Airflow

Question 1

What is the coanda affect?
What are the conditions?

Answer 1

Gas travelling over a profiled surface will adhere to it and create a vacuum which pulls in air. Depletion of molecules create area of low pressure, flow moves towards area of low pressure.
Object is relatively streamlined and relatively shallow angle.

Question 2

What is the basic assumption of the question of continuity and Bernoulli’s theorem?

Answer 2

Air is an idea fluid

Question 3

Implications of air being an ideal fluid?

Answer 3

It is incompressible, density does not change and has no viscosity

Question 4

Above 300kts/mach 0.4 TSA, compressibility affects airflow. True or false?

Answer 4

True

Question 5

The equation of continuity

Answer 5

Mass can neither be created or destroyed.
Air mass flow entering a stream tube must be the same across all points.

Question 6

To keep the same mass flow, what happens at the narrow section of the Venturi?

Answer 6

Area decreases, velocity increases, pressure stays the same

Question 7

Bernoullis theorem

Answer 7

Energy can neither be created nor destroyed.

Question 8

Bernoullis principle

Answer 8

In a flow of idea fluid, the sum of static and dynamic pressure remains constant.

Question 9

In a Venturi where is the point of lowest static pressure?

Answer 9

At the narrow section and it has the highest dynamic pressure.