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TRIMIS

Computation of Coaxial Jet Noise

PROJECTS
Funding
European
European Union
Duration
-
Status
Complete with results
Geo-spatial type
Other
Total project cost
€5 691 810
EU Contribution
€3 700 000
Project Acronym
COJEN
STRIA Roadmaps
Vehicle design and manufacturing (VDM)
Transport mode
Multimodal icon
Transport policies
Decarbonisation,
Societal/Economic issues
Transport sectors
Passenger transport,
Freight transport

Overview

Call for proposal
FP6-2002-AERO-1
Link to CORDIS
Background & Policy context

This was an EU FP6 project with the overall goal of increasing knowledge about noise generation and noise reduction mechanisms as well as validating noise prediction tools for coaxial jets. The project built to a large extent on the previous FP5 project 'JEAN' (Jet Exhaust Aerodynamics and Noise).

Despite the progress in the development of CFD solvers, most of the noise prediction methods currently in use in the aerospace industry were correlations based on empirical databases. These were of very limited practical use for assessing the impact of novel noise reduction techniques on aircraft noise. A more explicit approach was required in which changes to the flow would be explicitly predicted and properly linked to the production of noise.

Significant advances have recently been made towards developing aeroacoustic methods which use CFD results as the input for prediction of the acoustic fields generated by exhaust flows. In Europe, much of this progress was initially made within the 5th Framework project 'JEAN', and some good progress has also been made in national programmes. However, these projects have concentrated mainly on fairly fundamental or limited cases. The industrial requirement is to predict the noise from complex geometries such as coaxial jets with pylons, and from noise reduction devices such as forced mixers and serrated nozzles.

Objectives

The principle objective of CoJeN was therefore:

  • to develop and validate prediction tools which can be used by the aerospace industry to assess and optimise jet-noise reduction techniques.

In order to bring the methods developed in JEAN and the national programmes to the point where they are useful to industry, the methods had to be extended to cope with hot coaxial jets and arbitrary nozzle geometries. The methods also had to be validated to demonstrate their accuracy and reliability.

Accordingly, the specific technical objectives of the project were:

  • to identify and improve optimal CFD techniques for the prediction of jet flow development from coaxial nozzles of arbitrary geometry
  • to develop aeroacoustic codes which can predict the acoustic fields from the CFD results
  • to acquire aerodynamic and acoustic data with which to validate these codes
Methodology

In CoJeN, CFD techniques for the prediction of the turbulence characteristics of coaxial jets were developed and validated. These were linked to noise source generation and propagation models for the prediction of the near- and far-field noise. The results from these were critically evaluated against data, which was be obtained from a series of carefully designed experiments.

The project was divided into the following steps:

  • Project management, specifications and assessment
  • Flow prediction
  • Acoustic source generation & propagation modelling
  • Acquisition of validation data

that included these tasks:

  • project management, specifications and assessment;
  • flow prediction;
  • Reynolds Averaged Navier-Stokes (RANS) techniques;
  • Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) techniques;
  • Vortex methods;
  • technology transfer;
  • acoustic source generation and propagation modelling;
  • acoustic analogies;
  • direct methods;
  • hybrid methods;
  • acquisition of validation data;
  • advanced measurement techniques;
  • single and multi-point flow measurements;
  • whole field flow measurements;
  • acoustic measurements;
  • testing and data reduction.

Funding

Parent Programmes
Institution Type
Public institution
Institution Name
European Commission
Type of funding
Public (EU)

Results

Identification and improvement of optimal CFD techniques for the prediction of jet flow development from coaxial nozzles of arbitrary geometry:

A number of different CFD techniques have been investigated and developed, and their use and limitations with respect to jet aerodynamics and noise prediction is now much better understood. Expertise in the use of these techniques has been transferred to the industrial partners.

Development of aeroacoustic codes which can predict the acoustic fields from the CFD results:

Improved acoustic analogy methods, validated direct methods, (LES, DES) and Hybrid methods have been developed.The partners now have access to a range of methodologies to suit particular applications. Some possible alternative approaches have also been investigated and excluded as unsuitable.

Acquisition of aerodynamic and acoustic data with which to validate these codes:

An extensive test campaign has been successfully completed, using novel and advanced measurement and processing techniques to extract maximum value.

