Buet, Pierre Laroche, Emmanuel Paysant, Romain Yiao, M.
Exhaust gases ejected by helicopters engines can be assimilated to jets in crossflow as they interact with a complex flow field composed of rotor downwash, relative wind and ground effect for some flight cases. This jet in crossflow configuration is characterized by a strong temperature gradient between the jet and the crossflow as exhaust gases ar...
Gelain, Matteo Couilleaux, Alexandre Errera, Marc Vicquelin, Ronan Gicquel, Olivier
Surface air-cooled oil coolers (SACOC) are one of the reference technologies adopted in modern turbofan engines to meet the lubricant-cooling requirements. Installed in the by-pass duct, the SACOC are usually composed of a series of staggered fins dissipating the heat load of the engine oil through forced convection with the by-pass flow. Due to th...
Castells, Camille Richez, François Costes, Michel
Two- and three-dimensional models representative of a helicopter rotor blade element during forward flight have been implemented. The rotor blade element is considered in pitching oscillation motion with a non-uniform translation to take into account the speed variation in forward flight. Two stalled flight conditions of the 7A rotor have been sele...
Torrent, Xavier Gregorio, Eduard Douzals, Jean Paul Tinet, Cyril Rosell Polo, Joan R. Planas, Santiago
Spray drift is one of the main pollution sources identified when pesticides are sprayed on crops. In this work, in order to simplify the evaluation of hollow-cone nozzles according to their drift potential reduction, several models commonly used were tested by three indirect methods: phase Doppler particle analyser (PDPA) and two different wind tun...
Yin, Jianping Rossignol, Karl-Stéphane Barbarino, Mattia Bianco, Davide Testa, Claudio Brouwer, Harry Janssen, Stevie Ray Reboul, Gabriel Vigevano, Luigi Bernardini, Giovanni
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Published in
CEAS Aeronautical Journal
This paper deals the activities conducted in the GARTEUR Action Group HC/AG-24 to address the noise scattering of helicopter rotors in the presence of the fuselage. The focus of the Action Group is on the development and the validation of numerical prediction methods and establishing an experimental data base for numerical validations. The numerica...
Nicolas, François
This paper aims at describing the new measurement device installed in S1MA wind tunnel for aeroacoustics tests. We present here the in-situ qualification of a traversing microphone array which equipped the acoustic closed test section of the wind tunnel. First, we show that it allows us to capture very complex directivity patterns thanks to a very ...
Schaffarczyk, Alois Peter Boisard, Ronan Boorsma, Koen Dose, Bastian Lienard, Caroline Lutz, Thorsten Madsen, Helge Aa Rahimi, Hamid Reichstein, Torben Schepers, Gérard
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Since the investigation of van Ingen et al., attempts were undertaken to search for laminar parts within the boundary layer of wind turbines operating in the lower atmosphere with much higher turbulence levels than seen in wind tunnels or at higher altitudes where airplanes usually fly. Based on the results of the DAN-Aero experiment and the Aerody...
Bourgoin, M. Baudet, C. Kharche, S. Mordant, N. Vandenberghe, T. Sumbekova, S. Stelzenmuller, N. Aliseda, A. Gibert, M. Roche, P.-E.
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Published in
CEAS Aeronautical Journal
This article describes the planning, set-up, turbulence characterization and analysis of measurements of a passive grid turbulence experiment that was carried out in the S1MA wind-tunnel from ONERA in Modane, in the context of the ESWIRP European project. This experiment aims at a detailed investigation of the statistical properties of turbulent fl...
Graumann, Gabriel Krier, Johann Adden, Stephan Breitsprecher, Bianca Cheung, Ron Cooper, Jonathan Fraschini, Piero Re Duplessy, Loretta Loiseau, Jonathan Averado, Michele
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he outcomes of a project to design, manufacture and test a large third-scale transonic wind tunnel wing model is described. The ETRIOLLA (Experimental Transonic Investigations on Laminar Flow and Load Alleviation) project was a European Union Clean Sky funded venture which demonstrated natural laminar flow and load control technologies on a large (...
Smith, E. Gordon, R. Bourque, C. Campbell, A. Genermont, Sophie Rochette, P. Mkhabela, M.
The land spreading of manure can result in significant nitrogen (N) losses to the atmosphere through ammonia (NH3) volatilization. It is estimated that agricultural activities, including manure spreading contribute approximately 50% of the total global NH3 emissions. Computer simulation models have been developed in an attempt to predict NH3 losses...