A2 Handout (add-on).pdf - A2 Handout(add-on Boundary-layer...

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A2 Handout (add-on) Boundary-layer control techniques (and how they work?): 1. Streamlining 2. Global surface roughening 3. Local surface roughening/roughness 4. Body rotation/spinning 5. Wall suction and injection 6. 7. Others………
Q/A: Why does the brown pelican fly close to the water surface? i.e., Discuss the advantages (e.g., improved L/D but how and why?) and disadvantages?
Why there is a lift enhancement in ground effect? Why there is a lift-induced drag reduction in ground effect? L/D increment in ground effect compared to the wing flying out-of-ground effect?

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