Aerodynamic Analysis of a STOL Propeller Aircraft with Active High-Lift and Control Surface Systems

Kurzfassung

The aerodynamic properties of a state-of-the-art short take-off and landing aircraft design with circulation control and slipstream deflection in landing configuration have been investigated via RANS simulations. The present paper summarizes the findings concerning one engine inoperative conditions (OEI), active control surface design, and ground effect. It is shown that the unfavorable aircraft’s aerodynamic characteristics under OEI conditions, including a degraded maximum lift coefficient and extraordinarily high yawing moments, can be improved via passive measures, such as nacelle strakes and tail fences. The resulting requirements for lateral control forces can be fulfilled by the use of circulation controlled rudder and ailerons. Simulations of the 3D configuration in ground proximity yield a beneficial effect on the lift coefficient despite contrary indications from 2D computations. Furthermore, the simulations show a significant pitch down tendency due to ground proximity.