Aeroacoustics of Ducted and Open-rotor Propulsion SYStems – ADOPSYS

The present project of industrial Chair ADOPSYS is focused on advanced studies on the aerodynamic noise from modern propulsion systems in aeronautics. This includes very high by-pass ratio turbofan engines, for which the main contributors to the noise are the fan stage and the jet, as well as counter-rotating open rotors or more generally advanced unducted propulsion systems. The Chair is aimed at addressing the reduction of aerodynamic sound sources of these systems by means of improved understanding and modelling of all underlying generating mechanisms. Indeed deeper investigations of the sources encountered in rotating blade technologies are needed to provide background knowledge for low-noise design. Similar technologies such as high-speed fans for air-conditioning, or centrifugal compressor architectures, will be also impacted by the advances. The emphasis will be on balanced efforts in fundamental research by the laboratory about the mechanisms, on the one hand, and transmission of knowledge and know-how to the industrial partner, on the other hand. The Chair will be hosted by LMFA (Laboratoire de Mécanique des Fluides et Acoustique) of ECL (Ecole Centrale de Lyon) and the industrial partner is the engine developer SNECMA (SAFRAN Group). The LMFA contributes through its recognized knowledge of aeroacoustic modelling using analytical techniques and high-resolution computational methods, as well as by carrying out basic experiments on fundamental aspects in its open-jet anechoic facilities or on a small-scale fan test bench. The Chair holder will be a full professor recruited from abroad. The scientific program is organized in five technical work packages addressing ducted rotating-blade noise, open rotor aeroacoustics, jet noise, advanced measurement techniques and know-how transmission. The Chair will partly operate as a scientific support of the EquipEx PHARE. The final objective, apart from gathering fundamental knowledge, is to increase the competitiveness of the partner and to reduce noise impact around airports according to the ACARE objectives.