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Engineering · Mechanical Engineering
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a) Describe briefly the following terms related to a boundary layer (use a formula when appropriate) A. Displacement thickness B. Momentum thickness [4 Marks] b) What are laminar and turbulent flows? Explain their advantages and disad vantages with practical aerodynamic examples. [6 marks] c) An aircraft is flying at sea level with a velocity of 240 m/s. If we consider its wing as a rectangular flat plate of span 9.0 m and chord 2.5 m, calculate the boundary layer thickness at the wing trailing edge for: A. Entirely laminar flow B. Entirely turbulent flow (p 1.225 kg/m3, 1.8 x 105 kg/(m s), assume that the flow is incompressible) [6 marks] d) ith the help of appropriate sketches of the flow field, describe the phenom- enon of boundary layer separation. [4 marks]

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