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Advance Laminar Flow Control with Variable Porosity

European Union
Geo-spatial type
Total project cost
€794 125
EU Contribution
€794 125
Project Acronym
STRIA Roadmaps
Vehicle design and manufacturing (VDM)
Transport mode
Airborne icon
Transport policies
Other specified
Transport sectors
Passenger transport,
Freight transport


Link to CORDIS

Laminar Flow Control by means of a suction system appears to be one of the most promising technologies to significantly reduce the pollutant emission of modern large transport aircraft through drag reduction. The consortium, composed of a renowned University (TUBS) and world leading wind tunnel provider DNW, will perform high-quality large-scale wind tunnel tests with a full-scale vertical tail plane equipped with a hybrid laminar flow control (HLFC) system, which is based on the tailored skin single duct (TSSD) concept.

The DNW-LLF is one of the world’s largest low speed facilities and offers unique capabilities for wind tunnel tests with large scale models at representative flow conditions. The framework provided for by ALVAR includes state-of-the-art data acquisition, aerodynamic data, lift, drag, static pressure distributions, transition location with infrared and hot films, and the extremely high flow quality of the LLF 8x6 m test section configuration.

One of the root problems in wind tunnel tests with hybrid laminar flow control is that it is technically unfeasible to actually measure the local suction flow rate over individual surface areas, but only the overall suction flow rate including a number of additional values, such as pressures at certain locations, is feasible. However, the local flow rate can be post processed based on a complex measurement chain, employing data mappings (e.g. calibration of the suction skin) and interpolation/extrapolation schemes. This makes the local flow rate prone to the propagation of uncertainties and errors. ALVAR will therefore provide a scientific analysis of the whole measurement chain to establish a precise uncertainty of the local flow rate.

Based on this, and through analysis, the design, optimization and implementation of the main mass flow meter including a proven pumping system to provide stable suction rates a comprehensive quantification of boundary layer suction will be performed by ALVAR.


Parent Programmes
Institution Type
Public institution
Institution Name
European Commission
Type of funding
Public (EU)
Specific funding programme
Other Programme
JTI-CS2-2019-CFP10-AIR-01-43 Verification of advanced simplified HLFC concept with variable porosity


Lead Organisation
Technische Universitaet Braunschweig
Pockelsstrasse, 38106 Braunschweig, Germany
Organisation website
EU Contribution
€243 500
Partner Organisations
Stichting Duits-Nederlandse Windtunnels
VOORSTERWEG 31, 8316 PR Marknesse, Netherlands
Organisation website
EU Contribution
€550 625


Technology Theme
Computer-aided design and engineering
Improvement of transition-prediction tools for future laminar flow aircraft
Development phase

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