M8.2 Airflow Fundamentals

What disrupts laminar flow over a wing?

• Smooth surfaces

• Surface distortions

• High pressure

• Low velocity

What is Free Stream Flow?

• The flow of air directly affected by the aircraft

• Fluid far enough away from a moving body unaffected by it

• The direction of airflow with respect to the object

• A region where the velocity of the relative airflow is zero

What type of boundary layer is more energetic and resists negative pressure gradients better?

• Laminar

• Turbulent

• Transitional

• Stationary

What is the role of stall warning devices in heavier aircraft?

• To increase speed

• To reduce drag

• To alert pilots of potential stalls

• To enhance lift

What happens when a wing stalls due to high pressure drag?

• It increases speed

• It increases lift

• It slows the aircraft and the stall increases

• It enhances fuel efficiency

What is the term for the airflow returning to its original state after passing over the aerofoil?

• Upwash

• Downwash

• Stagnation

• Vortex

What must be considered on a finite wingspan in addition to the bound vortex when considering the air flow around an aerofoil?

• Wing-tip vortices

• Leading edge vortices

• Trailing edge vortices

• Stagnation vortices

What is the span-wise element created by the pressure differential?

• Towards the root on the top surface of the wing

• Away from the root on the top surface of the wing

• Towards the tip on the upper surface of the wing

• Away from the tip on the lower surface of the wing

What is the primary function of winglets on an aircraft?

• To reduce wingtip vortices

• To decrease aircraft weight

• To increase fuel consumption

• To enhance passenger comfort

How does a turbulent boundary layer affect the drag on an aircraft?

• It increases drag

• It has no effect on drag

• It decreases drag

• It stabilizes drag