Air enters the diffuser of a turbojet engine with a mass flow rate of 70 lb/s at 9 lbf/in2, 420°R, and a velocity of 750 ft/s. The pressure ratio for the compressor is 12, and its isentropic efficiency is 88%. Air enters the turbine at 2200°R with the same pressure as at the exit of the compressor. Air exits the nozzle at 9 lbf/in2. The diffuser operates isentropically and the nozzle and turbine have isentropic efficiencies of 92% and 90%, respectively. Use an air-standard analysis.1) the rate of heat addition, in Btu/h. 2) the pressure at the turbine exit, in psi. 3) the compressor power input, in Btu/h. 4) the velocity at the nozzle exit, in ft/s.

To given thatMass flow rate,m˙=70lb/spressure,P=70lbf/in2Temperature, T=420°RVelocity…

Answered: with a mass flow rate of 70 lb/s at 9…

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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Air enters the diffuser of a turbojet engine with a mass flow rate of 70 lb/s at 9 lbf/in², 420°R, and a velocity of 750 ft/s. The pressure ratio for the compressor is 12, and its isentropic efficiency is 88%. Air enters the turbine at 2200°R with the same pressure as at the exit of the compressor. Air exits the nozzle at 9 lbf/in². The diffuser operates isentropically and the nozzle and turbine have isentropic efficiencies of 92% and 90%, respectively. Use an air-standard analysis.

1) the rate of heat addition, in Btu/h.

2) the pressure at the turbine exit, in psi.

3) the compressor power input, in Btu/h.

4) the velocity at the nozzle exit, in ft/s.

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