Velocity measurements using high-repetition-rate stereoscopic PIV make it possible to observe the largescale dynamics of jet turbulence in a wind tunne, opening the way to progress in the understanding of jet noise generation... With the stereoscopic installation it has been possible to measure the three components of the velocity in a plane transversal to the flow, thus allowing experimental access to the largescale dynamics of turbulence
[for largescale simulation] Technique for solving turbulent flow equations, where the largescales of motion are solved explicitly, while small scales (smaller in size than the calculation mesh) are modeled by" an eddy viscosity" term. Share
Onera has participated in a largescale ground vibration testing program on an A340 600 and has validated new means and methods suitable for large aircraft... During the months of March and April 2011, in close collaboration with the German Aeroelasticity Institute of the DLR and Airbus, Onera participated in a largescale testing program with an A340 600 as a structural test bed
Low speed tests with non aeronautical related largescale models (train, sail boat, car, chair-lift, buildings). For no conventional test, please contact directly by e-mail wind tunnel division team (use contact button), we will study your project together
The aeroacoustic simulations are thus based on flow calculations (CFD), most often based on the method of simulation of largescales or LES2 (Large Eddy Simulation), and its hybrid variants RANS3 / LES, such as ZDES4 (Zonal Detached Eddy Simulation) ... Technique for the solving of turbulent flow equations in which the largescales of movement are solved explicitly while the small scales (smaller that the calculation meshes) are modeled by" a vortical viscosity" term
These tests, performed on a largescale model, are part of the European project NICETRIP, of which the purpose is to study the technological feasibility of a civilian convertible aircraft. Future projects should allow a flight demonstrator to be made in Europe
In addition to some isolated applications dedicated to environmental issues (for example, the identification of energy losses from buildings, the determination of surface water stock and the determination of renewable energy production potential), the focus will be particularly on services resulting from gathering data over extensive areas and/or areas with complex geometries (metropolitan dynamics, the functioning of largescale agricultural and forestry operations and natural resource management)
Up to now, the studies have concentrated on flames with a power of about one kilowatt and now the transition must be made to a largerscale, 100 kW, or even one megawatt, closer to the characteristics of aircraft engines. In addition, research carried out on a real combustion chamber should enable the researchers to analyze the products of combustion, in order to evaluate the effect of the plasma on the amount of pollutant emissions