Numerical investigation of the true sources of jet noise
Lead Research Organisation:
University of Southampton
Department Name: Faculty of Engineering & the Environment
Abstract
Aircraft noise severely impacts the quality of life of residents living near airports and is a problem that will become even more pressing in future, with air traffic forecast almost to double over the next two decades. One of the dominant sources of aircraft noise is jet noise, particularly during take off. Jet noise reduction technology is largely empirical and further progress depends on the better understanding of the mechanisms of sound production. In this project the physics of sound production will be explored by examining the structure and dynamics of the true sources of sound. The numerical technique involves splitting the flow-field in a jet into radiating (acoustic) and non-radiating (base-flow) components. The non-radiating base flow is obtained by filtering the Navier-Stokes equations in space and time. It is shown that for a particular choice of filter function the time filtering can be performed analytically. The base flow can then obtained by large-scale computations using spatially-filtered direct numerical simulation. The radiating component is governed by linear equations and almost entirely generated by known sources. The sources are calculated from base flow computations and they contribute only to the production of sound. We refer to these sources as the true sources of sound. We aim to produce a numerical technique to understand the physics of the noise generation process.
People |
ORCID iD |
Anurag Agarwal (Principal Investigator) | |
Zhiwei Hu (Co-Investigator) |
Publications
SINAYOKO S
(2010)
Flow decomposition and aerodynamic sound generation
in Journal of Fluid Mechanics
Sinayoko S
(2010)
Flow filtering and the physical sources of aerodynamic sound
in Procedia Engineering
Anurag Agarwal
(2010)
On computing the physical sources of jet noise
Sinayoko S
(2011)
Physical sources of sound in laminar and turbulent jets
Sinayoko S
(2010)
Reprint of: Flow Filtering and the Physical Sources of Aerodynamic Sound
in Procedia IUTAM
Sinayoko S
(2012)
The silent base flow and the sound sources in a laminar jet.
in The Journal of the Acoustical Society of America
Description | We developed a new numerical technique to identify the true sources of sound in a jet. |
Exploitation Route | Help find the true sources of aerodynamic noise in other applications like wind turbines, airframe noise, etc. |
Sectors | Aerospace, Defence and Marine,Energy,Transport |
Description | EPSRC |
Amount | £30,219 (GBP) |
Funding ID | PhD Plus Award (KR03008362, 1971107) EP/P502756/1 |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 10/2010 |
End | 09/2011 |