The University of Southampton
Engineering and the Environment

Research project: Minimising the environmental impact of advanced aircraft designs

Currently Active: 
Yes

Contra-Rotating Open Rotor (CROR) aircraft engines are receiving renewed interest lately due to their improved propulsive efficiency when compared with future turbofan designs. However, CRORs exhibit high levels of tonal and broadband noise emissions which are a barrier to their entry into commercial service. Previous studies have assessed and minimised the acoustic signature from CROR designs. Until recently these studies have concentrated on CROR tonal noise due to the added complexities associated with modelling broadband noise. However, recent work has shown that CROR broadband noise significant, and should be better understood. This project uses computational aeroacoustic methods to improve the modelling of CROR broadband noise.

Project Overview

Contra-Rotating Open Rotor (CROR) aircraft engines are receiving renewed interest lately due to their improved propulsive efficiency when compared with future turbofan designs. However, CRORs exhibit high levels of tonal and broadband noise emissions which are a barrier to their entry into commercial service. Previous studies have assessed and minimised the acoustic signature from CROR designs. Until recently these studies have concentrated on CROR tonal noise due to the added complexities associated with modelling broadband noise. However, recent work has shown that CROR broadband noise significant, and should be better understood.
Analytical industrial models exist to predict the broadband noise from CRORs. However, they are forced to make several assumptions. For example, the blade geometry is assumed to be unloaded and infinitely thin.
This project uses computational aeroacoustic methods to improve the modelling of CROR broadband noise. The CAA code known as SotonCAA, which was developed at the University of Southampton, is used to solve the linearized Euler equations to explore the effects of CROR blade geometry on the radiated noise. This will determine the accuracy current industrial models, and will suggest ways that the modelling process can be improved.

Associated research themes

Acoustics
Computational Engineering
Fluid dynamics
Transportation
Airbus Noise Technology Centre (ANTC)

Related research groups

Acoustics Group
Computational Engineering and Design
Aerodynamics and Flight Mechanics

Publications

Key Publications

Staff

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