The UHURA (Unsteady High-Lift Aerodynamics – Unsteady RANS Validation) project focuses on the research of the aerodynamic characteristics of the Krueger flap device , its dynamic load from the aerodynamic forces and, last but not least, the validation of CFD methods for non-stationary flow field and the load during the flap retraction and insertion. Both CFD simulations and wind tunnel experiments will be performed. The results obtained will be compared and analyzed in detail. It is assumed that by the better knowledge of the flow field and the flap load, the weight of the flap as well as the kinematic mechanism will be reduced, thereby reducing fuel consumption and CO2 and NOX emissions.
VZLU will perform CFD simulations and analysis of local flow field of the Krueger flap during deployment. The structural deformation of the Krueger flap under the aerodynamic loads will be part of the considerations. The mesh deformation together with local re-meshing will be used to obtain a valid CFD mesh during the deployment. The local flow separation and cove vortex will be studied in detail by hybrid RANS-LES method for special cases of characteristic positions of the Krueger flap. The obtained results will be compared with the experimental data and also with the results of other partners within WP4.2, lead by VZLU. The obtained results will increase knowledge of the phenomena of unsteady flowfield and vortices of the Krueger flap during deployment.
The total European Commission grant for this project is about 6.1 million EUR, of which 223 thousand. EUR is the budget for VZLU. Project coordinator is DLR, other major participants are Airbus and ASCO, as well as EU research organizations ONERA, FOI, TSAGI, INTA etc. The project will start on 1st September 2018 and lasts for a total of 36 months.