Discussion
A boundary layer diverter is fitted to a fuselage-side inlet to
Answer: A
Correct answer: Keep boundary layer out of the inlet
Air flowing along the fuselage ahead of a side-mounted inlet forms a boundary layer that is thick, low in energy and turbulent. Ingesting it lowers the pressure recovery and, worse, delivers badly distorted flow to the compressor face, which can provoke surge.
A diverter is a wedge or a gap that holds the inlet clear of the fuselage surface so the boundary layer passes outside it. The cost is extra frontal area and drag, which is exactly why the arrangement is avoided where a podded installation is possible.
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