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Study of Noise and Aerodynamics of Advanced Propellers

Objective

The long-term objective of the SNAAP project is to enable The European aircraft industry to design quieter propeller-driven aircraft providing for improved passenger comfort and reduced environmental noise.

For propeller-driven systems, considerable effort is required to understand the mechanisms responsible for the noise generation on the propeller blade and for the associated mathematic modelling.

The main objectives of this project are:

the identification of the acoustic sources on advanced propeller and propfans,
modelling the mechanisms responsible for the sound generation and its propagation,
development and validation of an aeroacoustic code capable of predictions of propeller noise in the near field and far field.

To achieve this, two propeller configurations will be investigated. The first will be an advanced propeller designed for a cruise Mach number of 0.7 and the second a swept propfan type operating at a cruise Mach number of 0.8 such as has been designed during the pilot phase of the Brite/Euram Gemini project.

The proposed objectives will be accomplished by a series of specific tasks which will address the required theoretical and experimental development aspects and will define the scaling philosophy, the design, manufacture and instrumentation of propeller models capable of withstanding the stress due to the test conditions. In addition, the testing procedures and techniques for the analysis of the acoustic, aerodynamic and vibration data to be acquired in the tests will be established. In parallel with this the theoretical activity will develop both an aerodynamic and an acoustic code. The former will be based on Euler techniques and will provide input data essential for the acoustic code. The acoustic code will comprise of several modules each of which will account for different acoustic sources. Techniques for identifying the different acoustic sources from the test data will be developed. The codes will be validated and refined using the experimental data.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Alenia Aerospazio - Un' Azienda Finmeccanica SpA
Address
Viale Dell'aeronautica 1
80038 Pomigliano D'arco
Italy

Participants (15)

Aircraft Research Association Ltd
United Kingdom
Address
Manton Lane
MK41 7PF Bedford
Aérospatiale Société Nationale Industrielle SA
France
Address
316 Route De Bayonne
31060 Toulouse
Centro Italiano Ricerche Spaziali SpA
Italy
Address
Via Maiorise - Localita Silvagni
81043 Capua
Dornier Luftfahrt GmbH
Germany
Address
An Der Bundesstraße 31
88039 Friedrichshafen
Dowty Defence and Air Systems Ltd
United Kingdom
Address
Anson Business Park Cheltenham Road
GL2 9QN Gloucester
Fokker Aircraft BV
Netherlands
Address

1117 ZJ Schiphol Oost
Hoffman Propellers
Germany
Address
Küpferlingstraße 9
83022 Rosenheim
IBK INGENIEUR BUERO - DR GUENTER KRETZSCHMAR
Germany
Address
Eichendorffstrasse 120
90491 Nuernberg
Instituto Superior Técnico
Portugal
Address
Av. Rovisco Pais
1096 Lisboa
Nationaal Lucht- en Ruimtevaart Laboratorium
Netherlands
Address
31,Voorsterweg
8316 PR Marknesse
Office National d'Études et de Recherches Aérospatiales (ONERA)
France
Address
29 Avenue De La Division Leclerc
92322 Châtillon
RATIER-FIGEAC SA
France
Address
Route De Cahors
46101 Figeac
Stichting Duits Nederlandse Windtunnel
Netherlands
Address

8300 AD Emmeloord
THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH NEAR DUBLIN HEREINAFTER TRINITY COLLEGE DUBLIN
Ireland
Address
Parsons Building, Trinity College
2 Dublin
University College Galway
Ireland
Address

90 Galway