b) A gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and the turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1250 K. The compressor and the turbine efficiencies are 80% and 82%, respectively, and the effectiveness of the regenerator is 74%. Assuming variable specific heats for air; i. show the process in a T-s diagram; ii. calculate the back work ratio; and iii. determine the thermal efficiency of the cycle.

b) A gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and the turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1250 K. The compressor and the turbine efficiencies are 80% and 82%, respectively, and the effectiveness of the regenerator is 74%. Assuming variable specific heats for air; i. show the process in a T-s diagram; ii. calculate the back work ratio; and iii. determine the thermal efficiency of the cycle.

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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Concept explainers

Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.

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(b) A gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the
compressor and the turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1250 K. The compressor and the turbine
efficiencies are 80% and 82%, respectively, and the effectiveness of the regenerator is 74%. Assuming variable specific heats for air;
i. show the process in a T-s diagram;
ii. calculate the back work ratio; and
iii. determine the thermal efficiency of the cycle.

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