17.6.2. Coefficient of Drag (CD)

Try these first

1. 1.

   Define the coefficient of drag (CD).

   Hint

   Think about the dimensionality and significance of the term.

2. 2.

   What is the primary purpose of minimizing drag in engineering?

   Hint

   Consider the effect on energy consumption and speed.

3. 3.

   What does the coefficient of drag (CD) quantify?

   • The lift force
   • The drag force
   • The weight

   Hint

   Recall the context in which CD is used.

4. 4.

   True or False: A streamlined object has a higher CD compared to a blunt object.

   • True
   • False

   Hint

   Think about how air flows around objects.

5. 5.

   Evaluate the impact of different shapes on the drag coefficient of a sphere versus a cube when both are in the same fluid flow.

   Hint

   Consider how each shape interacts with fluid flow.

6. 6.

   Calculate the expected drag force on a wind turbine blade with a frontal area of 5 m² at a wind speed of 15 m/s and a CD of 0.4.

   Hint

   Make sure to apply the correct values into the drag formula.