Engine Thrust Part 1-Thermodynamic Propulsion-Quiz, Exercises for Applied Thermodynamics. Aliah University
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senajit_9822 July 2012

Engine Thrust Part 1-Thermodynamic Propulsion-Quiz, Exercises for Applied Thermodynamics. Aliah University

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Prof. Jayashri Dutt took this quiz in class of Thermodynamic Propulsion course at Aliah University. It includes: Engine, Thrust, Airplane, Exhaust, Velocity, Relative, Constant, Acceleration, Forces, Mass, Flow
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q3.PDF

Chapter 2, Question 3: Engine Thrust

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The correct answer is 3) Thrust decreases

Since thrust = massflow ( uexit - uo). When the aircraft starts the takeoff roll uo=0 and at the end of the takeoff roll uo may be an appreciable fraction of uexit. Physically, what is happening is that relative to the engine the molecules coming in have ever increasing momentum and this acts counter to the momentum that the engine gives the molecules (the exit flow). In reference to the PRS question about "rock-breathing" propulsion, it is like having the person on the dock throw the rocks with greater and greater velocity (relative to the boat).

Class performance (2004):

Chapter 2, Question 3 Answer:

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Class performance (2003):

Class performance (2001):

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