Reducing the noise of jet engines
Researchers developed tools that enabled the aerospace industry to study and improve techniques for reducing the level of noise emitted by aeroplanes. The project built on the success of the previous JEAN (Jet exhaust aerodynamics and noise) project, designing quieter aircraft and promoting Europe's aeronautics industry in the global market place. Project partners identified and improved computational fluid dynamics (CFD) techniques for optimising jet flow from coaxial nozzles with random geometry. Most methods currently used for noise prediction are based on databases of experimental results. However, these are of limited use for determining new noise reduction technologies. The COJEN project faced this challenge by developing techniques for predicting the turbulence characteristics of jet nozzles, which are associated with the generation of noise. By designing quieter aircraft Europe's aircraft industry has responded to the public's demand for more environment friendly aircraft. Furthermore, the COJEN project helped the aeronautics industry to compete in the global marketplace by developing new products more quickly and cheaply.
