Effects of Sideslip Direction on a Rear Fuselage Boundary Layer Ingesting Fan

Abstract Boundary layer ingestion (BLI) offers potential reductions in fuel burn and emissions. The propulsive fuselage concept features an aft fan that ingests the 360 deg boundary layer. A critical condition for this configuration occurs when a sideslip angle arises between aircraft longitudinal axis freestream velocity. flow combination with airframe generates inlet distortion depends on direction. In particular, increases into windward side of intake reduces opposite side, leading to either co-swirl or counter-swirl at face. This article investigates effect direction aerodynamics BLI fan. Experimental measurements have been taken low-speed rig representative total pressure swirl distortion. These tests complemented by full-annulus unsteady Reynolds-averaged Navier–Stokes simulations understand impact rotor outlet guide vane fields. results show positive (sideslip produces counter-swirl) work incidence, but additional losses are relatively small. However, negative lower loading, greater losses. stage loading was 28% higher efficiency 1.65% versus sideslip. case also found lose some operating range, equivalent 2% nozzle area. Overall, design tolerates well demonstrates importance coupling both aerodynamics.