"The activities have been progressed in line with the project plan and complying with the project objectives. The main activities and achievements attained in the reporting period are summarized below.
- Project progress meetings have been well scheduled and coordinated. All the contractual documents have been signed on time. Increasing activities observed in “dissemination and exploitation” of the project results. The Project has established its own website, used for storing/transferring data and files, and further for “knowledge preservation”.
- The fundamental Test Cases (TC), TC01 (Tandem cylinders), TC02 (Wing mock-up) and TC03 (Acoustic liners), have been well defined and documented, w./w.o. noise control strategies (plasma, turbulence screen and acoustic liner) implemented. Experiments and numerical analysis have been being conducted for baseline TCs. Numerical analysis has also been conducted for TC04 (Wing/Engine-jet installation).
- The activities have been remarkably progressed in developing high performance acoustic measurement techniques include a noise source localization tool, a duct Modal Decomposition Method (MDM) and a liner impedance technique.
- The acoustic liner impedance eduction technology has been further upgraded. The parameters of targeted liners have been determined and adopted in manufacturing liner samples, which have been used in experiments for characterizing liner impedance, supporting consequently impedance modelling development. The design of the different experimental facilities has been completed, of which most are in operation for measuríng the test cases subjected to noise control.
- The data from the experiment of TC02 baseline configuration, performed from a previous project, have been collected and re-documented, which have been being used in validation of CFD/CAA methods.
- In the simulation for the baseline cases the CFD/CAA methodologies and tools have been well demonstrated and verified. Development of advanced numerical methods and modelling approaches has been undertaken, including, among others, high-order numerical scheme for predicting noise propagation, advanced turbulence models for robust formulation of noise generation. For effective numerical analysis of noise-control technologies, new numerical modelling methods for, respectively, plasma, turbulence screen and acoustic liner, have been proposed and are undergoing implementation and validation.
- In studies of low-noise concepts and aero-acoustic optimization, the numerical solver and optimization techniques, as well as their coupling, have been re-adapted and improved. Low-noise concepts have been proposed and investigated, showing noticeable noise reduction, as demonstrated in CFD/CAA computations and in experimental investigation.
- In addressing the (wing/engine-jet) installation effect, the CFD/CAA methods have been undergoing further improvement and verification. The improvement and verification of acoustic optimization methods have been reported and demonstrated in minimizing airfoil trailing-edge noise reduction.
- Two important documents have been prepared and finalized, led by industrial partners, concerning, respectively, “Definition of assessment criteria” and the “Templates and structure of Best Practice Guidelines (BPG)”. This has paved the way towards a relevant technical assessment and establishing ""Best-Practice Guidelines"" serving potential industrial use."
