Q2. An open cycle gas turbine plant with a regenerator is shown in Fig Q2. The air enters the compressor at a pressure and temperature of 1 bar and 17℃ respectively. It is then compressed with an isentropic efficiency of 0.82 to a pressure of 6 bar. The combustion gas enters the turbine at a temperature of 827℃ and is expanded with an isentropic efficiency of 0.88 to a pressure of 1 bar.
The regenerator is fitted with a bypass and may be considered as a perfect heat exchanger. The mass flow of fuel and other system losses may be ignored.
(a) Calculate EACH of the following:
(i) The specific net-work output; (6)
(ii) The decrease in thermal efficiency when the regenerator is fully bypassed. (6)
(b) Sketch the cycle on a Temperature-specific entropy diagram showing the effect of the regenerator. (4)
Note: For air γ = 1.4, CP = 1.005 kJ⁄(kg K)
For gas γ = 1.33, CP = 1.15 kJ⁄(kg K)
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