| Autor(en) | Kauth, Felix | Narjes, Gerrit | Müller, Jan | Seume, Jörg | Vasista, Srinivas | Müller, Thomas | Francois, Daniela | El Sayed, Yosef | Semaan, Richard | Behr, Christian | Schwerter, Martin | Leester-Schädel, Monika | Nolte, Felix | Giesecke, Daniel | Atalayer, Caglar | Radespiel, Rolf |
|---|---|
| Titel | Progress in Efficient High-Lift |
| Herausgeber | AIAA AVIATION Forum, 35th AIAA Applied Aerodynamics Conference, Denver, 2017 |
| Erscheinungsjahr | 2017 |
| Abstract | This paper presents some of the progress in research on efficient high-lift systems for future civil aircraft achieved by the Coordinated Research Centre CRC 880 sponsored by the German Research Foundation. Several new approaches to increasing the lift are applied as part of the design of a reference aircraft with short take-off and landing ca- pability: The numerically predicted positive effect of Coanda jet blowing at the trailing edge flap is validated in water tunnel experiments. Robust miniature pressure and hot- film sensors are developed for the closed-loop control of a piezo-actuated blowing lip. A flexible leading-edge device utilizes composite materials, for which new structural designs are developed. Additionally, a potential de-icing system, as well as a lightning-strike pro- tection are presented. A high power-density electrically driven compressor with a broad operating range is designed to provide the blowing airflow. Different propulsion systems for the reference aircraft are evaluated. An ultra-high bypass ratio engine is considered to be most promising, and thus a preliminary fan stage design process is established. The rotor dynamic influences of the engine on the aircraft structure are investigated through a hybrid approach using a multibody model and modal reduction. |
| Autor(en) | Botelho e Souza, Ana Carolina | Kumar, Pradeep | Radespiel, Rolf | Mößner, Michael |
|---|---|
| Titel | Numerical Simulation of Airfoil Flows with Porous Surface Segments using an Eddy-Viscosity Model |
| Herausgeber | Deutscher Luft- und Raumfahrtkongress, 13.-15. September 2016, Braunschweig, Germany |
| Erscheinungsjahr | 2016 |
| Abstract | This paper summarizes the results of the validation and calibration of a two-equation turbulence model for VRANS simulations of flow through porous media. The results herein are a continuation of a previous work during which a numerical model based on VRANS equations with a Reynolds stress turbulence model was developed for flow through porous media. The results obtained in this previous work were used as a reference for calculations performed with an eddy-viscosity model. Representative validation cases such as channels with porous bottom are used to verify the new two-equation model, followed by investigation of the flow over the DLR-F15 airfoil with a porous segment at the trailing-edge, where porosity effects on lift and turbulent kinetic energy are evaluated. |
| Autor(en) | Semaan, Richard | El Sayed, Yosef | Sattler, Stephan | Sultana, Kaniz | Burnazzi, Marco | Scholz, Peter | Radespiel, Rolf |
|---|---|
| Titel | A Generalized Reduced-Order Model of Flow around an Airfoil with Circulation Control |
| Herausgeber | AIAA-2014-2517, 7th AIAA Flow Control Conference, 16-20 June, 2014, Atlanta, GA |
| Erscheinungsjahr | 2014 |
| Abstract | A low-dimensional generalized model is proposed for a flow around an airfoil with circulation control, describing natural vortex shedding and steady actuation. The suggested application range of the model extends from the un-actuated natural state to the strongly actuated near-steady state. The form of the dynamical system has been based on generalized mean-field consideration. Time resolved PIV snapshots are employed to derive the POD time coefficients and to calibrate the system parameters. The model is solely dependent on the actuation blowing momentum coefficient, and makes a good candidate for flow control applications. |