ALVAR - Advance Laminar Flow Control with Variable Porosity

Fin and porous layer

The ALVAR project aims at demonstrating technology readiness level of four for a novel suction skin structure, the tailored skin single duct (TSSD). That is, the technology must be thoroughly tested at representative conditions in a large laboratory. DLR manufactures therefore a suction nose to be tested on a full-scale wind tunnel model of a vertical fin that replicates the surface pressure distribution and Reynolds number of an A320 fin at cruise conditions. If successful, the ALVAR project will pave the way for introducing the technology to the wings and tail surfaces of large future commercial aircraft. That could reduce the fuel consumption by 12-15%, with similar savings on the greenhouse effect of the Earth’s atmosphere.


Prof. Dr.-Ing. Rolf Radespiel

Institut für Strömungsmechanik

Hermann-Blenk-Straße 37

38106 Braunschweig


ALVAR Wind Tunnel Test Completed

In February 2022, the wind tunnel tests of the TSSD concept on a full-scale vertical tail plane model were successfully conducted at DNW-LLF.

TSSD flat plate tests successful

The effectiveness of the TSSD concept for laminar flow control was tested successfully on a flat plate in DNW-NWB in Braunschweig.

ALVAR - Lift-Off!

News Article from Clean Sky 2 JU on the project start of ALVAR