A large database is now available to support further development and validation. This data will continue to be processed and used beyond the end of the project.

Partners

Lead Organisation
Organisation
Qinetiq Limited
Address
85 Buckingham Gate, 2nd Floor, LONDON, United Kingdom
Organisation website
Partner Organisations
Organisation
Technische Universitaet Berlin
Address
17-19,Salzufer 17-19, 10587 BERLIN, Germany
Organisation website
EU Contribution
€0
Organisation
Chalmers Tekniska Hogskola Ab
Address
Sven Hultinsgata 2, GOETEBORG, Sweden
EU Contribution
€0
Organisation
Rolls Royce Plc
Address
65 Buckingham gate, LONDON, SW1E 6AT, United Kingdom
Organisation website
EU Contribution
€0
Organisation
Integrated Aerospace Sciencees Corporation (Inasco)
Address
Miaouli St., 22, MOSCHATO - ATHENS, Greece
Organisation website
EU Contribution
€0
Organisation
Universidad Carlos Iii De Madrid
Address
Calle Madrid, 28903 Getafe (Madrid), Spain
Organisation website
EU Contribution
€0
Organisation
Loughborough University
Address
Ashby Road, Loughborough, LE11 3TU, United Kingdom
Organisation website
EU Contribution
€0
Organisation
Universite De Poitiers
Address
Rue de l' Hotel Dieu, 15, 86034 POITIERS, France
Organisation website
EU Contribution
€0
Organisation
Universidad Politécnica De Madrid
Address
Avda. Ramiro de Maeztu, 3, 28040 MADRID, Spain
Organisation website
EU Contribution
€0
Organisation
Dassault Aviation
Address
9, Rond-Point des Champs-Elysées - Marcel Dassault, 75008 PARIS, France
Organisation website
EU Contribution
€0
Organisation
The University Of Warwick
Address
Gibbet Hill Road, COVENTRY, United Kingdom
EU Contribution
€0
Organisation
Centre National De La Recherche Scientifique
Address
3 rue Michel-Ange, 75794 PARIS, France
Organisation website
EU Contribution
€0
Organisation
The Provost Fellows And Scholars Of The College Of The Holy And Undivided Trinity Of Queen Elizabeth Near Dublin (Hereinafter Called Tcd)
Address
College Green, DUBLIN, 2, Ireland
Organisation website
EU Contribution
€0
Organisation
Rolls-Royce Deutschland Ltd & Co Kg
Address
Eschenweg 11, 15827 BLANKENFELDE-MAHLOW, Germany
EU Contribution
€0
Organisation
Inasco- Integrated Aerospace Sciences Corporation O.e.
Address
Parque Tecnológico de Zamudio, Nº 300, ZAMUDIO (VIZCAYA), Greece
Organisation website
EU Contribution
€0
Organisation
Volvo Aero Corporation
Address
Flygmotorvägen, TROLLHÄTTAN, Sweden
Organisation website
EU Contribution
€0
Organisation
Office National D' Etudes Et De Recherches Aérospatiales
Address
29, avenue de la Division Leclerc, BP72 CHÂTILLON CEDEX, France
Organisation website
EU Contribution
€0
Organisation
The European Association Of Aerospace Industries
Address
Gulledelle 94, b5, 1200 BRUXELLES, Belgium
Organisation website
EU Contribution
€0
Organisation
Deutsches Zentrum Fr Luft Und Raumfahrt E.v
Address
Linder Hoehe, 51147 KOELN, Germany
Organisation website
EU Contribution
€0
Organisation
University Of Southampton
Address
Highfield, Southampton, SO17 1BJ, United Kingdom
Organisation website
EU Contribution
€0
Organisation
Rheinisch-Westfaelische Technische Hochschule Aachen
Address
Templergraben, 52062 Aachen, Germany
Organisation website
EU Contribution
€0
Organisation
University Of Bath
Address
Claverton Down, Bath, BA2 7AY, United Kingdom
EU Contribution
€0
Organisation
Ecole Centrale De Lyon
Address
AVENUE GUY DE COLLONGUE 36, 69134 ECULLY, France
Organisation website
EU Contribution
€0
Organisation
Centrale Lyon Innovation
Address
Chemin des Mouilles, 64, ECULLY, France
EU Contribution
€0

Technologies

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