104 kgs of air flows through a jet engine It enters at 95 ms

104 kg/s of air flows through a jet engine. It enters at 95 m/s and leaves at 540 m/s. The inlet pressure is -3.3 kPa gage and the exit pressure is 7.9 kPa gage. The inlet and exit areas are 2.70 m² and 2.20 m² respectively. The thrust provided by this engine is

a. 20 kN b. 81kN c. 46.3kN d. 72.6kN e. 111.2 kN

Solution

solution

thrust = m ( V₂ - V₁ )

= 104 ( 540 - 95 )

= 46.3 KN