The present paper presents the design and the experimental assessment of an acoustic liner placed on the pressure side of a turning vane of the large S1MA windtunnel in order to reduce the noise in the test section due to drive fans noise. This paper shows the full methodology applied and the assessment of a demonstrator in real conditions.
The recovery of the first stages of reusable launchers uses deceleration boost in vacuum and inside the atmosphere at hypersonic, transonic and subsonic speeds. From the point of view of the flow dynamics, these boosts create an interaction between the retro propulsive jet and the upstream flow, that determine the mechanical and thermal loads on th...
This paper presents the initial assessment of one of the validation experiments of the Unsteady High-lift Aerodynamics – Unsteady RANS validation project (UHURA). The aim of the study is to investigate the unknown aerodynamic characteristics of a slotted Krueger during deployment and retraction phases. A DLR-F15 Airfoil model with a full span actua...
Wind tunnel generation of flows representative of the Atmospheric Boundary Layer (ABL) still requires trial-and-error based design processes for both passive and active devices. To address this issue, a new type of passive grids-Multiscale Inhomogeneous Grids (MIGs)-is presented. It takes advantage of obstruction variations and interacting wakes to...
In order to estimate the resuspension of the particles empirically, it is necessary to carry out a homogeneous distribution of the particles on the tested surfaces. Thus, in many studies, seeding or deposition in experimental chambers is performed to quantify initial concentrations for subsequent resuspension experiments. The current study was carr...
L'exploitation du matériel roulant génère plusieurs particules métalliques liées aux contacts roue-rail et pantographe-caténaire et à l'usure des composants de freinage. Malgré une composition différente de celle de l'extérieur, les particules présentes dans les stations de métro ne doivent pas être ignorées car il n'existe aucun consensus quant à ...
Worldwide around 7 million annual deaths are due to air pollution. Among all pollutants, Ultrafine Particles (UFP) cause strong adverse effects. In this paper, the dispersion of UFP is studied in the wake of car models characterized by different rear slant angles (?). Velocities and UFP concentrations are collected in a wind tunnel. The influence o...
Dans le monde, environ 7 millions de décès annuels sont dus à la pollution de l'air. Parmi tous les polluants, les particules ultrafines (UFP) provoquent des effets négatifs importants. Dans cet article, la dispersion de l'UFP est étudiée dans le sillage des modèles de voitures caractérisé par différents angles d'inclinaison arrière. Les vitesses e...
Ce stage s'est déroulé au sein du laboratoire GIE (Géomatériaux et Interactions Environnementales) du département GERS de l'Université Gustave Eiffel. L'objectif était de mener une campagne expérimentale en soufflerie en utilisant différentes techniques de vélocimétrie LASER (LDV et PIV) afin de caractériser les écoulements dans le sillage de deux ...
Improving air quality in urban environments and transportation systems is crucial. Concerns are related to health and environmental issues associated with huge costs. Car cabin is a microenvironment where pollutants can accumulate with possible risks for occupants. In automotive engineering, it has then become mandatory to study the path and disper...
