This project aims to study the turbulent flow over acoustic liners with a particular focus on the effect of Mach number.
Acoustic liners are state-of-the-art technology for noise reduction over aircraft engines, but they have the drawback of increasing aerodynamic drag.
The PI has been working on this topic for the past two years, also with the aid of PRACE resources, which allowed the group to perform unprecedented simulations and to develop a theory to predict aerodynamic drag from the liner geometry.
This is an important result for the understanding of turbulent flows over porous surfaces and a key finding for the design of acoustic liners. In this project, we propose to study turbulent boundary layers over acoustic liners in the presence of incoming acoustic waves.
The group is already developing a dataset for this flow at a low Mach number and we request resources to study the same flow at a higher speed, to have a complete overview of the flow conditions occurring in the flight envelope of commercial aircraft.
The project results will expand our knowledge of compressible flows over porous surfaces, and help us design more efficient acoustic liners which reduce noise with a reduced drag penalty.
Delft University of Technology, Netherlands