Q2. An open cycle gas turbine plant is shown in Fig Q2 Air enters with an initial pressure and temperature of 1.0 bar and 15℃ respectively and is compressed to a pressure of 9 bar.
The combustion products enter the high-pressure stage at a pressure and temperature of 9 bar and 927℃ respectively.
The turbine expands the gas in two stages of equal pressure ratio to the initial pressure.
The gas is reheated to 927℃ between the turbine stages. The compressor has an isentropic efficiency of 0.85. Each turbine stage has an isentropic efficiency of 0.88.
The mass flow of fuel and system losses may be ignored.
(a) Calculate EACH of the following:
(i) The work ratio; (8)
(ii) The Thermal efficiency; (4)
(b) Sketch the cycle on a Temperature-specific entropy diagram. (4)
Note: for air γ = 1.4 and cp = 1.005 kJ⁄(kg K)
for combustion gas γ = 1.33 and cp = 1.15 kJ⁄(kg K)
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