Aerodynamic Analysis of the Flying V Subsonic Transport to Enable Engine Integration

The Flying V is a flying-wing aircraft that has 20% less cruise drag than a modern tube-and-wing aircraft. The integration of the over-the-wing engine is not trivial due to the strong aerodynamic interaction between the wing and inlet. Prior to integrating the engine, the aerodynamics of the Flying V are studied with a Reynolds-averaged Navier-Stokes (RANS) solver using a finite volume mesh. Engine dimensions are sized through rubber sizing for the take-off thrust rating. The analysis focuses on the flow characteristics on the upper surface of the wing, particularly in the region where the engine could be located. Forces and pressure changes induced at different angles of attack and flight conditions are studied. Subsequently, the evolution of the boundary layer at different locations is analyzed to understand the flow that the engine would face at the inlet. For the defined inlet dimensions, the inlet distortion is evaluated at various locations on the wing. Preferred regions for engine placement and integration approaches are proposed and discussed to maximize the engine inlet performance at on-design and off-design conditions.