Innovation: RECEPTivity and amplitude-based transition prediction

Last update: 29.06.2013
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construction technology, civil engineering, aerospace technology, transport
The RECEPT project will deliver upstream aerodynamics research that will contribute (i) to the drive to strengthen the competitiveness of European manufacturing industry, (ii) to the need to improve the environmental impact of aircraft with regards to emissions. Within the RECEPT project, knowledge about transition phenomena and theoretical/numerical tools obtained during the last 50 years since the eN method was proposed, are used to develop the next generation transition prediction methods. The new method will be an amplitude-based prediction method incorporating true effects of the disturbance environment of the incoming flow, the so called receptivity process, as well as knowledge about actual amplitudes at which disturbances breakdown to turbulence. This will largely remove the need for empirical correlations and render possible accurate prediction of the onset of transition both under wind tunnel and free-flight conditions.

Proposed research activities within RECEPT project will also contribute to design of more advanced transition control devices. Consequently, it will contribute to achieving the objectives for technology readiness to reduce fuel consumption and hence emissions. It directly addresses the topic of AAT.2010.1.1.1, AAT.2010.4.1.1 and AAT.2010.4.2.1. The RECEPT consortium consists of 12 organisations from 4 different member states (Sweden, Italy, France Germany) and one of International Cooperation Partner Countries, Russia. It contains 3 aircraft manufacturers (Airbus, SAAB, Piaggio), 5 research organisations (CIRA, DLR, FOI, ITAM, ONERA) and 4 universities (Kungliga Teknika Hogskolan, Universita di Genova, Universita di Salerno, Universitat Stuttgart). Participation of industry will directly transfer the new knowledge and greatly improved method to the more applied work to be performed within the Joint Technology Initiative Clean Sky.
To perform the experimental work, based on the characteristics of the MTL wind tunnel and performed stability analysis, an airfoil has been chosen and modified. Based on this airfoil two different swept-wing models with high-surface quality have been manufactured.

To insure spanwise flow-homogeneity, contours of wind tunnel side-walls for experiments at positive and negative angles of attack have been designed based on the Reynolds-averaged Navier-Stokes (RANS) simulations. So far, the side-walls necessary for the investigation of cross-flow modes receptivity and large roughness elements have been manufactured.

Preliminary measurements with the model and side-wall installed in the wind tunnel has been performed. The purpose of these measurements was to check the flow quality. A comparison of measured and computed pressure distribution showed good agreement.

The necessary instrumentations for generation of controlled roughness elements and generation of free-stream vortical structures have been designed and manufactured. Furthermore, the traversing system has been designed and different prototypes of that have been manufactured.

Direct numerical simulations of large roughness elements in a three-dimensional boundary layer at Mach 0.65 and Reynolds number 6.9 million have been performed to identify the size of critical roughness elements. Simulations show clear differences between the structures created behind sub and super critical roughness elements.

Direct numerical simulations of several low speed (incompressible) cross-flow dominated flows corresponding to the experimental studies from literature have been performed. These simulations include both receptivity to and flow control by means of micron-sized surface roughness elements. Furthermore, preliminary Direct numerical simulation (DNS) for cases corresponding to upcoming RECEPT experiments have been performed.

Literature studies have been performed to identify different relevant flow quantities that can be used to define criteria for transition prediction based on the nonlinear stability analysis.

A number of test cases including DNS and experiments (with detailed measurements of perturbations) from literature have been selected as benchmarks for receptivity and non-empirical transition prediction methods. Flow simulations and preliminary stability analysis have been performed.

To study the effects of flow three-dimensionality, two experiments with transition measurements of three-dimensional wings have been identified. RANS and boundary-layer simulations have been performed to generate the mean flow for three-dimensional stability analysis.
The RECEPT project will deliver upstream aerodynamics research that will increase the accuracy of performance prediction for aircraft with laminar wings, allowing design of advanced and innovative aircraft.

The achievement of the objective will give the aircraft manufacturers within RECEPT confidence that the flight performance of such an aircraft can be predicted prior to aircraft project launch. This new knowledge and the greatly improved next-generation transition prediction methods will be directly transferred to the more applied work to be performed within the Clean sky joint technology initiative, through the participation of AIRBUS and SAAB. They are partner in the present project and also leaders of the smart fixed wing aircraft Integrated technology demonstrators (ITD) of Clean sky, where the new and improved transition prediction tools will be incorporated into the design of the laminar wings.

List of websites: http://www.mech.kth.se/recept

Collaboration sought: N/A

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This innovation is the result of the project

Title: Receptivity And Amplitude-Based Transition Prediction

Acronym: 
RECEPT

Runtime: 
01.02.2011 to 31.07.2014

Status: 
completed project

Organisations and people involved in this eco-innovation.

Please click on an entry to view all contact details.

KUNGLIGA TEKNISKA HOEGSKOLAN

(Sweden)

Role in project: Project Coordination

Contact person: Ms. HORNK Heide

Website: http://www.kth.se

Phone: +46 8 7907128

Contact

AIRBUS OPERATIONS GMBH

(Germany)

Contact person: Mr. TEMMEN Holger

Website: http://www.airbus.com

Phone: +49-4074373238

Contact

CENTRO ITALIANO RICERCHE AEROSPAZIALI SCPA

(Italy)

Contact person: Mr. TAMMARO Federico

Website: http://www.cira.it

Phone: +39-0823623404

Contact

DEUTSCHES ZENTRUM FUER LUFT - UND RAUMFAHRT EV

(Germany)

Contact person: Ms. HEINLEIN Sylke

Website: http://www.dlr.de

Phone: +49-5517092284

Contact

OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES

(France)

Contact person: Prof. CASALIS Grégoire

Website: http://www.onera.fr

Phone: +33-5-62252811

Contact

PIAGGIO AERO INDUSTRIES SPA

(Italy)

Contact person: Dr. MORANDO Alessandro

Website: http://www.piaggioaero.it

Phone: +39-0106481304

Contact

SA KHRISTIANOVICH INSTITUTE OF THEORETICAL AND APPLIED MECHANICS OF SIBERIAN BRANCH OF RUSSIAN ACADEMY OFSCIENCE*ITAM OF SB RAS

(Russia)

Contact person: Prof. KACHANOV Yuriy

Website: http://www.itam.nsc.ru

Phone: +7-3833304278

Contact

SAAB AKTIEBOLAG

(Sweden)

Contact person: Ms. ANDERSSON Camilla

Website: http://www.saabgroup.com

Phone: +46-734183756

Contact

TOTALFORSVARETS FORSKNINGSINSTITUT

(Sweden)

Contact person: Ms. WIKLUND Ingrid

Website: http://www.foi.se

Phone: +46-855503367

Contact

UNIVERSITA DEGLI STUDI DI GENOVA

(Italy)

Contact person: Ms. RIZZO Anna

Website: http://www.unige.it

Phone: +39-0103532522

Contact

UNIVERSITA DEGLI STUDI DI SALERNO

(Italy)

Contact person: Ms. CARACCIOLO Elena

Website: http://www.unisa.it

Phone: +39-089964042

Contact

UNIVERSITAET STUTTGART

(Germany)

Contact person: Dr. KLOKER Markus J.

Website: http://www.uni-stuttgart.de

Phone: +49-71168563427

Contact