What forces are exerted on the body by a fluid flow?

Lift force

Shear stress

Pressure force

Pressure and shear stress

Correct Answer : Pressure and shear stress

Explanation : When a body is kept in a stream of fluid flowing over it, there are two forces exerted. One is the pressure distribution and the other is the shear stress distribution. This leads to formation of lift or drag.

Recently Updated in Aerodynamics Questions

What is the thrust of an engine if the inlet and exhaust mass flow rate are 150 kg/s and 190 kg/s respectively with the pressure difference between the exhaust and ambient air is 1.85 × 10⁴? The exhaust area is 2m², the ambient and exhaust velocities are 280 m/s and 400 m/s.

50 kN

62 kN

71 kN

84 kN

Correct Answer : Option (C) : 71 kN

Explaination : Aerodynamics

The integral form of the conservative equation is used for computing thrust of an engine.

True

False

Can Not Say

None of the above

Correct Answer : Option (A) : True

Explanation : The integral form of conservative equation finds use in many practical scenarios such as finding thrust of a jet propulsion device – engine. It can be used to find out the thrust of turbojet, turboprop, ramjet, turbofan, rocket engine and many more.

Integral form of momentum equation cannot replace the need for theoretical and experimental measurements.

True

False

Can Not Say

None of the above

Correct Answer : Option (B) : False

Explanation : In real life scenario, computing the thrust of the jet engine using theoretical and experimental results can be very exhaustive. The data obtained is not just extensive but also complex. Thus, to replace this, an integral form of momentum equation is used which gives the result much more accurately.