Intake Design and Airframe Integration Sensitivities for an Embedded Over-The-Wing Mounted Ultra-High Bypass Ratio Turbofan

Within the Collaborative Research Centre 880, future technologies are to be developed for the application on a cruise-efficient transport aircraft. Part of this concept is to mount the aircraft engines on the rear part of the wing. This installation position might hold the potential to accommodate aircraft engines with growing engine diameters. Moreover, a synergy between wing and nacelle might lead to a short nacelle design which becomes crucial for increasing bypass ratios. To enhance the coupling between airframe and nacelle, the engine will be partly embedded into the wing. A preliminary design of an embedded ultra-high bypass ratio engine was investigated at high speed conditions. The axial position of the engine was varied at constant lift showing that aircraft performance improves by shifting the nacelle axially downstream. In addition, studies on intake parameter variations for a generic embedded configuration are discussed.