Question

QUESTION 1 (T1) What is an adverse pressure gradient? (9.2) A. Where pressure increases with distance downstream O B. Where pressure decreases with distance downstream C. Where pressure is uniform in the flow D. Where pressure is pushing the iow downstream QUESTION 2 (T2) Where does an adverse pressure gradient occur on an airfoil? (9.2) O A. Leading edge O B. Near or after the point of maximum thickness O C.Only in a region where the boundary layer is turbulent O D.Only in a region where the boundary layer is laminar QUESTION 3 (T3) What is pressure drag? (9.5) Drag due to skin friction Drag due to separation Drag due to turbulence QUESTION 4 (D1) In order for flow to separate, (9.3) O A the boundary layer must first have transitioned from a laminar boundary layer to turbulent boundary layer the boundary layer must first have transitioned from a turbulent boundary layer to laminar boundary layer the flow must be in a favorable pressure gradient the flow must be in an adverse pressure gradient the surface must be dimpled

Answer 1

Question 1)

The adverse pressure gradient is when pressure increases in the direction of flow

so correct option is first option

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Question 2)

This adverse pressure gradient occurs beyond the point of maximum thickness.

second option seems correct

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Question 3)

Pressure drag occurs when the flow separates from the surface. It is a drag due to separation.

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Question 4)

In order for flow to separate, the flow must be in adverse pressure gradient because then only pressure will start to reverse and flow will start to separate from the surface

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Question 5)

larger Reynolds number means flow is less viscous and is more turbulent means it has more inertia (momentum) than smaller reynolds number flow