Airbus Concept Ingests Boundary Layer to Reduce Drag Boundary layer ingestion (BLI) promises a significant increase in fuel efficiency, but poses challenges in integrating propulsion and aerodynamics in a way that realizes the benefits while minimizing the penalties. In BLI, an aft-mounted propulsor ingests the slow-moving boundary-layer airflow over the fuselage and reenergizes the wake, improving propulsive efficiency and reducing drag. But the propulsor must be designed to operate in ...

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