Boundary layer ingestion Calculator

Boundary layer ingestion (BLI) refers to the concept in aerodynamics where an aircraft’s engine intakes are positioned close to the fuselage to ingest the slow-moving boundary layer air, which can improve propulsion efficiency. The formula for boundary layer thickness is given by:

Where:

  • is the boundary layer thickness,
  • is the distance along the surface,
  • is the Reynolds number at distance .

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