hole. Blowing ratio in the penetration zone (M=1) has been r...
Article
The present study aims at characterizing the flow field and heat transfer for a schematic but realistic vane cooling scheme. Experimentally, both velocity and heat transfer measurements are conducted to provide a detailed database of the investigated configuration. From a numerical point of view, the configuration is investigated using isotropic an...
Conference Paper
The present study aims at characterizing the flow field and heat transfer for a schematic but realistic vane cooling scheme. Experimentally, both velocity and heat transfer measurements are conducted to provide a detailed database of the investigated configuration. From a numerical point of view, the configuration is investigated using isotropic as...
Article
Full-text available
Une étude expérimentale sur la dynamique d’un jet rond turbulent impactant une paroi plane a été menée pour un nombre de Reynolds de 28 000 et une distance d’impact de 5 diamètres. Le jet est excité par un haut-parleur sur une gamme de nombre de Strouhal allant de 0 à 1.5, permettant ainsi de modifier la structure dynamique du jet. Divers outils d’...
Conference Paper
Numerous geometrical and flow parameters can affect the heat transfer in the impinging jet cooling methods. In this study, a configuration close to a real case of vane cooling was adopted. It consists of a main crossflow flowing into an injection hole of diameter D perpendicular to the main flow through a thin plate of thickness t equal to D and th...
Conference Paper
Impingement jets are known to be efficient mechanisms for the exchange of heat between fluid and structure. They are generally used in industry for cooling, heating or drying. Several experimental and numerical studies have been realized to study convective heat transfers and/or to correlate the convective heat transfers to the wall with the unstea...
Article
Des études antérieures sur l'impact d'un jet plan sur une paroi concave à petite courbure relative ont mis en évidence un phénomène de battement du jet. Ce phénomène de battement a été étudié pour expliquer les transferts thermiques obtenus dans cette étude. Nous avons notammentobservé la quasi-uniformité du coefficient d'échange. La variation de l...
Article
Nous proposons d'étudier expérimentalement l'influence du nombre de Mach, variant de 0.1 à 0.5 sur les échanges convectifs à la paroi entre un jet rond axisymétrique et une plaque plane. La variation des profils des nombres de Nusselt est étudiée en fonction du nombre de Mach et de la distance d'impact H/D. Une étude expérimentale instationnaire de...
Article
L'étude du refroidissement par impart de jet nécessite de prendre en compte l'influence de nombreux paramètres géométriques et aérodynamiques. Le nombre d'expériences pour ce type d'étude devient trop rapidement conséquent. L'utilisation d'un plan d'expérences basé sur la méthodologie de Fisher-Taguchi va nous permettre de réduire ce nombre d'expér...
Article
Local heat transfer from an impinging high temperature jet is studied using a method based on the heat thin foil technique and on the infrared thermography. Heat thin foil technique is used to impose several heat fluxes. For each flux, the temperature distribution is recorded using infrared imaging. Local heat transfer coefficients and adiabatic wa...
Article
The protection of the combustion wall chamber of aeronautic propeller is assumed with a full coverage film cooling. In the case of 1–9 rows of eight staggered holes, we have measured several profiles of temperature in the mainstream perturbed by jets. Variations of wall temperatures Tp have been measured simultaneously along the wall. Those experie...
Article
The protection of the combustion wall chamber of aeronautic propeller is assumed with a full coverage film cooling. In the case of 1–9 rows of eight staggered holes, we have measured several profiles of temperature in the mainstream perturbed by jets. Variations of wall temperatures Tp have been measured simultaneously along the wall. Those experie...
Article
Impinging jets are frequently adapted for cooling overheated parts. With the film cooling technique, this process improves thermal exchanges between walls and fluid. However if many works have concerned only the thermal aspect of this problem[1], its dynamic field has been rarely studied especially for multiple impingements. As the two phenomena ca...
Article
Experimental study of inclined jets cross flow interaction in compressible regime. II. Effect of injection rate on surface heat transfer. An experimental study of a row of jets entering in a transonic mainstream (M=0.72) is carried out in order to investigate the influence of the injection rate, defined as the ratio of the mass fluxes per unit surf...
Article
Experimental study of inclined jets cross flow interaction in compressible regime. I. Effect of compressibility in subsonic regime on velocity and temperature fields. The results of the investigation of the interaction of a row of jets with a compressible cross flow are compared with their counterpart obtained in incompressible regime. The comparis...
Article
Full-text available
Surfaces are generally modeled as semiinfinite plane walls or thin-skinned bodies when making quick calculations of the convective transfer coefficients in high speed flow. These models may, however, lead to erroneous results because of the lateral conduction effects. A numerical investigation is reported here concerning the temperature distributio...

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