Configurational Aspects of a Circulation Controlled High-Lift System for a Mediurn-Haul Transport Aircraft

Abstract

Configurational aspects concerning the aerodynamics of a high-lift system with circulation control are investigated based on numerical investigations of two transport aircraft concepts. The two investigated concepts mainly differ in their engine type and position, vertical wing position, and wing sweep. The comparison of the two concepts indicate that all three aspects have a notable influence on the lift generation in landing configuration. A high wing position as well as an engine mounted in front of the main wing are both more favorable than a low wing position and an engine located behind the main wing in landing configuration. The wing sweep affects the lift generation as well as the stall behavior. The wing stall of the configuration with high positive wing sweep occurs due to flow separation in the outboard region, whereas the main wing of the configuration with low positive wing sweep stalls due to flow separation in the inboard region. The concept with engines mounted above the main wing trailing edge was furthermore investigated for intake flow distortion. While the landing configuration is uncritical concerning this matter, the take-off configuration reveals increasingly distorted intake flow with rising angle of attack.