A mixed-flow turbofan has a stagnation pressure upstream of the propu atmosphere where the ambient temperature is 219 K and the pressure turbine inlet temperature is 1500 K and the stagnation temperature of t

A mixed-flow turbofan has a stagnation pressure upstream of the propu atmosphere where the ambient temperature is 219 K and the pressure turbine inlet temperature is 1500 K and the stagnation temperature of t

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

A mixed-flow turbofan has a stagnation pressure upstream of the propulsive nozzle equal to 2 times inlet stagnation pressure when cruising at M = 0.85 through an
atmosphere where the ambient temperature is 219 K and the pressure is 24 kPa. The mass flow of air entering the engine is 140kg/s and the sfc is 0.7 kg hr-1kgf-1. The
turbine inlet temperature is 1500 K and the stagnation temperature of the jet is 700 K. The temperature and pressure of the flow through the nozzle may be assumed
uniform. Consider the engine is operated on a sea-level static test bed at the same non-dimensional condition. What is the ratio of gross thrust on the test bed to net thrust
at cruise?
4.046
2.118
3.8424
O 3.527

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