In a station 3 meters downstream a flat plate, the boundary layer thickness was measured and found to be 7 cm. If this boundary layer is the result of a parallel flow of air at room temperature at a speed of 5 m/s, is the boundary layer turbulent or laminar?

Question 1

In a station 3 meters downstream a flat plate, the boundary layer thickness was measured and found to be 7 cm. If this boundary layer is the result of a parallel flow of air at room temperature at a speed of 5 m/s, is the boundary layer turbulent or laminar? what is the characteristic velocity scale and Kolmogorov length scale at this station?

Question 2

The jet engine of a commercial airplane produces 50 KN of thrust in preparation for take – off. The engine is 4 meters above the ground and has an exhaust diameter of 1 meter. What is the minimum distance for a man to stand behind the engine so that he would not encounter gusts greater than 10 m/s? (mean plus fluctuations). For simplicity, assume ambient air density at the exhaust of the engine. Also, assume the maximum fluctuating axial velocity less than three times the r.m.s velocity.

"Get 15% discount on your first 3 orders with us"
Use the following coupon
FIRST15

Order Now