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Laminar flow technology

Objective

The reduction of aircraft drag is of major interest to the aeronautical industry. Drag reduction provides clear economic benefits in terms of fuel savings, extended operational range and/or increased payload. In addition, reductions in fuel consumption will have a direct beneficial effect upon environmental pollution levels. The laminar flow concepts offers the largest performance gain of any single technology. Thus the main objectives of this project are to prove the basic concepts of this technology and to prepare the tools, methods and systems required for its successful application to a wide range of practical airframes, from small subsonic commuters to large transonic transport aircraft.
The first phase of the project was successful. All objectives have been reached. The numerical tools developed and experimental data collected in the project will be applied and analyzed in more detail in the ELFIN II project.
Wind tunnel test of the Hybrid Laminar Flow Control (HLFC) concept on a large-scale wing model with perforated leading edge. Two suction philosophies will be investigated; discrete lower surface suction for flow stabilization downstream of minor surface discontinuities, and extensive distributed leading-edge suction for stabilization of high sweep, high Reynolds number flows.
Testing techniques and suction device development for wind tunnel and flight testing. The full exploitation and adaptation of the laminar flow concept relies upon improvements in and modification to existing measurement techniques for use in industrial wind tunnels and under flight conditions. The suction methodology and associated systems as required in the wind tunnel test and also for practical aircraft application will be developed and supplied.
Boundary layer and transition prediction methods for laminar wing design application. Accurate laminar boundary layer calculations are vital for reliable transition prediction. Existing stability codes utilize an empirical correlation for transition prediction. These codes will be extended to include important terms previously neglected. Database methods will be developed as practical and efficient design tools and direct simulation studies will be initiated as a long term solution to transition prediction.
Flight test with Natural Laminar Flow glove. Flight testing of laminar part-span wing glove (on F100 aircraft ), to provide design criteria, wind tunnel correlation and CFD method validation.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Messerschmitt-Bölkow-Blohm GmbH (MBB)
Address
Haidgraben
81611 München
Germany

Participants (23)

ANALYSIS SYSTEMS RESEARCH HIGH-TECH LTD
Greece
Address
67,Argyroupoleos 86
16451 Argyroupolis -Athina
Alenia Aerospazio - Un'Azienda Finmeccanica SpA
Italy
Address
Viale Dell'aeronautica
80038 Pomigliano D'arco - Napoli
Aérospatiale Société Nationale Industrielle SA
France
Address
37 Boulevard De Montmorency
75781 Paris
British Aerospace Plc
United Kingdom
Address
Warwick House
GU14 6YU Farnborough
CENTRO ITALIANO RICERCHE AEROSPAZIALI SCPA
Italy
Address
Via Maiorise
81043 Capua
DASSAULT AVIATION SA
France
Address
Rond-point Des Champs-elysees - Marcel Dassault 9
Paris
Dornier Luftfahrt GmbH
Germany
Address
An Der Bundesstraße 31
88039 Friedrichshafen
EADS - CONSTRUCCIONES AERONAUTICAS S.A.
Spain
Address
Avenida De Aragon 404
Madrid
Fokker Aircraft BV
Netherlands
Address
15,Hoogoorddreef
1100 AE Amsterdam
GERMAN AEROSPACE CENTRE
Germany
Address
Linder Höhe
51147 Koeln
INSTITUTO NACIONAL DE TECNICA AEROESPACIAL ESTEBAN TERRADAS
Spain
Address
Carretera Ajalvir, Km. 4,5
28850 Torrejon De Ardoz
INSTITUTO SUPERIOR TECNICO
Portugal
Address
1,Avenida Rovisco Pais 1
1049-001 Lisboa
Messer Griesheim GmbH
Germany
Address
11,Benzstrasse
82178 Puchheim
Office National d'Études et de Recherches Aérospatiales (ONERA)
France
Address
29 Avenue De La Division Leclerc
92322 Châtillon
Saab AB
Sweden
Address

581 88 Linköping
TECHNICAL UNIVERSITY OF DENMARK
Denmark
Address
Building 307
2800 Lyngby
Technische Hochschule Darmstadt
Germany
Address
Karolinenplatz 5
64289 Darmstadt
Technische Universiteit Delft
Netherlands
Address
1,Kluyverweg
2629 HS Delft
UNIVERSIDAD DE ZARAGOZA
Spain
Address
3,Maria De Luna 3
50015 Zaragoza
UNIVERSIDAD POLITECNICA DE MADRID
Spain
Address
3,Plaza Cardenal Cisneros 3 Ciudad Universitaria
28040 Madrid
UNIVERSITY OF BRISTOL
United Kingdom
Address
University Walk, Queens Building
BS8 1TR Bristol, Clifton
UNIVERSITY OF MANCHESTER
United Kingdom
Address
Simon Building, Oxford Road
M13 9PL Manchester
University College Galway
Ireland
Address

90 Galway