Aktive Strömungskontrolle zur Steigerung der Leistungsfähigkeit von Außenflügeln
Buch in deiner Nähe kaufen
Beschreibung
2. Short version of the dissertation
Today’s transport aircraft wings are optimized substantially for cruise flight conditions. The major goal is to reduce the induced drag by thin wing extensions including wing tip devices. Especially winglets haven been proved to be very effective in respect to reduce the induced drag. However, it appears that these devices lead to a strong separated flow at the outer wing during take-off and thus the overall drag is noticeably increased. The consequences are larger engines, higher fuel consumption and as a result a higher MTOW. In the present work pneumatic vortex generators are used to control and delay the flow separation at high angles of attack.
In order to design the active flow control systems for the highly three-dimensional configuration, numerical flow analyses of an outer wing including the wind tunnel are carried out. A detailed description of the theoretical background of these simulations is given in chapter 2, whereas the turbulence modelling as well as Chimera technology are the essential building blocks for the comparability of the simulations.
Based on the results of the numerical flow simulation of the baseline flow (chapter 4), the design of the spanwise position of the pneumatic vortex generators is done. Various approaches of aligning and positioning of the actuators have been taken into account (Chapter 6).
Extensive investigations of different variants of the actuator system were carried out on a scaled and slightly modified model in the MUB (Chapter 7). The most efficient variant could be identified from these investigations. This was adapted for the DNW-NWB for an industry-relevant model and integrated into it. The results from the experiments in the DNW-NWB show that the efficiency of this model can also be increased (Chapter 8), but that the expectations from the MUB investigations have not been fulfilled (Chapter 9). The reasons for these differences were discussed in detail and are mainly due to the setup of the two experiments in the MUB and DNW-NWB.
Autor*in
Claus-Philipp Langhorst
Themen in »Aktive Strömungskontrolle zur Steigerung der Leistungsfähigkeit von Außenflügeln«
Aktive Strömungskontrolle Fluidische Wirbelgeneratoren Winglet