Vianney Masson

Ecole Centrale de Lyon | ECL · Département Mécanique des Fluides - Acoustique - Energétique - MF.A.E.

Rotor-Stator Interaction (RSI) noise predictions using analytical models have become a first hand approach to perform quick and efficient noise assessments. However, a large range of models using different assumptions is currently available and it is of paramount interest to investigate what their impact on the predictions are and how representativ...

Sound transmission through a finite lined section in a rigid annular duct with swirling and sheared mean flow is analyzed with a new mode-matching method based on the conservation of the total enthalpy and the mass flow, which does not reduce to the conservation of the pressure and the axial velocity when the swirl is non zero. It relies on a new p...

The acoustics of a straight annular lined duct containing a swirling mean flow is considered. The classical Ingard-Myers impedance boundary condition is shown not to be correct for swirling flow. By considering behaviour within the thin boundary layers at the duct walls, the correct impedance boundary condition for an infinitely thin boundary layer...

This paper gives a modified Myers boundary condition in swirling inviscid flow, which differs from the standard Myers boundary condition by assuming a small but non-zero boundary layer thickness. The new boundary condition is derived and is shown to have the correct quadratic error behaviour with boundary layer thickness and also to agree with prev...

Future aircraft architecture may involve ultra high bypass ratio engines (UHBR), associated with large diameters which will require a shorter nacelle. As a result, the relative weight of the interstage liner, liner between fan and outlet guide vanes (OGV), may become more significant compared to the inlet liner. The mean flow in the interstage regi...

This presentation will focus on calculating the modes and Green’s function for swirling flow in an finite duct. We will consider solutions to the linearised Euler equations for a compressible, perfect gas which will be either homentropic or isentropic. The base flow velocity will be have both varying shear and swirl. The duct will have hard walls o...

The present study aims at addressing the effect of a swirling and sheared mean flow on the behavior of the liners in an annular duct. When the swirl is non zero in the vicinity of the wall, it is shown that the classical Myers boundary condition is no longer the correct limit for infinitely thin boundary layers. Indeed, centrifugal effects shall be...

Broadband noise produced by the trailing edge of a controlled diffusion (CD) airfoil with a serrated trailing edge in the actual anechoic wind-tunnel test configuration is directly simulated using a Lattice-Boltzmann method for the first time at a high Reynolds number of 1.5 105 typical of actual ventilation systems and low pressure turbomachinery...