Ian A. Waitz
Problem P1. (Unified Propulsion) L.O.Õs A & B
A single engine airplane is traveling in steady level flight at 400 m/s. The mass flow through the engine is 50 kg/s and the exhaust velocity is 700 m/s. A control volume is shown for the flow that passes through the engine. There is no flow across the boundaries of the control volume except as shown. The pressure around the engine control volume is 30 kPa except at the exhaust plane where the pressure is 25 kPa. The area of the exhaust plane is 1m2.
a) What is the momentum flux into the engine?
b) What is the momentum flux out of the engine?
c) What is the net momentum flux?
d) What is the net pressure force on the control volume?
e) What is the net force on the mass in the control volume?
f) In what direction does this force act?
g) What is the sum of all other forces on the aircraft?
