Obiettivo The objectives of the project are:Experimental investigations of the turbulence level and scale effect on the near vortex wake characteristics;Processing of available database of flight tests;Theoretical investigations of the turbulence level and scale effect on the near and far vortex wake characteristics;There are some experimental data, which permit one to conclude that the external flow turbulence influences the aircraft wake significantly. The turbulence parameters, which are of importance for this effect, are the turbulence level and scale.It should be noted that the stochastic properties of the external turbulence for a wind tunnel flow and the free atmosphere are quite different. So the results of wind tunnel experiments should be interpreted as real flight aircraft characteristics with a great caution. The effect under consideration takes place both in the near and far wake. In the near wake the external turbulence changes the distance of vortex merging and sizes of turbulent cores of wake vortices. In the far field the wake lifetime and circulation loss strongly depend on the external turbulence.It is proposed to study the effect of external turbulence on vortex wake both experimentally and theoretically.In the low speed wind tunnel AT-1 (Moscow Institute of Physics and Technology) the turbulising mesh properties will be investigated. There are some reasons that the diameter of mesh wire defines the level of turbulence whereas the mesh size fixes the turbulence scale. The series of wire meshes will be tested with the aid of hot-wire anemometer measurements. Both velocity fluctuation and correlation dependencies will be measured. The test section of the wind tunnel AT-1 is small enough (170´170 mm). So analogous investigations will be repeated in TsAGI's T-124 wind tunnel with much greater test section (1000´1000 mm). As a result of these investigations we get the correlation between the turbulizing mesh parameters and turbulence characteristics for two different wind tunnels.The wake characteristics of the aircraft model with flapped wing will be studied experimentally both in T-124 and AT-1 wind tunnels at various flow turbulence levels and scales. Both fluctuating and integral wake characteristics will be measured.Processing of available database of flight tests is planned too. The experiments were done some years ago during flybys of different types of aircraft near the meteorological tower.The theoretical model of turbulent flow field in the wind tunnel will be created with taking into account the experimental results obtained. We have now such a model for the free atmospheric turbulence. Comparison of these two different stochastic models will be done. The results to be obtained will be important for interpreting the wind tunnel experiments with vortex wakes.Finally, the near and far wake evolution depending on atmospheric turbulence level and scale will be studied by means of computer simulation. It is proposed also to study the far wake characteristics, which are under the action of crosswind and engine jets. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 6 - Engineering Sciences, Aeronautics, Space AIRBUS - AIRBUS Industries Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore DaimlerChrysler Aerospace Airbus Contributo UE Nessun dato Indirizzo Hünefeldstra?e 1 - 5 28199 Bremen Germania Mostra sulla mappa Costo totale Nessun dato Partecipanti (6) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Airbus UK Ltd. Regno Unito Contributo UE Nessun dato Indirizzo Filton House BS99 7AR Bristol Mostra sulla mappa Costo totale Nessun dato Aérospatiale Matra - Airbus Francia Contributo UE Nessun dato Indirizzo 316, route de Bayonne 31060 Toulouse Cedex 03 Mostra sulla mappa Costo totale Nessun dato Central Aerohydrodynamics Institute (TsAGI) Russia Contributo UE Nessun dato Indirizzo Zhukovsky Street, 1 14160 Zhukowsky, Moscow Region Mostra sulla mappa Costo totale Nessun dato Military Aviation Technical University Russia Contributo UE Nessun dato Indirizzo 3, Planetnay 125190 Moscow Mostra sulla mappa Costo totale Nessun dato Scientific and Technical Center of Flight Research Institute Russia Contributo UE Nessun dato Indirizzo 140160 Zhukovsky-2 Mostra sulla mappa Costo totale Nessun dato State University Russia Contributo UE Nessun dato Indirizzo 16, Gagarin Street 140160 Zhukowsky, Moscow Region Mostra sulla mappa Costo totale Nessun dato
