Numerical Investigation of Engine Effects on a Transport Aircraft with Circulation Control

Kurzfassung

The scope of this paper is to illustrate the installation effects of a turboprop engine on a high-lift configuration of a short take off and landing (STOL) aircraft with circulation control. In addition to the influence on the wing performance, the impact on the longitudinal static stability of the aircraft is also investigated. Furthermore, critical failure cases, namely one engine inoperative (OEI), as well as an asymmetric circulation control failure, are assessed. Therefore, steady CFD calculations based on the Reynolds-averaged Navier-Stokes (RANS) equations were performed. The propeller is modeled with an actuator disk approach. The results show strong potential of increasing lift by synergy effects between circulation control and propeller slipstream. However, the longitudinal stability and controllability are adversely affected. Regarding the case of OEI, the resulting yawing moments are twice as high as the actual yawing moments from the asymmetric thrust and therefore higher than expected.