Periodic Reporting for period 2 - SALUTE (Smart Acoustic Lining for UHBR Technologies Engines)
Reporting period: 2020-01-01 to 2021-02-28
The SALUTE project will tackle these challenges by developing a new acoustic liner technology based on arrays of small loudspeakers or passive membranes. This innovative approach is able to deliver excellent sound absorption at low frequencies while remaining sufficiently small to fit into thin nacelle geometries. This development will be carried out on three different concepts, which will be compared and down-selected in the course of the project.
Conventionally, these acoustic treatments were tested using 2D (i.e. flat) prototypes, which will constitute a baseline configuration of the project. The SALUTE project will go further by testing 3D prototypes with a geometry corresponding to a small-scale fan at the PHARE test facility. This is required to reach TRL4, but will present specific challenges in terms of manufacturing. Secondly, gaining more insight into the physical interaction between the transducers, the control system and the high-speed flow will be necessary. This will be achieved through multi-physics simulations coupling all these sub-systems.
The works carried out on the second period of SALUTE project was dedicated to the fabrication and first experimental characterizations of the 2D liners and the development of the associated numerical tools. The most important deliverable of this period is the electro-active liners with all functional cells that has been characterized on dedicated tube with flow. The second defined technology has also been validated by CDR and it will be ready for NLR test in the next few days. In parallel a strong effort was devoted to numerical developments in order to furnish tools for future 3D implementation.
The measures to maximize impact will really starts after the acoustic characterization of our 2D liner prototype especially with the aero acoustic test in July 2020. Some specific papers are already proposed for conference publication and workshop pointed out specific tools and results firstly obtained.