In a gas turbine plant the air enters the compressor at 1 bar and 27◦C. The pressure leaving the compressor is 5 bar and the maximum temperature in the cycle is 850◦C. Compare the compressor work, turbine work, work ratio and cycle efficiency for the following two cases:
(i) the cycle is ideal
(ii) the cycle is actual with compressor efficiency of 80%, turbine efficiency of 85% and the pressure loss in the combustion chamber is 0.15 bar.
If in the above cycle the air expands in the turbine to such a pressure that the turbine work is just equal to compressor work, and further expansion of air upto atmospheric pressure takes place in a nozzle; calculate the velocity of air leaving the nozzle. Assume a nozzle efficiency of 90%. If an ideal regenerator is incorporated in the ideal cycle, what is the thermal efficiency of the cycle?
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